[linux-lvm] [lvmlockd] "Duplicate sanlock global locks" warned but not found in "lvmlockctl -i"

[Damon Wang]

Hi all,

I found duplicate sanlock locks in lvm operation:

[***@172-20-11-108 ~]# vgs
Duplicate sanlock global locks should be corrected
Duplicate sanlock global lock in VG 9e9e5a689750430daff18da75c9718cc
Couldn't find device with uuid 7oDKl3-TvVY-Q24z-Q2BC-psUZ-SFCX-j1fhQE.
Duplicate sanlock global lock in VG 8c32e39f49024e64832c1bc3fd15f948
VG #PV #LV #SN Attr VSize VFree
8c32e39f49024e64832c1bc3fd15f948 4 80 0 wz--ns <291.88g <263.32g
9e9e5a689750430daff18da75c9718cc 3 55 0 wz-pns 739.93g <702.65g
zstack 1 2 0 wz--n- <59.00g 0

while lvmlockctl -i:

[***@172-20-11-108 ~]# lvmlockctl -i
VG 8c32e39f49024e64832c1bc3fd15f948 lock_type=sanlock
npweb0-UQs8-hviS-PA8L-mOgI-eMDO-qY5OpK
LS sanlock lvm_8c32e39f49024e64832c1bc3fd15f948
LK VG un ver 229
LK GL un ver 1
LK LV un nvnmw0-WMeY-nm4V-zEfl-Dcpc-bGJr-rL8gpG
LK LV sh hGVNWa-wwFx-SsQJ-Y6t4-UvPJ-CKEq-1CICng
LK LV ex YtvSmz-Mo7H-gQnV-QfLp-Pb9P-HXpO-Fw3iDZ
... ...
LK LV ex sUUEqr-B38J-Cktj-fky0-g5he-xS3o-wq9Lor
LK LV ex k943Uw-du21-EOg0-F1t5-NKrH-aPof-Wt37Mi

VG 9e9e5a689750430daff18da75c9718cc lock_type=sanlock
JBTlB1-fjbM-YpOc-6Qnt-Spxj-nEM4-oQaBCT
LS sanlock lvm_9e9e5a689750430daff18da75c9718cc
LK VG un ver 208
LK LV sh rnb8Lc-XbBu-dqPn-kfNC-SsW4-F9KF-nK6fsu
LK LV un YftJt5-1G9S-0icO-HkbU-7vqL-OPrZ-ppO8WO

It seems not harmful, but I don't know why it happen.

Thanks,
Damon

[David Teigland]

Post by Damon Wang
Hi all,
Duplicate sanlock global locks should be corrected
Duplicate sanlock global lock in VG 9e9e5a689750430daff18da75c9718cc
Couldn't find device with uuid 7oDKl3-TvVY-Q24z-Q2BC-psUZ-SFCX-j1fhQE.
Duplicate sanlock global lock in VG 8c32e39f49024e64832c1bc3fd15f948
VG #PV #LV #SN Attr VSize VFree
8c32e39f49024e64832c1bc3fd15f948 4 80 0 wz--ns <291.88g <263.32g
9e9e5a689750430daff18da75c9718cc 3 55 0 wz-pns 739.93g <702.65g
zstack 1 2 0 wz--n- <59.00g 0
It seems not harmful, but I don't know why it happen.

It can be harmful if different hosts use different global locks.
There's a section in lvmlockd man page about how this happens and
how to correct it. In short, it happens when you create a new sanlock VG
while the other one is not visible. To correct it, you disable the global
lock in one of the VGs with 'lvmlockctl --gl-disable <vgname>'.

Dave

[Damon Wang]

Hi,

Thank you for your reply.

I’m wonder why I see only one global lock in lvmlockctl -i, should I got multiple gl lock in lvmlock -i when it warn “duplicate gl lock”？

Thanks！
Damon

Post by David Teigland

Post by Damon Wang
Hi all,
Duplicate sanlock global locks should be corrected
Duplicate sanlock global lock in VG 9e9e5a689750430daff18da75c9718cc
Couldn't find device with uuid 7oDKl3-TvVY-Q24z-Q2BC-psUZ-SFCX-j1fhQE.
Duplicate sanlock global lock in VG 8c32e39f49024e64832c1bc3fd15f948
VG #PV #LV #SN Attr VSize VFree
8c32e39f49024e64832c1bc3fd15f948 4 80 0 wz--ns <291.88g <263.32g
9e9e5a689750430daff18da75c9718cc 3 55 0 wz-pns 739.93g <702.65g
zstack 1 2 0 wz--n- <59.00g 0
It seems not harmful, but I don't know why it happen.

It can be harmful if different hosts use different global locks.
There's a section in lvmlockd man page about how this happens and
how to correct it. In short, it happens when you create a new sanlock VG
while the other one is not visible. To correct it, you disable the global
lock in one of the VGs with 'lvmlockctl --gl-disable <vgname>'.
Dave

[David Teigland]

Post by Damon Wang
I’m wonder why I see only one global lock in lvmlockctl -i, should I got
multiple gl lock in lvmlock -i when it warn “duplicate gl lock”？

lvmlockctl is showing you the one global lock that lvmlockd is using, and
the vgs command is showing you all the global locks that it sees on disk.
Just disable the global lock that is not being used (the one not in
lvmlockctl) with lvmlockctl --gl-disable and the warning should disappear.

Dave

[Damon Wang]

Got it, thanks a lot!

Damon

Post by David Teigland

Post by Damon Wang
I’m wonder why I see only one global lock in lvmlockctl -i, should I got
multiple gl lock in lvmlock -i when it warn “duplicate gl lock”？

lvmlockctl is showing you the one global lock that lvmlockd is using, and
the vgs command is showing you all the global locks that it sees on disk.
Just disable the global lock that is not being used (the one not in
lvmlockctl) with lvmlockctl --gl-disable and the warning should disappear.
Dave