Shrink
## take note the logical volume details and confirm it is formatted with xfs
[root@rhel7sat1 ~]# 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 199G 0 part
├─rhel-root 253:0 0 50G 0 lvm /
├─rhel-swap 253:1 0 7.9G 0 lvm [SWAP]
└─rhel-home 253:2 0 141.1G 0 lvm /home
sr0 11:0 1 57.7M 0 rom
[root@rhel7sat1 ~]# grep \/home /etc/fstab
/dev/mapper/rhel-home /home xfs defaults 0 0
## We want to shrink /dev/rhel/home currently using 141g and mounted on /home
## (1). Take backup of the filesystem using xfsdump
[root@rhel7sat1 ~]# xfsdump -f /var/tmp/home-xfs.dump /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: "home"
--------------------------------- end dialog ---------------------------------
xfsdump: level 0 dump of rhel7sat1:/home
xfsdump: dump date: Wed Jul 22 10:48:37 2020
xfsdump: session id: 768efc3e-737c-44d4-a71f-07523bd15e12
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: 35328 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 27552 bytes
xfsdump: dump size (non-dir files) : 1632 bytes
xfsdump: dump complete: 3 seconds elapsed
xfsdump: Dump Summary:
xfsdump: stream 0 /var/tmp/home-xfs.dump OK (success)
xfsdump: Dump Status: SUCCESS
## (2) unmount
[root@rhel7sat1 ~]#
umount /home
## (3) reduce the logical volume
[root@rhel7sat1 ~]# lvreduce -L 9G /dev/rhel/home
WARNING: Reducing active logical volume to 9.00 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 10.00 GiB (2560 extents) to 9.00 GiB (2304 extents).
Logical volume rhel/home successfully resized
## (4) reformat the reduced LVM to xfs
[root@rhel7sat1 ~]# mkfs.xfs -f /dev/rhel/home
meta-data=/dev/rhel/home isize=512 agcount=4, agsize=589824 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=2359296, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
## (5) re-mount
[root@rhel7sat1 ~]# mount /dev/rhel/home /home
[root@rhel7sat1 ~]# df -h /home
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-home 9.0G 33M 9.0G 1% /home
## (6) restore from dump
[root@rhel7sat1 ~]# xfsrestore -f /var/tmp/home-xfs.dmp /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: rhel7sat1
xfsrestore: mount point: /home
xfsrestore: volume: /dev/mapper/rhel-home
xfsrestore: session time: Wed Jul 22 11:13:15 2020
xfsrestore: level: 0
xfsrestore: session label: "home"
xfsrestore: media label: "home"
xfsrestore: file system id: 82825a22-5e1e-4ea6-bde9-38077a069767
xfsrestore: session id: 9ab9dda5-52a9-446b-9380-f60cafdd5c21
xfsrestore: media id: 797cce91-d6c8-4d03-94b0-edd03bda3b90
xfsrestore: using online session inventory
xfsrestore: searching media for directory dump
xfsrestore: reading directories
xfsrestore: 5 directories and 7 entries processed
xfsrestore: directory post-processing
xfsrestore: restoring non-directory files
xfsrestore: restore complete: 0 seconds elapsed
xfsrestore: Restore Summary:
xfsrestore: stream 0 /var/tmp/home-xfs.dmp OK (success)
xfsrestore: Restore Status: SUCCESS
Grow
## Scenario 1 : Cloning to a bigger disk
## Firstly follow his guide to extend the disk
Please enable JavaScript to view the comments powered by Disqus.