[linux-lvm] lvmlockd: how to convert lock_type from sanlock to dlm?

[Eric Ren]

David,

> First you'll need this recent fix:
> https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=f611b68f3c02b9af2521d7ea61061af3709fe87c
>
> --force was broken at some point, and the option is now --lockopt force.

Thanks!

> To change between lock types, you are supposed to be able to change to a
> local VG, then from local to the other lock type.  The man page sections:
>
>    changing a lockd VG to a local VG
>    changing a local VG to a lockd VG
>
> But it looks like a fix is needed in those instructions.  I believe
> "vgchange --lock-type none <vgname>" needs to include --lockopt force.
> If you could verify this for me, I'll update the man page.

It works! I did as the following:

"""
sle15-c1-n1:~ # vgs
   Reading VG vg1 without a lock.
   VG  #PV #LV #SN Attr   VSize  VFree
   vg1   1   1   0 wz--ns 19.97g 18.72g
sle15-c1-n1:~ # vgchange --lock-type none vg1
   Cannot access VG vg1 due to failed lock.
sle15-c1-n1:~ # vgchange --lock-type none --lockopt force vg1
Forcibly change VG lock type to none? [y/n]: y
   Volume group "vg1" successfully changed
sle15-c1-n1:~ # vgchange --lock-type dlm vg1
   Volume group "vg1" successfully changed
sle15-c1-n1:~ # vgs
   Reading VG vg1 without a lock.
   VG  #PV #LV #SN Attr   VSize  VFree
   vg1   1   1   0 wz--ns 19.97g 18.72g
sle15-c1-n1:~ # vgs -o+lock_type
   Reading VG vg1 without a lock.
   VG  #PV #LV #SN Attr   VSize  VFree  LockType
   vg1   1   1   0 wz--ns 19.97g 18.72g dlm
sle15-c1-n1:~ # vgchange --lockstart
   VG vg1 starting dlm lockspace
   Starting locking.  Waiting until locks are ready...
sle15-c1-n1:~ # lvs
   LV   VG  Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync 
Convert
   lv1  vg1 -wi------- 1.00g
"""

Thanks,
Eric