Hi!

Thanks. Like I wrote, I have metadata backups from /etc/lvm/backup and -/archive, and I also have the current metadata as it exists on disk. What I'm most concerned about, is the proposed procedure.

I would create a backup of the VG, but I'm not sure what would be the most sensible way to do it. I could make a new iSCSI target and simply 'dd' the whole disk over, but that would take quite some time (it's 2,5 TB) and there are VMs that can't really be down for that long. And I'm not even sure that dd'ing the disk like that is a sensible strategy.

Moving disks out of the domain is currently not possible. oVirt says 'Source Storage Domain is not active'.

Thanks,
Martijn.

Can you check the /etc/lvm/backup and /etc/lvm/archive on your SPM host (check the other hosts, just in case you find anything useful) ?

Usually LVM makes backup of everything.

I would recommend you to:

1. Create a backup of the problematic VG

2. Compare the backup file and a file from backup/archive folders for the same VG

Check what is different with diff/vimdiff . It might give you a clue.

I had some issues (non-related to oVirt) and restoring the VG from older backup did help me .Still ,any operation on block devices should be considered risky and a proper backup is needed.

You could  try to move a less important VM's disks out of this storage domain to another one.

If it succeeds - then you can evacuate all VMs away before you can start "breaking" the storage domain.

Best Regards,

Strahil Nikolov

  

В четвъртък, 18 юли 2019 г., 16:59:46 ч. Гринуич+3, Martijn Grendelman <martijn.grendelman@isaac.nl> написа:

Hi,

It appears that O365 has trouble delivering mails to this list, so two
earlier mails of mine are still somewhere in a queue and may yet be delivered.

This mail has all of the content of 3 successive mails. I apologize for this
format.

Op 18-7-2019 om 11:20 schreef Martijn Grendelman:

Op 18-7-2019 om 10:16 schreef Martijn Grendelman:

Hi,

For the first time in many months I have run into some trouble with oVirt (4.3.4.3) and I need some help.

Yesterday, I noticed one of my iSCSI storage domains was almost full, and tried to move a disk image off of it, to another domain. This failed, and somewhere in the process, the whole storage domain went to status 'Inactive'.

From engine.log:

2019-07-17 16:30:35,319+02 INFO  [org.ovirt.engine.core.vdsbroker.irsbroker.IrsProxy] (EE-ManagedThreadFactory-engine-Thread-1836383) [] starting processDomainRecovery for domain '875847b6-29a4-4419-be92-9315f4435429:HQST0_ISCSI02'.
2019-07-17 16:30:35,337+02 ERROR [org.ovirt.engine.core.vdsbroker.irsbroker.IrsProxy] (EE-ManagedThreadFactory-engine-Thread-1836383) [] Domain '875847b6-29a4-4419-be92-9315f4435429:HQST0_ISCSI02' was reported by all hosts in status UP as problematic. Moving the domain to NonOperational.
2019-07-17 16:30:35,410+02 WARN  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-1836383) [5f6fd35e] EVENT_ID: SYSTEM_DEACTIVATED_STORAGE_DOMAIN(970), Storage Domain HQST0_ISCSI02 (Data Center ISAAC01) was deactivated by system because it's not visible by any of the hosts.

The thing is, the domain is still functional on all my hosts. It carries over 50 disks, and all involved VMs are up and running, and don't seem to have any problems. Also, 'iscsiadm' on all hosts seems to indiciate that everything is fine with this specific target and reading from the device with dd, or getting its size with 'blockdev' all works without issue.

When I try to reactivate the domain, these errors are logged:

2019-07-18 09:34:53,631+02 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-43475) [79e386e] EVENT_ID: IRS_BROKER_COMMAND_FAILURE(10,803), VDSM command ActivateStorageDomainVDS failed: Storage domain does not exist: (u'875847b6-29a4-4419-be92-9315f4435429',)
2019-07-18 09:34:53,631+02 ERROR [org.ovirt.engine.core.vdsbroker.irsbroker.IrsBrokerCommand] (EE-ManagedThreadFactory-engine-Thread-43475) [79e386e] IrsBroker::Failed::ActivateStorageDomainVDS: IRSGenericException: IRSErrorException: Failed to ActivateStorageDomainVDS, error = Storage domain does not exist: (u'875847b6-29a4-4419-be92-9315f4435429',), code = 358
2019-07-18 09:34:53,648+02 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-43475) [79e386e] EVENT_ID: USER_ACTIVATE_STORAGE_DOMAIN_FAILED(967), Failed to activate Storage Domain HQST0_ISCSI02 (Data Center ISAAC01) by martijn@-authz

On the SPM host, there are errors that indicate problems with the LVM volume group:

2019-07-18 09:34:50,462+0200 INFO  (jsonrpc/2) [vdsm.api] START activateStorageDomain(sdUUID=u'875847b6-29a4-4419-be92-9315f4435429', spUUID=u'aefd5844-6e01-4070-b3b9-c0d73cc40c78', options=None) from=::ffff:172.17.1.140,56570, flow_id=197dadec, task_id=51107845-d80b-47f4-aed8-345aaa49f0f8 (api:48)
2019-07-18 09:34:50,464+0200 INFO  (jsonrpc/2) [storage.StoragePool] sdUUID=875847b6-29a4-4419-be92-9315f4435429 spUUID=aefd5844-6e01-4070-b3b9-c0d73cc40c78 (sp:1125)
2019-07-18 09:34:50,629+0200 WARN  (jsonrpc/2) [storage.LVM] Reloading VGs failed (vgs=[u'875847b6-29a4-4419-be92-9315f4435429'] rc=5 out=[] err=['  /dev/mapper/23536316636393463: Checksum error at offset 2748693688832', "  Couldn't read volume group metadata from /dev/mapper/23536316636393463.", '  Metadata location on /dev/mapper/23536316636393463 at 2748693688832 has invalid summary for VG.', '  Failed to read metadata summary from /dev/mapper/23536316636393463', '  Failed to scan VG from /dev/mapper/23536316636393463', '  Volume group "875847b6-29a4-4419-be92-9315f4435429" not found', '  Cannot process volume group 875847b6-29a4-4419-be92-9315f4435429']) (lvm:442)
2019-07-18 09:34:50,629+0200 INFO  (jsonrpc/2) [vdsm.api] FINISH activateStorageDomain error=Storage domain does not exist: (u'875847b6-29a4-4419-be92-9315f4435429',) from=::ffff:172.17.1.140,56570, flow_id=197dadec, task_id=51107845-d80b-47f4-aed8-345aaa49f0f8 (api:52)
2019-07-18 09:34:50,629+0200 ERROR (jsonrpc/2) [storage.TaskManager.Task] (Task='51107845-d80b-47f4-aed8-345aaa49f0f8') Unexpected error (task:875)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/storage/task.py", line 882, in _run
    return fn(*args, **kargs)
  File "<string>", line 2, in activateStorageDomain
  File "/usr/lib/python2.7/site-packages/vdsm/common/api.py", line 50, in method
    ret = func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/hsm.py", line 1262, in activateStorageDomain
    pool.activateSD(sdUUID)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/securable.py", line 79, in wrapper
    return method(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/sp.py", line 1127, in activateSD
    dom = sdCache.produce(sdUUID)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/sdc.py", line 110, in produce
    domain.getRealDomain()
  File "/usr/lib/python2.7/site-packages/vdsm/storage/sdc.py", line 51, in getRealDomain
    return self._cache._realProduce(self._sdUUID)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/sdc.py", line 134, in _realProduce
    domain = self._findDomain(sdUUID)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/sdc.py", line 151, in _findDomain
    return findMethod(sdUUID)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/blockSD.py", line 1807, in findDomain
    return BlockStorageDomain(BlockStorageDomain.findDomainPath(sdUUID))
  File "/usr/lib/python2.7/site-packages/vdsm/storage/blockSD.py", line 1665, in findDomainPath
    raise se.StorageDomainDoesNotExist(sdUUID)
StorageDomainDoesNotExist: Storage domain does not exist: (u'875847b6-29a4-4419-be92-9315f4435429',)
2019-07-18 09:34:50,629+0200 INFO  (jsonrpc/2) [storage.TaskManager.Task] (Task='51107845-d80b-47f4-aed8-345aaa49f0f8') aborting: Task is aborted: "Storage domain does not exist: (u'875847b6-29a4-4419-be92-9315f4435429',)" - code 358 (task:1181)
2019-07-18 09:34:50,629+0200 ERROR (jsonrpc/2) [storage.Dispatcher] FINISH activateStorageDomain error=Storage domain does not exist: (u'875847b6-29a4-4419-be92-9315f4435429',) (dispatcher:83)

I need help getting this storage domain back online. Can anyone here help me? If you need any additional information, please let me know!

It appears the VG metadata is corrupt:

  /dev/mapper/23536316636393463: Checksum error at offset 2748693688832
  Couldn't read volume group metadata from /dev/mapper/23536316636393463.
  Metadata location on /dev/mapper/23536316636393463 at 2748693688832 has invalid summary for VG.
  Failed to read metadata summary from /dev/mapper/23536316636393463
  Failed to scan VG from /dev/mapper/23536316636393463

Is this fixable? If so, how?

So, I have found some information online, that suggests that PV metadata can be fixed by recreating the PV label using the correct PVID and a backup of the LVM metadata, like so:

pvcreate -u <pv_uuid> --restorefile <lvm_metadata_backup> /dev/mapper/23536316636393463

Now I have the following two files:

• An LVM metadata backup of yesterday 10:35, about 6 hours before the problem occurred.
• The actual metadata found on the PV at offset 2748693688832 (obtained with hexedit on the block device).
  

These are largely the same, but there are differences:

• seqno = 1854 in the backup and 1865 in the actual metadata.
• 3 logical volumes that are not present in the backup, but are in the actual metadata.  I suspect that these are related to snapshots that were created for live storage migration, but I am not sure. In any case, I did NOT create any new disk images on this domain, so that can't be it.

Now, support I wanted to try the 'pvcreate' route, then:

• what would be the chances of success? Is this procedure at all advisable, or is there an alternative?
• which restore file (1854 or 1865) should I use for the restore?
• can I do this while the VG is in use? I tried running the command without --force, and it said 'Can't open /dev/mapper/23536316636393463 exclusively.  Mounted filesystem?'.  I didn't dare to try it with '--force'.

I could really use some advice on how to proceed. This are about 36 VMs that have one or more disks on this domain. I could bring them down, although doing so for extended amounts of time would be problematic. I want to be careful, obviously, especially since the actual storage doesn't seem to be impacted at this time. The VMs are all still running without issue, and if I'm about to embark on a dangerous journey that could cause data loss, I need a contingency / recovery plan.

Hoping someone can help...

Best regards,

Martijn Grendelman

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