s49？磁盘存储文件系统管理详解（磁盘存储管理）不看后悔

目录第一部分1、创建一个2G的文件系统2、写一个脚本，完成如下功能3、配置为yum源第二部分 RAID1、创建一个可用空间为1G的RAID设备2、创建由三块硬盘组成的可用空间为2G的RAID5设备第三部分 LVM1、创建一个至少有两个PV组成的大小为20G的名为testvg的VG；2、新建用户archlinux3、扩展testlv至7G4、收缩testlv至3G5、对testlv创建快照6、删除逻辑卷、卷组、物理卷

#新添加一块10G磁盘
[root@centos8 ~]# scandisk
[root@centos8 ~]# alias scandisk
alias scandisk=’echo ‘\”- – -‘\” > /sys/class/scsi_host/host0/scan;echo ‘\”- – -‘\” > /sys/class/scsi_host/host1/scan;echo ‘\”- – -‘\” > /sys/class/scsi_host/host2/scan’
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part
sdb 8:16 0 20G 0 disk
├─sdb1 8:17 0 1G 0 part /mnt/sdb1
├─sdb2 8:18 0 2G 0 part
├─sdb3 8:19 0 1K 0 part
└─sdb5 8:21 0 3G 0 part
sdc 8:32 0 10G 0 disk
├─sdc1 8:33 0 1G 0 part
└─sdc2 8:34 0 2G 0 part
sdd 8:48 0 10G 0 disk #这个是新添加的磁盘
sr0 11:0 1 7.7G 0 rom
nvme0n1 259:0 0 5G 0 disk
[root@centos8 ~]# fdisk /dev/sdd
Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x0712eaa0.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-20971519, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-20971519, default 20971519): +2G
Created a new partition 1 of type ‘Linux’ and of size 2 GiB.
Command (m for help): p
Disk /dev/sdd: 10 GiB, 10737418240 bytes, 20971520 sectors
Units: sectors of 1 * 512=512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0712eaa0
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 4196351 4194304 2G 83 Linux
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part
sdb 8:16 0 20G 0 disk
├─sdb1 8:17 0 1G 0 part /mnt/sdb1
├─sdb2 8:18 0 2G 0 part
├─sdb3 8:19 0 1K 0 part
└─sdb5 8:21 0 3G 0 part
sdc 8:32 0 10G 0 disk
├─sdc1 8:33 0 1G 0 part
└─sdc2 8:34 0 2G 0 part
sdd 8:48 0 10G 0 disk
└─sdd1 8:49 0 2G 0 part #新建的分区
sr0 11:0 1 7.7G 0 rom
nvme0n1 259:0 0 5G 0 disk
[root@centos8 ~]# mkfs.ext4 -b 2048 -m 1 -L TEST /dev/sdd1 #-b 2048 块大小为2048byte -m 1 预留1% -L TEST 卷标名为TEST
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 1048576 2k blocks and 131072 inodes
Filesystem UUID: 0f8a2804-a927-4cde-9d3c-8066d7148386
Superblock backups stored on blocks:
16384, 49152, 81920, 114688, 147456, 409600, 442368, 802816
Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos8 ~]# tune2fs -l /dev/sdd1
tune2fs 1.45.4 (23-Sep-2019)
Filesystem volume name: TEST #卷标名为TEST。
Last mounted on: <not available>
Filesystem UUID: 0f8a2804-a927-4cde-9d3c-8066d7148386
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl #centos8 ext4文件系统，默认就有acl功能，不需要单独设置
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 131072
Block count: 1048576
Reserved block count: 10485 #预留块大小
Free blocks: 1011035
Free inodes: 131061
First block: 0
Block size: 2048 #块大小为2048。
Fragment size: 2048
Group descriptor size: 64
Reserved GDT blocks: 512
Blocks per group: 16384
Fragments per group: 16384
Inodes per group: 2048
Inode blocks per group: 256
Flex block group size: 16
Filesystem created: Thu Dec 3 22:58:44 2020
Last mount time: n/a
Last write time: Thu Dec 3 22:58:44 2020
Mount count: 0
Maximum mount count: -1
Last checked: Thu Dec 3 22:58:44 2020
Check interval: 0 (<none>)
Lifetime writes: 1058 kB
Reserved blocks uid: 0 (user root) #预留给谁使用，root。
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 32
Desired extra isize: 32
Journal inode: 8
Default directory hash: half_md4
Directory Hash Seed: c99589a0-f6eb-4dd6-a178-b4113c273353
Journal backup: inode blocks
Checksum type: crc32c
Checksum: 0xc13d6cca
[root@centos8 ~]# mkdir /test #创建挂载目录
[root@centos8 ~]# blkid /dev/sdd1 #查看UUID和文件系统类型
/dev/sdd1: LABEL=”TEST” UUID=”0f8a2804-a927-4cde-9d3c-8066d7148386″ TYPE=”ext4″ PARTUUID=”0712eaa0-01″
[root@centos8 ~]# vim /etc/fstab
#添加下面行
UUID=0f8a2804-a927-4cde-9d3c-8066d7148386 /test ext4 defaults 0 0
:wq
[root@centos8 ~]# mount -a #自动挂载
[root@centos8 ~]# mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,size=905164k,nr_inodes=226291,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/rdma type cgroup (rw,nosuid,nodev,noexec,relatime,rdma)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/sda2 on / type xfs (rw,relatime,attr2,inode64,noquota)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=23440)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
mqueue on /dev/mqueue type mqueue (rw,relatime)
/dev/sda3 on /data type xfs (rw,relatime,attr2,inode64,noquota)
/dev/sda1 on /boot type ext4 (rw,relatime)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=184384k,mode=700)
/dev/sdb1 on /mnt/sdb1 type ext4 (rw,noatime,nodiratime)
/dev/sdd1 on /test type ext4 (rw,relatime) #已经挂载
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part
sdb 8:16 0 20G 0 disk
├─sdb1 8:17 0 1G 0 part /mnt/sdb1
├─sdb2 8:18 0 2G 0 part
├─sdb3 8:19 0 1K 0 part
└─sdb5 8:21 0 3G 0 part
sdc 8:32 0 10G 0 disk
├─sdc1 8:33 0 1G 0 part
└─sdc2 8:34 0 2G 0 part
sdd 8:48 0 10G 0 disk
└─sdd1 8:49 0 2G 0 part /test #已经挂载
sr0 11:0 1 7.7G 0 rom
nvme0n1 259:0 0 5G 0 disk
[root@centos8 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 905164 0 905164 0% /dev
tmpfs 921932 0 921932 0% /dev/shm
tmpfs 921932 8940 912992 1% /run
tmpfs 921932 0 921932 0% /sys/fs/cgroup
/dev/sda2 104806400 2152664 102653736 3% /
/dev/sda3 52403200 398448 52004752 1% /data
/dev/sda1 999320 137644 792864 15% /boot
tmpfs 184384 0 184384 0% /run/user/0
/dev/sdb1 1031836 2821 972491 1% /mnt/sdb1
/dev/sdd1 2031306 9236 1992908 1% /test
#已经挂载

[root@centos8 ~]# vim disk_used.sh
#!/bin/bash
#
#**********************************************************************************************
#Author: Raymond
#QQ: 88563128
#Date: 2020-12-04
#FileName: disk_used.sh
#URL: raymond.blog.csdn.net
#Description: The test script
#Copyright (C): 2021 All rights reserved
#*********************************************************************************************
disk=`lsblk | sed -nr ‘s/(^sd[[:lower:]]).*/\1/p’`
disk_num=`lsblk | sed -nr ‘s/(^sd[[:lower:]]).*/\1/p’| wc -l`
disk_end=`lsblk | sed -nr ‘s/(^sd[[:lower:]]).*/\1/p’ | sed -n ‘$p’`
if [ $disk_num -eq 1 ];then
df | grep “/dev/$disk”
else
df | grep “/dev/$disk_end”
fi
:wq
[root@centos8 ~]# bash disk_used.sh
/dev/sda2 104806400 4868684 99937716 5% /
/dev/sda3 52403200 398400 52004800 1% /data
/dev/sda1 999320 192580 737928 21% /boot
#添加两块硬盘
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 5G 0 disk
sdc 8:32 0 5G 0 disk
sr0 11:0 1 7.7G 0 rom
[root@centos8 ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x2e83806e.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-10485759, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-10485759, default 10485759): +2G
Created a new partition 1 of type ‘Linux’ and of size 2 GiB.
Command (m for help): p
Disk /dev/sdb: 5 GiB, 5368709120 bytes, 10485760 sectors
Units: sectors of 1 * 512=512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x2e83806e
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 4196351 4194304 2G 83 Linux
Command (m for help): n
Partition type
p primary (1 primary, 0 extended, 3 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (2-4, default 2):
First sector (4196352-10485759, default 4196352):
Last sector, +sectors or +size{K,M,G,T,P} (4196352-10485759, default 10485759):
Created a new partition 2 of type ‘Linux’ and of size 3 GiB.
Command (m for help): p
Disk /dev/sdb: 5 GiB, 5368709120 bytes, 10485760 sectors
Units: sectors of 1 * 512=512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x2e83806e
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 4196351 4194304 2G 83 Linux
/dev/sdb2 4196352 10485759 6289408 3G 83 Linux
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 5G 0 disk
├─sdb1 8:17 0 2G 0 part
└─sdb2 8:18 0 3G 0 part
sdc 8:32 0 5G 0 disk
sr0 11:0 1 7.7G 0 rom
[root@centos8 ~]# mkfs.ext4 /dev/sdb1
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 524288 4k blocks and 131072 inodes
Filesystem UUID: c520fbef-2726-4ab2-b54f-b654bd6c6a1f
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos8 ~]# mkfs.ext4 /dev/sdb2
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 786176 4k blocks and 196608 inodes
Filesystem UUID: b5efe116-aec1-41e7-80a2-3791b3ee5669
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos8 ~]# mkdir /mnt/sdb{1,2}
[root@centos8 ~]# mount /dev/sdb1 /mnt/sdb1
[root@centos8 ~]# mount /dev/sdb2 /mnt/sdb2
[root@centos8 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 893740 0 893740 0% /dev
tmpfs 921916 0 921916 0% /dev/shm
tmpfs 921916 9528 912388 2% /run
tmpfs 921916 0 921916 0% /sys/fs/cgroup
/dev/sda2 104806400 4868932 99937468 5% /
/dev/sda3 52403200 398400 52004800 1% /data
/dev/sda1 999320 192580 737928 21% /boot
tmpfs 184380 1168 183212 1% /run/user/42
tmpfs 184380 4 184376 1% /run/user/0
/dev/sdb1 1998672 6144 1871288 1% /mnt/sdb1
/dev/sdb2 3029776 9216 2846944 1% /mnt/sdb2
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 5G 0 disk
├─sdb1 8:17 0 2G 0 part /mnt/sdb1
└─sdb2 8:18 0 3G 0 part /mnt/sdb2
sdc 8:32 0 5G 0 disk
sr0 11:0 1 7.7G 0 rom
[root@centos8 ~]# fdisk /dev/sdc
Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x2885d32c.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-10485759, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-10485759, default 10485759): +3G
Created a new partition 1 of type ‘Linux’ and of size 3 GiB.
Command (m for help): p
Disk /dev/sdc: 5 GiB, 5368709120 bytes, 10485760 sectors
Units: sectors of 1 * 512=512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x2885d32c
Device Boot Start End Sectors Size Id Type
/dev/sdc1 2048 6293503 6291456 3G 83 Linux
Command (m for help): n
Partition type
p primary (1 primary, 0 extended, 3 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (2-4, default 2):
First sector (6293504-10485759, default 6293504):
Last sector, +sectors or +size{K,M,G,T,P} (6293504-10485759, default 10485759):
Created a new partition 2 of type ‘Linux’ and of size 2 GiB.
Command (m for help): p
Disk /dev/sdc: 5 GiB, 5368709120 bytes, 10485760 sectors
Units: sectors of 1 * 512=512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x2885d32c
Device Boot Start End Sectors Size Id Type
/dev/sdc1 2048 6293503 6291456 3G 83 Linux
/dev/sdc2 6293504 10485759 4192256 2G 83 Linux
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 5G 0 disk
├─sdb1 8:17 0 2G 0 part /mnt/sdb1
└─sdb2 8:18 0 3G 0 part /mnt/sdb2
sdc 8:32 0 5G 0 disk
├─sdc1 8:33 0 3G 0 part
└─sdc2 8:34 0 2G 0 part
sr0 11:0 1 7.7G 0 rom
[root@centos8 ~]# mkfs.ext4 /dev/sdc1
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 786432 4k blocks and 196608 inodes
Filesystem UUID: e4eac13f-f7aa-4cb1-9c72-d492f16231b9
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos8 ~]# mkfs.ext4 /dev/sdc2
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 524032 4k blocks and 131072 inodes
Filesystem UUID: 91996752-51a6-42c3-9398-fdc9c58aa39f
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos8 ~]# mkdir /mnt/sdc{1,2}
[root@centos8 ~]# mount /dev/sdc1 /mnt/sdc1
[root@centos8 ~]# mount /dev/sdc2 /mnt/sdc2
[root@centos8 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 893740 0 893740 0% /dev
tmpfs 921916 0 921916 0% /dev/shm
tmpfs 921916 9536 912380 2% /run
tmpfs 921916 0 921916 0% /sys/fs/cgroup
/dev/sda2 104806400 4868932 99937468 5% /
/dev/sda3 52403200 398400 52004800 1% /data
/dev/sda1 999320 192580 737928 21% /boot
tmpfs 184380 1168 183212 1% /run/user/42
tmpfs 184380 4 184376 1% /run/user/0
/dev/sdb1 1998672 6144 1871288 1% /mnt/sdb1
/dev/sdb2 3029776 9216 2846944 1% /mnt/sdb2
/dev/sdc1 3030800 9216 2847916 1% /mnt/sdc1
/dev/sdc2 2030416 6144 1903084 1% /mnt/sdc2
[root@centos8 ~]# bash disk_used.sh
/dev/sdc1 3030800 9216 2847916 1% /mnt/sdc1
/dev/sdc2 2030416 6144 1903084 1% /mnt/sdc2

[root@centos6 ~]# mkdir /mnt/iso #创建复制DVD1和DVD2的目录
[root@centos6 ~]# mkdir /mnt/dvd1 #创建挂载DVD1的目录
[root@centos6 ~]# mkdir /mnt/dvd2 #创建挂载DVD2的目录
[root@centos6 ~]# mount /dev/sr0 /mnt/dvd1 #挂载DVD1
mount: block device /dev/sr0 is write-protected, mounting read-only
[root@centos6 ~]# mount /dev/sr1 /mnt/dvd2 #挂载DVD2
mount: block device /dev/sr1 is write-protected, mounting read-only
[root@centos6 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 100902304 853756 94916260 1% /
tmpfs 501508 0 501508 0% /dev/shm
/dev/sda1 999320 30712 916180 4% /boot
/dev/sda3 51475068 53064 48800564 1% /data
/dev/sr0 3897932 3897932 0 100% /mnt/dvd1
/dev/sr1 2136278 2136278 0 100% /mnt/dvd2
[root@centos6 ~]# ls /mnt/dvd1
CentOS_BuildTag images repodata RPM-GPG-KEY-CentOS-Testing-6
EFI isolinux RPM-GPG-KEY-CentOS-6 TRANS.TBL
EULA Packages RPM-GPG-KEY-CentOS-Debug-6
GPL RELEASE-NOTES-en-US.html RPM-GPG-KEY-CentOS-Security-6
[root@centos6 ~]# ls /mnt/dvd2
CentOS_BuildTag Packages RPM-GPG-KEY-CentOS-Debug-6 RPM-GPG-KEY-CentOS-Testing-6
EULA RPM-GPG-KEY-CentOS-6 RPM-GPG-KEY-CentOS-Security-6 TRANS.TBL
[root@centos6 ~]# cp -av /mnt/dvd1/* /mnt/iso #把DVD1复制到/mnt/iso目录
[root@centos6 ~]# cp -v /mnt/dvd2/Packages/*.rpm /mnt/iso/Packages/ #复制DVD2到/mnt/iso
#合并TRANS.TBL
#将DVD2中TRANS.TBL的信息追加到DVD1中TRANS.TBL后面, 并排序保存
[root@centos6 ~]# cat /mnt/dvd2/Packages/TRANS.TBL >> /mnt/iso/Packages/TRANS.TBL
[root@centos6 ~]# mv /mnt/iso/Packages/{TRANS.TBL,TRANS.TBL.BAK}
[root@centos6 ~]# sort /mnt/iso/Packages/TRANS.TBL.BAK > /mnt/iso/Packages/TRANS.TBL
[root@centos6 ~]# rm -rf /mnt/iso/Packages/TRANS.TBL.BAK
#/mnt/iso已经是合并后的文件了
[root@centos6 ~]# du -sh /mnt/iso
5.9G /mnt/iso
[root@centos6 ~]# mkdir /data/iso #创建iso文件目录
[root@centos6 ~]# yum -y install mkisofs #安装创建ISO文件工具
[root@centos6 ~]# mkisofs -l -J -L -r -V “CentOS-6.10-x86_64-Everything” -o /data/iso/CentOS-6.10-x86_64-Everything.iso /mnt/iso #创建ISO文件
[root@centos6 ~]# ll -h /data/iso
total 5.8G
-rw-r–r– 1 root root 5.8G Dec 4 01:38 CentOS-6.10-x86_64-Everything.iso

#关机移除新添加的光驱，把/dev/sr0挂载成CentOS-6.10-x86_64-Everything.iso
[root@centos6 ~]# yum -y install autofs #安装自动挂载光盘工具
[root@centos6 ~]# service autofs start;chkconfig autofs on #启动autofs服务，并开机启动
Loading autofs4: [ OK ]
Starting automount: [ OK ]
[root@centos6 ~]# ls /misc
[root@centos6 ~]# ls /misc/cd
CentOS_BuildTag images RELEASE-NOTES-en-US.html RPM-GPG-KEY-CentOS-Security-6
EFI isolinux repodata RPM-GPG-KEY-CentOS-Testing-6
EULA lost+found RPM-GPG-KEY-CentOS-6 TRANS.TBL
GPL Packages RPM-GPG-KEY-CentOS-Debug-6
[root@centos6 ~]# vim /etc/yum.repos.d/test.repo #设置光盘镜像本地源
[base]
name=base
baseurl=file:///misc/cd
checkgpg=0
:wq
[root@centos6 ~]# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
base | 4.0 kB 00:00 …
repo id repo name status
base base 6,713
repolist: 6,713

#先设置光驱加载CentOS-6.10-x86_64-bin-DVD1.iso
[root@centos6 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 3.7G 0 rom
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 97.7G 0 part /
├─sda3 8:3 0 48.8G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 2G 0 part [SWAP]
[root@centos6 ~]# dd if=/dev/sr0 bs=1M of=CentOS-6.10-x86_64-Everything.iso
3807+0 records in
3807+0 records out
3991928832 bytes (4.0 GB) copied, 271.833 s, 14.7 MB/s
[root@centos6 ~]# ll CentOS-6.10-x86_64-Everything.iso -h
-rw-r–r– 1 root root 3.8G Dec 4 18:50 CentOS-6.10-x86_64-Everything.iso
#把光驱断开连接，设置光驱加载CentOS-6.10-x86_64-bin-DVD2.iso，再连接光驱
[root@centos6 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 2G 0 rom
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 97.7G 0 part /
├─sda3 8:3 0 48.8G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 2G 0 part [SWAP]
[root@centos6 ~]# dd if=/dev/sr0 ibs=1k skip=32 of=CentOS-6.10-x86_64-Everything.iso obs=1M seek=3788
#skip=32参考的ISO9660文件头，seek=3788，跳过上个镜像的大小。
2136246+0 records in
2086+1 records out
2187515904 bytes (2.2 GB) copied, 154.047 s, 14.2 MB/s
[root@centos6 ~]# ll -h CentOS-6.10-x86_64-Everything.iso
-rw-r–r– 1 root root 5.8G Dec 4 18:56 CentOS-6.10-x86_64-Everything.iso

#把光驱断开连接，设置CentOS-6.10-x86_64-Everything.iso,再连接光驱
[root@centos6 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 5.8G 0 rom
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 97.7G 0 part /
├─sda3 8:3 0 48.8G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 2G 0 part [SWAP]
[root@centos6 ~]# yum -y install autofs #安装自动挂载光盘工具
[root@centos6 ~]# service autofs start;chkconfig autofs on #启动autofs服务，并开机启动
Loading autofs4: [ OK ]
Starting automount: [ OK ]
[root@centos6 ~]# ls /misc
[root@centos6 ~]# ls /misc/cd
CentOS_BuildTag images RELEASE-NOTES-en-US.html RPM-GPG-KEY-CentOS-Security-6
EFI isolinux repodata RPM-GPG-KEY-CentOS-Testing-6
EULA lost+found RPM-GPG-KEY-CentOS-6 TRANS.TBL
GPL Packages RPM-GPG-KEY-CentOS-Debug-6
[root@centos6 ~]# vim /etc/yum.repos.d/test.repo #设置光盘镜像本地源
[base]
name=base
baseurl=file:///misc/cd
checkgpg=0
:wq
[root@centos6 ~]# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
base | 4.0 kB 00:00 …
repo id repo name status
base base 6,713
repolist: 6,713

[root@centos8 ~]# scandisk
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 1G 0 disk
sdc 8:32 0 1G 0 disk
sdd 8:48 0 1G 0 disk
sr0 11:0 1 7.7G 0 rom
#添加三块新硬盘/dev/sdb、/dev/sdc和/dev/sdd
[root@centos8 ~]# dnf -y install mdadm
[root@centos8 ~]# mdadm -C /dev/md0 -a yes -l 1 -n 2 -x 1 /dev/sd{b,c,d}
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store ‘/boot’ on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
–metadata=0.90
Continue creating array? (y/n) y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 1G 0 disk
└─md0 9:0 0 1022M 0 raid1
sdc 8:32 0 1G 0 disk
└─md0 9:0 0 1022M 0 raid1
sdd 8:48 0 1G 0 disk
└─md0 9:0 0 1022M 0 raid1
sr0 11:0 1 7.7G 0 rom
[root@centos8 ~]# mkfs.ext4 /dev/md0
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 261632 4k blocks and 65408 inodes
Filesystem UUID: 5540936f-bfe4-46ff-8fbb-88e071f5499a
Superblock backups stored on blocks:
32768, 98304, 163840, 229376
Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos8 ~]# tune2fs -l /dev/md0
tune2fs 1.45.4 (23-Sep-2019)
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 5540936f-bfe4-46ff-8fbb-88e071f5499a
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 65408
Block count: 261632
Reserved block count: 13081
Free blocks: 252781
Free inodes: 65397
First block: 0
Block size: 4096
Fragment size: 4096
Group descriptor size: 64
Reserved GDT blocks: 127
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8176
Inode blocks per group: 511
Flex block group size: 16
Filesystem created: Fri Dec 4 16:56:44 2020
Last mount time: n/a
Last write time: Fri Dec 4 16:56:44 2020
Mount count: 0
Maximum mount count: -1
Last checked: Fri Dec 4 16:56:44 2020
Check interval: 0 (<none>)
Lifetime writes: 533 kB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 32
Desired extra isize: 32
Journal inode: 8
Default directory hash: half_md4
Directory Hash Seed: d8599d77-afd5-4e2f-80c6-f206e7dc2bab
Journal backup: inode blocks
Checksum type: crc32c
Checksum: 0x066b1a44
[root@centos8 ~]# mkdir /backup
[root@centos8 ~]# blkid /dev/md0
/dev/md0: UUID=”5540936f-bfe4-46ff-8fbb-88e071f5499a” TYPE=”ext4″
[root@centos8 ~]# vim /etc/fstab
#添加下面内容
UUID=5540936f-bfe4-46ff-8fbb-88e071f5499a /backup ext4 defaults 0 0
:wq
[root@centos8 ~]# mount -a
[root@centos8 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 884M 0 884M 0% /dev
tmpfs 901M 0 901M 0% /dev/shm
tmpfs 901M 8.7M 892M 1% /run
tmpfs 901M 0 901M 0% /sys/fs/cgroup
/dev/sda2 100G 2.1G 98G 3% /
/dev/sda3 50G 390M 50G 1% /data
/dev/sda1 976M 135M 775M 15% /boot
tmpfs 181M 0 181M 0% /run/user/0
/dev/md0 990M 2.6M 921M 1% /backup
[root@centos8 ~]# reboot
[root@centos8 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 884M 0 884M 0% /dev
tmpfs 901M 0 901M 0% /dev/shm
tmpfs 901M 8.7M 892M 1% /run
tmpfs 901M 0 901M 0% /sys/fs/cgroup
/dev/sda2 100G 2.1G 98G 3% /
/dev/sda3 50G 390M 50G 1% /data
/dev/sda1 976M 135M 775M 15% /boot
/dev/md0 990M 2.6M 921M 1% /backup
tmpfs 181M 0 181M 0% /run/user/0
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 1G 0 disk
└─md0 9:0 0 1022M 0 raid1 /backup
sdc 8:32 0 1G 0 disk
└─md0 9:0 0 1022M 0 raid1 /backup
sdd 8:48 0 1G 0 disk
└─md0 9:0 0 1022M 0 raid1 /backup
sr0 11:0 1 7.7G 0 rom

[root@centos8 ~]# scandisk
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 1G 0 disk
sdc 8:32 0 1G 0 disk
sdd 8:48 0 1G 0 disk
sr0 11:0 1 7.7G 0 rom
#添加三块新硬盘/dev/sdb、/dev/sdc和/dev/sdd
[root@centos8 ~]# dnf -y install mdadm
[root@centos8 ~]# mdadm -C /dev/md1 -a yes -l 5 -n 3 -c 256 /dev/sd{b,c,d}
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md1 started.
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 1G 0 disk
└─md1 9:1 0 2G 0 raid5
sdc 8:32 0 1G 0 disk
└─md1 9:1 0 2G 0 raid5
sdd 8:48 0 1G 0 disk
└─md1 9:1 0 2G 0 raid5
sr0 11:0 1 7.7G 0 rom
[root@centos8 ~]# mkfs.ext4 /dev/md1
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 523264 4k blocks and 130816 inodes
Filesystem UUID: d4447cca-1a84-44c3-b3f6-9a7956091233
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos8 ~]# tune2fs -l /dev/md1
tune2fs 1.45.4 (23-Sep-2019)
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: d4447cca-1a84-44c3-b3f6-9a7956091233
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 130816
Block count: 523264
Reserved block count: 26163
Free blocks: 505316
Free inodes: 130805
First block: 0
Block size: 4096
Fragment size: 4096
Group descriptor size: 64
Reserved GDT blocks: 255
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8176
Inode blocks per group: 511
RAID stride: 64
RAID stripe width: 128
Flex block group size: 16
Filesystem created: Fri Dec 4 17:24:39 2020
Last mount time: n/a
Last write time: Fri Dec 4 17:24:40 2020
Mount count: 0
Maximum mount count: -1
Last checked: Fri Dec 4 17:24:39 2020
Check interval: 0 (<none>)
Lifetime writes: 1045 kB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 32
Desired extra isize: 32
Journal inode: 8
Default directory hash: half_md4
Directory Hash Seed: f959b864-fcb7-4eb0-8088-f04be25671fd
Journal backup: inode blocks
Checksum type: crc32c
Checksum: 0x7e59f1b1
[root@centos8 ~]# mkdir /mydata
[root@centos8 ~]# blkid /dev/md1
/dev/md1: UUID=”d4447cca-1a84-44c3-b3f6-9a7956091233″ TYPE=”ext4″
[root@centos8 ~]# vim /etc/fstab
#添加下面内容
UUID=d4447cca-1a84-44c3-b3f6-9a7956091233 /mydata ext4 defaults 0 0
:wq
[root@centos8 ~]# mount -a
[root@centos8 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 905164 0 905164 0% /dev
tmpfs 921932 0 921932 0% /dev/shm
tmpfs 921932 8900 913032 1% /run
tmpfs 921932 0 921932 0% /sys/fs/cgroup
/dev/sda2 104806400 2149500 102656900 3% /
/dev/sda3 52403200 398400 52004800 1% /data
/dev/sda1 999320 137584 792924 15% /boot
tmpfs 184384 0 184384 0% /run/user/0
/dev/md1 2027408 6144 1900228 1% /mydata
[root@centos8 ~]# reboot
[root@centos8 ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 905164 0 905164 0% /dev
tmpfs 921932 0 921932 0% /dev/shm
tmpfs 921932 8908 913024 1% /run
tmpfs 921932 0 921932 0% /sys/fs/cgroup
/dev/sda2 104806400 2148524 102657876 3% /
/dev/sda3 52403200 398400 52004800 1% /data
/dev/sda1 999320 137580 792928 15% /boot
/dev/md1 2027408 6144 1900228 1% /mydata
tmpfs 184384 0 184384 0% /run/user/0
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 1G 0 disk
└─md1 9:1 0 2G 0 raid5 /mydata
sdc 8:32 0 1G 0 disk
└─md1 9:1 0 2G 0 raid5 /mydata
sdd 8:48 0 1G 0 disk
└─md1 9:1 0 2G 0 raid5 /mydata
sr0 11:0 1 7.7G 0 rom

[root@centos8 ~]# scandisk
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 15G 0 disk
sdc 8:32 0 5G 0 disk
sr0 11:0 1 7.7G 0 rom
#添加两块硬盘sdb、sdc
[root@centos8 ~]# pvs /dev/sd{b,c}
-bash: pvs: command not found
[root@centos8 ~]# dnf -y install lvm2
[root@centos8 ~]# pvs
[root@centos8 ~]# vgs
[root@centos8 ~]# lvs
[root@centos8 ~]# pvcreate /dev/sd{b,c} #把两块硬盘加到物理卷
Physical volume “/dev/sdb” successfully created.
Physical volume “/dev/sdc” successfully created.
[root@centos8 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sdb lvm2 — 15.00g 15.00g
/dev/sdc lvm2 — 5.00g 5.00g
[root@centos8 ~]# vgcreate -s 16M testvg /dev/sd{b,c} #把 /dev/sdb和/dev/sdc加入到卷组，块大小为16M
Volume group “testvg” successfully created
[root@centos8 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
testvg 2 0 0 wz–n- <19.97g <19.97g
[root@centos8 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sdb testvg lvm2 a– 14.98g 14.98g
/dev/sdc testvg lvm2 a– 4.98g 4.98g
[root@centos8 ~]# vgdisplay
— Volume group —
VG Name testvg
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size <19.97 GiB #卷组大小20G
PE Size 16.00 MiB #块大小为16M
Total PE 1278
Alloc PE / Size 0 / 0
Free PE / Size 1278 / <19.97 GiB
VG UUID ICjCEw-pbWT-0jUt-f4hV-lDOJ-YSSq-o3tq5U
[root@centos8 ~]# lvcreate -L 5G -n testlv testvg #创建逻辑卷testlv，大小5G
Logical volume “testlv” created.
[root@centos8 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
testlv testvg -wi-a—– 5.00g
[root@centos8 ~]# lvdisplay
— Logical volume —
LV Path /dev/testvg/testlv
LV Name testlv
VG Name testvg
LV UUID aPZyRk-7n9N-P7ol-ZwJv-2LHI-aOm2-8tED5j
LV Write Access read/write
LV Creation host, time centos8.neteagles.cn, 2020-12-06 19:54:00 +0800
LV Status available
# open 0
LV Size 5.00 GiB
Current LE 320
Segments 1
Allocation inherit
Read ahead sectors auto
– currently set to 8192
Block device 253:0
[root@centos8 ~]# mkfs.ext4 /dev/testvg/testlv #创建逻辑卷文件系统
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 1310720 4k blocks and 327680 inodes
Filesystem UUID: 81a7eb1b-72ae-4d5c-9d0f-44a3daa14610
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736
Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done
[root@centos8 ~]# mkdir /users
[root@centos8 ~]# mount /dev/testvg/testlv /users/ #挂载逻辑卷
[root@centos8 ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 884M 0 884M 0% /dev
tmpfs tmpfs 901M 0 901M 0% /dev/shm
tmpfs tmpfs 901M 8.7M 892M 1% /run
tmpfs tmpfs 901M 0 901M 0% /sys/fs/cgroup
/dev/sda2 xfs 100G 2.1G 98G 3% /
/dev/sda3 xfs 50G 390M 50G 1% /data
/dev/sda1 ext4 976M 135M 775M 15% /boot
tmpfs tmpfs 181M 0 181M 0% /run/user/0
/dev/mapper/testvg-testlv ext4 4.9G 20M 4.6G 1% /users #已被挂载

[root@centos8 ~]# useradd -d /users/archlinux archlinux
[root@centos8 ~]# getent passwd archlinux
archlinux:x:1001:1001::/users/archlinux:/bin/bash
[root@centos8 ~]# su archlinux
[archlinux@centos8 root]$ cp -r /etc/pam.d ~
[archlinux@centos8 root]$ ll -a /users/archlinux/
total 28
drwx—— 3 archlinux archlinux 4096 Dec 6 19:57 .
drwxr-xr-x 4 root root 4096 Dec 6 19:56 ..
-rw——- 1 archlinux archlinux 93 Dec 6 19:57 .bash_history
-rw-r–r– 1 archlinux archlinux 18 Nov 9 2019 .bash_logout
-rw-r–r– 1 archlinux archlinux 141 Nov 9 2019 .bash_profile
-rw-r–r– 1 archlinux archlinux 312 Nov 9 2019 .bashrc
drwxr-xr-x 2 archlinux archlinux 4096 Dec 6 19:56 pam.d

[archlinux@centos8 root]$ exit
exit
[root@centos8 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
testvg 2 1 0 wz–n- <19.97g <14.97g #卷组可用空间为15G
[root@centos8 ~]# lvextend -r -L +2G /dev/testvg/testlv
Size of logical volume testvg/testlv changed from 5.00 GiB (320 extents) to 7.00 GiB (448 extents).
Logical volume testvg/testlv successfully resized.
resize2fs 1.45.4 (23-Sep-2019)
Filesystem at /dev/mapper/testvg-testlv is mounted on /users; on-line resizing required
old_desc_blocks=1, new_desc_blocks=1
The filesystem on /dev/mapper/testvg-testlv is now 1835008 (4k) blocks long.
[root@centos8 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
testlv testvg -wi-ao—- 7.00g
[root@centos8 ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 884M 0 884M 0% /dev
tmpfs tmpfs 901M 0 901M 0% /dev/shm
tmpfs tmpfs 901M 8.7M 892M 1% /run
tmpfs tmpfs 901M 0 901M 0% /sys/fs/cgroup
/dev/sda2 xfs 100G 2.1G 98G 3% /
/dev/sda3 xfs 50G 390M 50G 1% /data
/dev/sda1 ext4 976M 135M 775M 15% /boot
tmpfs tmpfs 181M 0 181M 0% /run/user/0
/dev/mapper/testvg-testlv ext4 6.9G 23M 6.5G 1% /users
[root@centos8 ~]# ll -a /users/archlinux/
total 28
drwx—— 3 archlinux archlinux 4096 Dec 6 19:57 .
drwxr-xr-x 4 root root 4096 Dec 6 19:56 ..
-rw——- 1 archlinux archlinux 93 Dec 6 19:57 .bash_history
-rw-r–r– 1 archlinux archlinux 18 Nov 9 2019 .bash_logout
-rw-r–r– 1 archlinux archlinux 141 Nov 9 2019 .bash_profile
-rw-r–r– 1 archlinux archlinux 312 Nov 9 2019 .bashrc
drwxr-xr-x 2 archlinux archlinux 4096 Dec 6 19:56 pam.d #数据还在

[root@centos8 ~]# umount /dev/testvg/testlv #取消挂载
[root@centos8 ~]# fsck -f /dev/testvg/testlv #检查文件系统
fsck from util-linux 2.32.1
e2fsck 1.45.4 (23-Sep-2019)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mapper/testvg-testlv: 40/458752 files (0.0% non-contiguous), 50972/1835008 blocks
[root@centos8 ~]# resize2fs /dev/testvg/testlv 3G #缩减文件系统
resize2fs 1.45.4 (23-Sep-2019)
Resizing the filesystem on /dev/testvg/testlv to 786432 (4k) blocks.
The filesystem on /dev/testvg/testlv is now 786432 (4k) blocks long.
[root@centos8 ~]# lvreduce -L 3G /dev/testvg/testlv #缩减逻辑卷
WARNING: Reducing active logical volume to 3.00 GiB.
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce testvg/testlv? [y/n]: y
Size of logical volume testvg/testlv changed from 7.00 GiB (448 extents) to 3.00 GiB (192 extents).
Logical volume testvg/testlv successfully resized.
[root@centos8 ~]# mount /dev/testvg/testlv /users/ #挂载逻辑卷
[root@centos8 ~]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 884M 0 884M 0% /dev
tmpfs tmpfs 901M 0 901M 0% /dev/shm
tmpfs tmpfs 901M 8.7M 892M 1% /run
tmpfs tmpfs 901M 0 901M 0% /sys/fs/cgroup
/dev/sda2 xfs 100G 2.1G 98G 3% /
/dev/sda3 xfs 50G 390M 50G 1% /data
/dev/sda1 ext4 976M 135M 775M 15% /boot
tmpfs tmpfs 181M 0 181M 0% /run/user/0
/dev/mapper/testvg-testlv ext4 2.9G 16M 2.8G 1% /users #现在已经缩减至3G
[root@centos8 ~]# ll -a /users/archlinux/
total 28
drwx—— 3 archlinux archlinux 4096 Dec 6 19:57 .
drwxr-xr-x 4 root root 4096 Dec 6 19:56 ..
-rw——- 1 archlinux archlinux 93 Dec 6 19:57 .bash_history
-rw-r–r– 1 archlinux archlinux 18 Nov 9 2019 .bash_logout
-rw-r–r– 1 archlinux archlinux 141 Nov 9 2019 .bash_profile
-rw-r–r– 1 archlinux archlinux 312 Nov 9 2019 .bashrc
drwxr-xr-x 2 archlinux archlinux 4096 Dec 6 19:56 pam.d
#数据还在

[root@centos8 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
testlv testvg -wi-ao—- 3.00g #逻辑卷还有未使用空间
[root@centos8 ~]# lvcreate -s -L 1G -n testlv-snapshot -p r /dev/testvg/testlv
Logical volume “testlv-snapshot” created.
[root@centos8 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
testlv testvg owi-aos— 3.00g
testlv-snapshot testvg sri-a-s— 1.00g testlv 0.01
[root@centos8 ~]# lvdisplay
— Logical volume —
LV Path /dev/testvg/testlv
LV Name testlv
VG Name testvg
LV UUID aPZyRk-7n9N-P7ol-ZwJv-2LHI-aOm2-8tED5j
LV Write Access read/write
LV Creation host, time centos8.neteagles.cn, 2020-12-06 19:54:00 +0800
LV snapshot status source of
testlv-snapshot [active]
LV Status available
# open 1
LV Size 3.00 GiB
Current LE 192
Segments 1
Allocation inherit
Read ahead sectors auto
– currently set to 8192
Block device 253:0
— Logical volume —
LV Path /dev/testvg/testlv-snapshot
LV Name testlv-snapshot
VG Name testvg
LV UUID PvdE7T-kJCO-ogxX-bjZ3-jRbT-SwVn-z9KqJ9
LV Write Access read only
LV Creation host, time centos8.neteagles.cn, 2020-12-06 20:12:33 +0800
LV snapshot status active destination for testlv
LV Status available
# open 0
LV Size 3.00 GiB
Current LE 192
COW-table size 1.00 GiB
COW-table LE 64
Allocated to snapshot 0.01%
Snapshot chunk size 4.00 KiB
Segments 1
Allocation inherit
Read ahead sectors auto
– currently set to 8192
Block device 253:3
[root@centos8 ~]# mkdir /mnt/testlv-snapshot
[root@centos8 ~]# mount /dev/testvg/testlv-snapshot /mnt/testlv-snapshot/
mount: /mnt/testlv-snapshot: WARNING: device write-protected, mounted read-only.
[root@centos8 ~]# ls /mnt/testlv-snapshot/
archlinux lost+found
[root@centos8 ~]# ls /users/
archlinux lost+found
[root@centos8 ~]# ls /users/archlinux/
pam.d
[root@centos8 ~]# rm -rf /users/archlinux/pam.d/ #删除逻辑卷中的牡蛎
[root@centos8 ~]# ls /users/archlinux/ #逻辑卷中已经没有了
[root@centos8 ~]# ls /mnt/testlv-snapshot/archlinux/
pam.d
#快照中还在
[root@centos8 ~]# rm -rf /mnt/testlv-snapshot/archlinux/pam.d/
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/runuser’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/polkit-1’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/systemd-user’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/passwd’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/password-auth’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/vmtoolsd’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/system-auth’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/vlock’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/runuser-l’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/sssd-shadowutils’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/su’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/postlogin’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/remote’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/sudo-i’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/fingerprint-auth’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/sshd’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/config-util’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/su-l’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/smartcard-auth’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/sudo’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/other’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/login’: Read-only file system
rm: cannot remove ‘/mnt/testlv-snapshot/archlinux/pam.d/crond’: Read-only file system
#快照中的文件不能删除
[root@centos8 ~]# umount /dev/testvg/testlv #取消挂载逻辑卷
[root@centos8 ~]# umount /mnt/testlv-snapshot/ #取消挂载快照
[root@centos8 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
testlv testvg owi-a-s— 3.00g
testlv-snapshot testvg sri-a-s— 1.00g testlv 0.01
[root@centos8 ~]# lvconvert –merge /dev/testvg/testlv-snapshot #合并快照
Merging of volume testvg/testlv-snapshot started.
testvg/testlv: Merged: 100.00%
[root@centos8 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
testlv testvg -wi-a—– 3.00g #快照只是一次性的，还原过后就没有了
[root@centos8 ~]# mount /dev/testvg/testlv /users/
#挂载逻辑卷
[root@centos8 ~]# ll /users/
total 20
drwx—— 3 archlinux archlinux 4096 Dec 6 19:57 archlinux
drwx—— 2 root root 16384 Dec 6 19:54 lost+found
[root@centos8 ~]# ll /users/archlinux/
total 4
drwxr-xr-x 2 archlinux archlinux 4096 Dec 6 19:56 pam.d
#还原成做快照时的文件了

[root@centos8 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
testlv testvg -wi-ao—- 3.00g
[root@centos8 ~]# umount /dev/testvg/testlv #取消逻辑卷挂载
[root@centos8 ~]# lvremove /dev/testvg/testlv #删除逻辑卷
Do you really want to remove active logical volume testvg/testlv? [y/n]: y
Logical volume “testlv” successfully removed
[root@centos8 ~]# lvs
[root@centos8 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
testvg 2 0 0 wz–n- <19.97g <19.97g
[root@centos8 ~]# vgremove testvg #删除卷组
Volume group “testvg” successfully removed
[root@centos8 ~]# vgs
[root@centos8 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sdb lvm2 — 15.00g 15.00g
/dev/sdc lvm2 — 5.00g 5.00g
[root@centos8 ~]# pvremove /dev/sd{b,c} #删除逻辑卷
Labels on physical volume “/dev/sdb” successfully wiped.
Labels on physical volume “/dev/sdc” successfully wiped.
[root@centos8 ~]# pvs
[root@centos8 ~]# lvblk
-bash: lvblk: command not found
[root@centos8 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 50G 0 part /data
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 4G 0 part [SWAP]
sdb 8:16 0 15G 0 disk
sdc 8:32 0 5G 0 disk
sr0 11:0 1 7.7G 0 rom

您可能感兴趣的文章:基于MySQL在磁盘上存储NULL值如何将mysql存储位置迁移到一块新的磁盘上Mysql存储引擎MyISAM的常见问题（表损坏、无法访问、磁盘空间不足）Linux磁盘配额管理图文案例Linux磁盘设备与LVM管理命令示例详解详解Centos7扩展磁盘空间（LVM管理）