简单记录一下Rocky9调整根分区大小.
背景
Rocky9默认安装的时候, 根目录只有70G, 有点小了，而且/home基本用不上, 所以需要调整一下.
查看根目录容量df -h
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 4.0M 0 4.0M 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 6.2G 19M 6.2G 1% /run
/dev/mapper/rl-root 70G 4.3G 66G 7% /
/dev/mapper/rl-home 867G 6.1G 861G 1% /home
/dev/nvme0n1p2 1014M 283M 732M 28% /boot
/dev/nvme0n1p1 599M 7.0M 592M 2% /boot/efi
tmpfs 3.1G 96K 3.1G 1% /run/user/987
tmpfs 3.1G 36K 3.1G 1% /run/user/0
操作
Rocky9默认使用的是LVM, 且基于xfs文件系统
备份/home(可选)
可跳过，我的系统是空系统，默认不备份了
xfsdump -f /home.bak /home
操作
xfsdump -f /home.bak /home
xfsdump: using file dump (drive_simple) strategy
xfsdump: version 3.1.10 (dump format 3.0) - type ^C for status and control
============================= dump label dialog ==============================
please enter label for this dump session (timeout in 300 sec)
-> home
session label entered: "home"
--------------------------------- end dialog ---------------------------------
xfsdump: level 0 dump of q-7-206.quickon.me:/home
xfsdump: dump date: Tue Apr 18 04:01:01 2023
xfsdump: session id: b1ae3c16-70ee-4634-9ac2-b4a1a9429498
xfsdump: session label: "home"
xfsdump: ino map phase 1: constructing initial dump list
xfsdump: ino map phase 2: skipping (no pruning necessary)
xfsdump: ino map phase 3: skipping (only one dump stream)
xfsdump: ino map construction complete
xfsdump: estimated dump size: 20800 bytes
============================= media label dialog =============================
please enter label for media in drive 0 (timeout in 300 sec)
-> home
media label entered: "home"
--------------------------------- end dialog ---------------------------------
xfsdump: creating dump session media file 0 (media 0, file 0)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: ending media file
xfsdump: media file size 21352 bytes
xfsdump: dump size (non-dir files) : 0 bytes
xfsdump: dump complete: 15 seconds elapsed
xfsdump: Dump Summary:
xfsdump: stream 0 /home.bak OK (success)
xfsdump: Dump Status: SUCCESS
卸载/home
umount /home
缩容/home逻辑卷
减少/home挂载点对应的逻辑卷大小
lvreduce -L 50G /dev/mapper/rl-home
WARNING: Reducing active logical volume to 50.00 GiB.
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce rl/home? [y/n]: y
Size of logical volume rl/home changed from <866.70 GiB (221875 extents) to 50.00 GiB (12800 extents).
Logical volume rl/home successfully resized.
扩容/逻辑卷
lvextend -l +100%FREE /dev/rl/root
Size of logical volume rl/root changed from 70.00 GiB (17920 extents) to <886.70 GiB (226995 extents).
Logical volume rl/root successfully resized.
参数
—L: 指定逻辑卷的大小，单位为MmGgTt-l: 指定逻辑卷的大小(LE数)-l +100%FREE: 将卷组中的空闲空间全部分配给当前逻辑卷
执行扩容生效
xfs_growfs /dev/rl/root
重新挂载/home
mkfs.xfs -f /dev/mapper/rl-home
mount /home
恢复(可选)
可选
xfsrestore -f /home.bak /home
验证
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 4.0M 0 4.0M 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 6.2G 15M 6.2G 1% /run
/dev/mapper/rl-root 887G 11G 877G 2% /
/dev/nvme0n1p2 1014M 356M 659M 36% /boot
/dev/nvme0n1p1 599M 7.0M 592M 2% /boot/efi
tmpfs 3.1G 100K 3.1G 1% /run/user/987
tmpfs 3.1G 36K 3.1G 1% /run/user/0
/dev/mapper/rl-home 50G 390M 50G 1% /home
补充
如果/home不用可以执行卸载
umount /home
# 删除逻辑卷
lvremove /dev/rl/home
# 查看卷组，记录 Free PE
lvdisplay
# 删除home分区挂载配置
vi /etc/fstab