lvreduce

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Shrinking is risky: if the LV gets smaller than the file system, data is lost. lvreduce -r checks and shrinks the file system before the LV (it may need to unmount it; newer lvm2 asks or does it with --fsmode manage).

XFS file systems cannot be shrunk. To make an XFS volume smaller: back up, recreate smaller, restore.

طريقة الكتابة

lvreduce (-L [-]SIZE | -l [-]EXTENTS) [-r] [OPTION]... VG/LV

الخيارات 21

الأكثر استخدامًا

-L, --size [-]SIZE: New size or - removed size, like -1G or 3G.
-l, --extents [-]N[%VG|%LV|%FREE|%ORIGIN]: In extents or percent.
-r, --resizefs: Shrink the file system first (ext4).
-n, --nofsck: Do not check the file system first.
--fs checksize|resize|resize_fsadm|ignore: File system handling (newer lvm2).
--fsmode manage|offline|nochange: May LVM unmount/mount for the resize.
-f, --force: Do not ask (dangerous).
-A, --autobackup y|n: Back up the metadata.
--noudevsync: Do not wait for udev.
--reportformat basic|json: Output format.

Common LVM options

-t, --test: Test only; change nothing.
-v, --verbose: More output (repeat for more).
-q, --quiet: Less output.
-y, --yes: Answer yes to questions.
-d, --debug: Debug output.
--config STRING: Override lvm.conf settings for this command only.
--commandprofile STRING, --profile STRING: Use a configuration profile.
--devices PV, --devicesfile STRING: Limit the devices LVM looks at.
--driverloaded y|n, --nolocking, --lockopt STRING, --nohints, --journal STRING: Special and debug settings.
-h, --help, --longhelp: Show help.
--version: Show the version.

أمثلة 10

$ مستخدم عادي# بصلاحية root (أو مع sudo)

1Shrink an ext4 LV safely
```
#lvreduce -r -L 3G /dev/vgfiles/lvdocs
```
Runs e2fsck and resize2fs, then shrinks the LV.
2Remove 1 GiB
```
#lvreduce -r -L -1G /dev/vgfiles/lvdocs
```
Relative size.
3Check the free space first
```
$df -h /docs
```
The data must fit into the new size.

4Do it by hand (old way)

#umount /docs
#e2fsck -f /dev/vgfiles/lvdocs
#resize2fs /dev/vgfiles/lvdocs 3G
#lvreduce -L 3G /dev/vgfiles/lvdocs
#mount /docs

File system first, then LV — never the other way.

5Test only

#lvreduce -t -r -L 3G /dev/vgfiles/lvdocs

Shows what would happen.

6XFS cannot shrink
```
#lvreduce -r -L 3G /dev/vgfiles/lvfiles
```
Fails for XFS: back up, lvremove, lvcreate smaller, mkfs.xfs, restore.

7Shrink a swap LV

#swapoff /dev/rhel/swap; lvreduce -L 1G /dev/rhel/swap; mkswap /dev/rhel/swap; swapon -a

Swap holds no data after swapoff.

8Free space for another LV

#lvreduce -r -L -2G /dev/vgdata/lvweb; lvcreate -n lvnew -L 2G vgdata

Move space between LVs in one VG.

9Verify the data afterwards
```
#ls /docs; df -h /docs
```
Your files are still there.
10Back up before shrinking
```
#tar -czf /root/docs-backup.tgz -C /docs .
```
Always, on real systems.

انتبه

Never lvreduce without -r on an LV with a file system: the end of the file system is cut off.

رموز الخروج

0 :: Done. 5 :: Error.

`lvreduce`

ماذا يفعل

طريقة الكتابة

الخيارات 21

Common LVM options

أمثلة 10

1Shrink an ext4 LV safely

2Remove 1 GiB

3Check the free space first

4Do it by hand (old way)

5Test only

6XFS cannot shrink

7Shrink a swap LV

8Free space for another LV

9Verify the data afterwards

10Back up before shrinking

انتبه

رموز الخروج

الدليل الكامل

ماذا يفعل

طريقة الكتابة

الخيارات 21

Common LVM options

أمثلة 10

1Shrink an ext4 LV safely

2Remove 1 GiB

3Check the free space first

4Do it by hand (old way)

5Test only

6XFS cannot shrink

7Shrink a swap LV

8Free space for another LV

9Verify the data afterwards

10Back up before shrinking

انتبه

رموز الخروج

أوامر مرتبطة

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الدليل الكامل

`lvreduce`