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ipic
Guru
Joined: 29 Dec 2003
Posts: 432
Location: UK
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 Posted: Sun Jan 26, 2025 6:51 pm Post subject: LVM resize fails: Device or resource busy |
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I have a logical volume that I wish to reduce in size. It contains a single ext4 filesystem.
I've tried the following:
| Code: |
~ # lvscan
....
ACTIVE '/dev/vg01/rsnapshot' [700.00 GiB] inherit
...
~ # resize2fs -M /dev/vg01/rsnapshot
resize2fs 1.47.1 (20-May-2024)
Filesystem at /dev/vg01/rsnapshot is mounted on /mnt/rsnapshot; on-line resizing required
resize2fs: On-line shrinking not supported
~ # fuser -amuv /dev/vg01/rsnapshot
USER PID ACCESS COMMAND
/dev/dm-4: root kernel mount (root)/mnt/rsnapshot
~ # umount /dev/mapper/vg01-rsnapshot
~ # fuser -amuv /dev/vg01/rsnapshot
USER PID ACCESS COMMAND
/dev/dm-4:
~ # resize2fs -M /dev/vg01/rsnapshot
resize2fs 1.47.1 (20-May-2024)
resize2fs: Device or resource busy while trying to open /dev/vg01/rsnapshot
Couldn't find valid filesystem superblock.
~ # lsof -l | grep dm-4
jbd2/dm-4 3244 0 cwd DIR 251,10 4096 2 /
jbd2/dm-4 3244 0 rtd DIR 251,10 4096 2 /
jbd2/dm-4 3244 0 txt unknown /proc/3244/exe
~ # ps -ef | grep 3244
root 3244 2 0 Jan25 ? 00:00:03 [jbd2/dm-4-8]
~ # lvchange --activate n /dev/vg01/rsnapshot
Logical volume vg01/rsnapshot contains a filesystem in use.
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With the filesystem unmounted, fuser shows no users active, but lsof shows the task 3244 active, which is [jbd2/dm-4-8]
It appears that this causes LVM and resize2fs to think that the device is in use.
(There is no active snapshot for this logical volume)
Does anyone know what this task is, and whether it can be stopped so that filesystem and logical volume can be resized?
Or, is there an option that allows resize2fs to do on-line shrinking?
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sublogic
Guru
Joined: 21 Mar 2022
Posts: 305
Location: Pennsylvania, USA
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| Posted: Mon Jan 27, 2025 3:00 am Post subject: |
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| [jbd2/dm-4-8] is a kernel thread (note the enclosing [ ]). It has to do with flushing filesystem journal transactions ? I don't know more than that and I don't know how to stop it. |
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