Red Hat Bugzilla – Bug 753550
lvm snapshots nearly unusable with f16
Last modified: 2013-02-13 11:27:09 EST
Description of problem:
Switch to f16 made working with LVM snapshots nearly impossible:
# /sbin/lvm lvcreate --quiet -p r -L 5G -s -n .data.backup vg01/data
Internal error: Performing unsafe table load while 2 device(s) are known to be suspended: (253:46)
--> 'hdparm -C' shows, that all harddrives are in active/idle state
# /bin/mount -o ro /dev/vg01/.data.backup /tmp/localbackup.8tMCfb/ROOTMNT
mount: /dev/mapper/vg01-data-real already mounted or /tmp/localbackup.8tMCfb/ROOTMNT busy
--> ??? directory structure is /dev/vg01/.data.backup
brw-rw----. 1 root disk 253, 31 12. Nov 05:08 /dev/dm-31
lrwxrwxrwx. 1 root root 8 13. Nov 11:46 /dev/vg01/.data.backup -> ../dm-31
why is there used '/dev/mapper/vg01-data-real'?
# lvremove /dev/vg01/.data.backup
Do you really want to remove active logical volume .data.backup? [y/n]: y
LV vg01/.data.backup in use: not deactivating
Unable to deactivate logical volume ".data.backup"
--> this issue exists since fedora 12; when can we expect a solution?
Version-Release number of selected component (if applicable):
(In reply to comment #0)
> Description of problem:
> Switch to f16 made working with LVM snapshots nearly impossible:
> # /sbin/lvm lvcreate --quiet -p r -L 5G -s -n .data.backup vg01/data
> Internal error: Performing unsafe table load while 2 device(s) are known to
> be suspended: (253:46)
That internal error message has been added in lvm2 v2.02.86 to reveal situations which might cause problems under some conditions we might run into.
The patch that resolves the case you ran into (while using the "-p r" option) was added in v2.02.87 and this patch is not included in F16 build yet (http://www.redhat.com/archives/lvm-devel/2011-July/msg00090.html).
> --> 'hdparm -C' shows, that all harddrives are in active/idle state
Use "dmsetup info" instead to see device-mapper suspended state. However, even if you look at the state of suspended devices after the command is run, you could still see that all devices are fine in active state - the internall error is issued during processing of the command when one of the steps while processing could be suspending related devices.
> # /bin/mount -o ro /dev/vg01/.data.backup /tmp/localbackup.8tMCfb/ROOTMNT
> mount: /dev/mapper/vg01-data-real already mounted or
> /tmp/localbackup.8tMCfb/ROOTMNT busy
> --> ??? directory structure is /dev/vg01/.data.backup
> brw-rw----. 1 root disk 253, 31 12. Nov 05:08 /dev/dm-31
> lrwxrwxrwx. 1 root root 8 13. Nov 11:46 /dev/vg01/.data.backup ->
> why is there used '/dev/mapper/vg01-data-real'?
Can you post the content of /dev/mapper directory and the list of mountpoints (output of "mount") when this happens?
> # lvremove /dev/vg01/.data.backup
> Do you really want to remove active logical volume .data.backup? [y/n]: y
> LV vg01/.data.backup in use: not deactivating
> Unable to deactivate logical volume ".data.backup"
> --> this issue exists since fedora 12; when can we expect a solution?
See bug #753105 comment #1 for further explanation...
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