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Migrate /home partition
2022-07-05 16:17:00 【51CTO】
Experimental environment
Originally installed by the company Centos The server adopts the scheme of automatic partition , With the increasing number of system users using servers , The root partition often faces disk space exhaustion , There were even several times that the system could not start , To solve these problems , Now we need to add a new piece for the server scsl Hard disk , And put the user directory /home Migrate the data from to this hard disk , It is required that the use of the original user account cannot be affected after the migration .
Requirements describe
Add a piece to the virtual machine 80GB Of SCSI disk
Create a new hard drive 20GB The partition , It is used to store all ordinary user host folders
command ( Input m get help )：n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Zone number (1-4, Default 1)：1
start A sector (2048-167772159, The default is 2048)：
The default value... Will be used 2048
Last A sector , + A sector or +size{K,M,G} (2048-167772159, The default is 167772159)：+20G
Partition 1 Set to Linux type , The size is set to 20 GiB
command ( Input m get help )：p
disk /dev/sdb：85.9 GB, 85899345920 byte ,167772160 Sectors
Units = A sector of 1 * 512 = 512 bytes
Sector size ( Logic / Physics )：512 byte / 512 byte
I/O size ( Minimum / The best )：512 byte / 512 byte
Disk label type ：dos
Disk identifier ：0x47dca76d
equipment Boot Start End Blocks Id System
/dev/sdb1 2048 41945087 20971520 83 Linux
command ( Input m get help )：w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Synchronizing disk .
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After partition, the disk needs to be formatted
[[email protected] ~]# mkfs -t ext4 /dev/sdb1
mke2fs 1.42.9 (28-Dec-2013)
File system tags =
OS type: Linux
Block size =4096 (log=2)
Block size =4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1310720 inodes, 5242880 blocks
262144 blocks (5.00%) reserved for the super user
The first data block =0
Maximum filesystem blocks=2153775104
160 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: complete
Are written to the inode surface : complete
Creating journal (32768 blocks): complete
Writing superblocks and filesystem accounting information: complete
[[email protected] ~]#
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The new partition is still mounted to /home Under the table of contents , You need to import the data of the original user in the system
[[email protected] ~]# mkdir /zhang
[[email protected] ~]# mv /home/* -t /zhang/
[[email protected] ~]# ls /zhang/
bdqn kylin obama zhang
[[email protected] ~]# ls /home/
[[email protected] ~]# mount /dev/sdb1 /home/
[[email protected] ~]# df
file system 1K- block Already used You can use Already used % Mount point
devtmpfs 481616 0 481616 0% /dev
tmpfs 497836 0 497836 0% /dev/shm
tmpfs 497836 8676 489160 2% /run
tmpfs 497836 0 497836 0% /sys/fs/cgroup
/dev/sda3 18873344 5782856 11349848 34% /
/dev/sda1 1038336 173828 864508 17% /boot
tmpfs 99568 24 99544 1% /run/user/0
/dev/sr0 4600876 4600876 0 100% /run/media/root/CentOS 7 x86_64
/dev/sdb1 20511312 45080 19401272 1% /home
[[email protected] ~]# ls -al /home/
Total usage 20
drwxr-xr-x 3 root root 4096 7 month 4 15:31 .
dr-xr-xr-x. 1 root root 230 7 month 4 15:33 ..
drwx------ 2 root root 16384 7 month 4 15:31 lost+found
[[email protected] ~]# mv /zhang/* -t /home/
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The server can automatically mount the partition after each boot
Check the partition after restart
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