Dear Ala,

if you have a few minutes for me I'd like to ask you to read my issue.
It's a strange problem because my vm works fine but I can't delete its snapshoot.
Thanks a lot
Best Regards
Enrico


-------- Messaggio Inoltrato --------

Oggetto:	[ovirt-users] Re: Cannot acquire Lock .... snapshot error
Data:	Mon, 25 Jun 2018 14:20:21 +0200
Mittente:	Enrico Becchetti <enrico.becchetti@pg.infn.it>
A:	Nir Soffer <nsoffer@redhat.com>
CC:	users <users@ovirt.org>

 Dear Friends ,
to fix my problem I've try vdsm-tool command but it's seem an error:

[root@infn-vm05 vdsm]# vdsm-tool check-volume-lease
Usage: /usr/bin/vdsm-tool [options] <action> [arguments]
Valid options:
......

as you can see there isn't check-volumes-option  and my ovirt engine is already at 4.2.
Any other ideas ?
Thanks a lot !
Best Regards
Enrico



Il 22/06/2018 17:46, Nir Soffer ha scritto:

On Fri, Jun 22, 2018 at 3:13 PM Enrico Becchetti <enrico.becchetti@pg.infn.it> wrote:

 Dear All,
my ovirt 4.2.1.7-1.el7.centos has three hypervisors, lvm storage and virtiual machine with
ovirt-engine. All works fine but with one vm when I try to remove its snapshot I have
this error:

2018-06-22 07:35:48,155+0200 INFO  (jsonrpc/5) [vdsm.api] START prepareMerge(spUUID=u'18d57688-6ed4-43b8-bd7c-0665b55950b7', subchainInfo={u'img_id': u'c5611862-6504-445e-a6c8-f1e1a95b5df7', u'sd_id': u'47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5', u'top_id': u'0e6f7512-871d-4645-b9c6-320ba7e3bee7', u'base_id': u'e156ac2e-09ac-4e1e-a139-17fa374a96d4'}) from=::ffff:10.0.0.46,53304, flow_id=07011450-2296-4a13-a9ed-5d5d2b91be98, task_id=87f95d85-cc3d-4f29-9883-a4dbb3808f88 (api:46)
2018-06-22 07:35:48,406+0200 INFO  (tasks/3) [storage.merge] Preparing subchain <SubchainInfo sd_id=47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5, img_id=c5611862-6504-445e-a6c8-f1e1a95b5df7, top_id=0e6f7512-871d-4645-b9c6-320ba7e3bee7, base_id=e156ac2e-09ac-4e1e-a139-17fa374a96d4 base_generation=None at 0x7fcf84ae2510> for merge (merge:177)
2018-06-22 07:35:48,614+0200 INFO  (tasks/3) [storage.SANLock] Acquiring Lease(name='e156ac2e-09ac-4e1e-a139-17fa374a96d4', path='/dev/47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5/leases', offset=115343360) for host id 1 (clusterlock:377)
2018-06-22 07:35:48,634+0200 ERROR (tasks/3) [storage.guarded] Error acquiring lock <VolumeLease ns=04_lease_47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5, name=e156ac2e-09ac-4e1e-a139-17fa374a96d4, mode=exclusive at 0x7fcfe09ddf90> (guarded:96)
AcquireLockFailure: Cannot obtain lock: "id=47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5, rc=-227, out=Cannot acquire Lease(name='e156ac2e-09ac-4e1e-a139-17fa374a96d4', path='/dev/47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5/leases', offset=115343360), err=(-227, 'Sanlock resource not acquired', 'Lease resource name is incorrect')"
2018-06-22 07:35:56,881+0200 INFO  (jsonrpc/7) [vdsm.api] FINISH getAllTasksStatuses return={'allTasksStatus': {'87f95d85-cc3d-4f29-9883-a4dbb3808f88': {'code': 651, 'message': 'Cannot obtain lock: "id=47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5, rc=-227, out=Cannot acquire Lease(name=\'e156ac2e-09ac-4e1e-a139-17fa374a96d4\', path=\'/dev/47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5/leases\', offset=115343360), err=(-227, \'Sanlock resource not acquired\', \'Lease resource name is incorrect\')"', 'taskState': 'finished', 'taskResult': 'cleanSuccess', 'taskID': '87f95d85-cc3d-4f29-9883-a4dbb3808f88'}}} from=::ffff:10.0.0.46,53136, task_id=d0e2f4e3-90cb-43c6-aa08-98d1f7efb1bd (api:52)

The issue is corrupted lease for this volume:

AcquireLockFailure: Cannot obtain lock: "id=47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5, rc=-227, out=Cannot acquire Lease(name='e156ac2e-09ac-4e1e-a139-17fa374a96d4', path='/dev/47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5/leases', offset=115343360), err=(-227, 'Sanlock resource not acquired', 'Lease resource name is incorrect')"

This root cause is faulty merge code in ovirt < 4.1, creating volume leases with

incorrect name. These corrupted leases were not detected until you upgrade to

ovirt >= 4.1, because we started to use volume leases for storage operations.

The fix is to run

    vdsm-tool check-volume-leases

This will check and repair corrupted leases.

Adding Ala to add more info if needed.

Nir

-- 
_______________________________________________________________________

Enrico Becchetti                    Servizio di Calcolo e Reti

Istituto Nazionale di Fisica Nucleare - Sezione di Perugia
Via Pascoli,c/o Dipartimento di Fisica  06123 Perugia (ITALY)
Phone:+39 075 5852777             Mail: Enrico.Becchetti<at>pg.infn.it
______________________________________________________________________