Hi Everyone,
I inadvertently created a situation where I deleted an LVM snapshot that
was pending a merge (yes - bonehead move). Now I can neither finish the
merge nor create a new snapshot on the original logical volume. When I
try to create a snapshot I get the following:root@ubuntu:~# lvcreate -s -n snap -L 15g /dev/sysvg/syslv Snapshots of an origin that has a merging snapshot is not supported
Nov 21 20:32:47 ubuntu kernel: [ 721.210733] device-mapper: snapshots: Snapshot is marked invalid. Nov 21 20:32:47 ubuntu kernel: [ 721.211641] device-mapper: snapshots: Snapshot is invalid: can't merge Nov 21 20:32:47 ubuntu kernel: [ 721.233283] Buffer I/O error on device dm-4, logical block 16 Nov 21 20:32:47 ubuntu kernel: [ 721.233289] Buffer I/O error on device dm-4, logical block 16
This is not surprising as I did an
lvremove of the snapshot (oops). If I do an lvscan I get the following output:root@ubuntu:~# lvscan ACTIVE '/dev/uservg/userlv' [931.50 GiB] inherit inactive Original '/dev/sysvg/syslv' [152.77 GiB] inherit
And
And
I have looked extensively on the intertubes and either my google kung-fu is slipping or I have reached toxic levels of caffeine (or both) and can't find much. Does anyone have any advice about how to restore LVM snapshoting for me?
lvdisplay showsroot@ubuntu:/# lvdisplay /dev/sysvg/syslv
--- Logical volume ---
LV Path /dev/sysvg/syslv
LV Name syslv
VG Name sysvg
LV UUID stuff here
LV Write Access read/write
LV Creation host, time hades, 2014-07-09 14:56:49 +0000
LV snapshot status source of
pre-x [INACTIVE]
LV Status available
# open 0
LV Size 152.77 GiB
Current LE 39108
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:3So the snapshot status is INACTIVE and is trying to merge but I have no idea how to make LVM try to stop attempting the merge. I can mount and use the logical volume without apparent problem, but I really would like to be able to take a snapshot (which is why I wanted to use LVM in the first place!)
I think that I need to us a lower level tool like dmsetup to accomplish this but I am not sure how to use this tool and would prefer not to blow away root if possible (not the end of the world, but would prefer not too). With dmsetup I have the following info:
root@ubuntu:/# dmsetup status /dev/sysvg/syslv 0 320372736 snapshot-merge Invalid
And
root@ubuntu:/# dmsetup info /dev/sysvg/syslv Name: sysvg-syslv State: ACTIVE Read Ahead: 256 Tables present: LIVE Open count: 0 Event number: 0 Major, minor: 252, 3 Number of targets: 1 UUID: stuff here
I have looked extensively on the intertubes and either my google kung-fu is slipping or I have reached toxic levels of caffeine (or both) and can't find much. Does anyone have any advice about how to restore LVM snapshoting for me?
System:
LVM info:
root@hades:~$ uname -a Linux hades 3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:30:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
LVM info:
root@ubuntu:/# lvm version LVM version: 2.02.98(2) (2012-10-15) Library version: 1.02.77 (2012-10-15) Driver version: 4.27.0
TIA
- chook
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