xfs文件系统lvm缩小空间操作（/home从100G减小到80G)
[root@xifenfei ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 449G 6.0G 443G 2% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 0 63G 0% /dev/shm
tmpfs 63G 20M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/mapper/rhel-home 100G 38M 100G 1% /home
/dev/sda2 1014M 165M 850M 17% /boot
/dev/sda1 200M 9.8M 191M 5% /boot/efi
tmpfs 13G 4.0K 13G 1% /run/user/42
tmpfs 13G 32K 13G 1% /run/user/0
/dev/sr0 4.2G 4.2G 0 100% /media
[root@xifenfei u01]# xfsdump -f /home.xfsdump /home
xfsdump: using file dump (drive_simple) strategy
xfsdump: version 3.1.7 (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: "tar czvf /home.tar.gz /home
home"
--------------------------------- end dialog ---------------------------------
xfsdump: level 0 dump of xifenfei:/home
xfsdump: dump date: Fri Jun 25 11:37:13 2021
xfsdump: session id: 4d75008e-9927-417d-9722-52d13bb89eb0
xfsdump: session label:
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: 4828224 bytes
xfsdump: /var/lib/xfsdump/inventory created
============================= 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 4732672 bytes
xfsdump: dump size (non-dir files) : 4588480 bytes
xfsdump: dump complete: 4 seconds elapsed
xfsdump: Dump Summary:
xfsdump: stream 0 /home.xfsdump OK (success)
xfsdump: Dump Status: SUCCESS
[root@xifenfei u01]# umount /home
[root@xifenfei u01]# lvreduce -L 80G /dev/mapper/rhel-home
WARNING: Reducing active logical volume to 80.00 GiB.
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce rhel/home? [y/n]: y
Size of logical volume rhel/home changed from 100.00 GiB (25600 extents) to 80.00 GiB (20480 extents).
Logical volume rhel/home successfully resized.
[root@xifenfei u01]# mkfs.xfs -f /dev/mapper/rhel-home
meta-data=/dev/mapper/rhel-home isize=512 agcount=16, agsize=1310720 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=20971520, imaxpct=25
= sunit=64 swidth=64 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=10240, version=2
= sectsz=512 sunit=64 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@xifenfei u01]# mount /home
xfsrestore -f /home.xfsdump /home
[root@xifenfei u01]# xfsrestore -f /home.xfsdump /home
xfsrestore: using file dump (drive_simple) strategy
xfsrestore: version 3.1.7 (dump format 3.0) - type ^C for status and control
xfsrestore: searching media for dump
xfsrestore: examining media file 0
xfsrestore: dump description:
xfsrestore: hostname: xifenfei
xfsrestore: mount point: /home
xfsrestore: volume: /dev/mapper/rhel-home
xfsrestore: session time: Fri Jun 25 11:37:13 2021
xfsrestore: level: 0
xfsrestore: session label: "tar czvf /home.tar.gz /home
home"
xfsrestore: media label: "home"
xfsrestore: file system id: b996cff9-332b-4c07-96e1-8335a1f23627
xfsrestore: session id: 4d75008e-9927-417d-9722-52d13bb89eb0
xfsrestore: media id: 6094b9b5-a45f-4638-a0e2-c1b982ead67b
xfsrestore: using online session inventory
xfsrestore: searching media for directory dump
xfsrestore: reading directories
xfsrestore: 119 directories and 188 entries processed
xfsrestore: directory post-processing
xfsrestore: restoring non-directory files
xfsrestore: restore complete: 0 seconds elapsed
xfsrestore: Restore Summary:
xfsrestore: stream 0 /home.xfsdump OK (success)
xfsrestore: Restore Status: SUCCESS
[root@xifenfei u01]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 449G 14G 435G 4% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 20M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/sda2 1014M 165M 850M 17% /boot
/dev/sda1 200M 9.8M 191M 5% /boot/efi
tmpfs 13G 4.0K 13G 1% /run/user/42
tmpfs 13G 28K 13G 1% /run/user/0
/dev/sr0 4.2G 4.2G 0 100% /media
tmpfs 63G 0 63G 0% /dev/shm
/dev/mapper/rhel-home 80G 38M 80G 1% /home
xfs系统的lvm无法直接缩小空间,只能是通过xfsdump /home内容,然后lvm缩小空间重做xfs文件系统,再使用xfsdump还原
lvm扩容swap空间(swap从8G扩大到16G)
[root@xifenfei home]# free -m
total used free shared buff/cache available
Mem: 128355 86907 26110 274 15338 37632
Swap: 8192 0 8192
[root@xifenfei home]# lvextend -L 16GB /dev/rhel/swap
Size of logical volume rhel/swap changed from 8.00 GiB (2048 extents) to 16.00 GiB (4096 extents).
Logical volume rhel/swap successfully resized.
[root@xifenfei home]# sync;sync
[root@xifenfei home]# swapoff /dev/rhel/swap
mkswap /dev/rhel/swap
[root@xifenfei home]# mkswap /dev/rhel/swap
mkswap: /dev/rhel/swap: warning: wiping old swap signature.
swapon /dev/rhel/swap Setting up swapspace version 1, size = 16777212 KiB
no label, UUID=8d79ccf4-1796-49c9-968d-23abb67bc6eb
[root@xifenfei home]# swapon /dev/rhel/swap
[root@xifenfei home]# free -m
total used free shared buff/cache available
Mem: 128355 86907 26110 274 15338 37632
Swap: 16383 0 16383
