Re: [Users] "Volume Group does not exist". Blame device-mapper ?

Hi, oVirt 3.3, no big issue since the recent snapshot joke, but all in all running fine. All my VM are stored in a iSCSI SAN. The VM usually are using only one or two disks (1: system, 2: data) and it is OK. Friday, I created a new LUN. Inside a VM, I linked to it via iscsiadm and successfully login to the Lun (session, automatic attach on boot, read, write) : nice. Then after detaching it and shuting down the MV, and for the first time, I tried to make use of the feature "direct attach" to attach the disk directly from oVirt, login the session via oVirt. I connected nice and I saw the disk appear in my VM as /dev/sda or whatever. I was able to mount it, read and write. Then disaster stoke all this : many nodes suddenly began to become unresponsive, quickly migrating their VM to the remaining nodes. Hopefully, the migrations ran fine and I lost no VM nor downtime, but I had to reboot every concerned node (other actions failed). In the failing nodes, /var/log/messages showed the log you can read in the end of this message. I first get device-mapper warnings, then the host unable to collaborate with the logical volumes. The 3 volumes are the three main storage domains, perfectly up and running where I store my oVirt VMs. My reflexions : - I'm not sure device-mapper is to blame. I frequently see device mapper complaining and nothing is getting worse (not oVirt specifically) - I have not change my network settings for months (bonding, linking...) The only new factor is the usage of direct attach LUN. - This morning I was able to reproduce the bug, just by trying again this attachement, and booting the VM. No mounting of the LUN, just VM booting, waiting, and this is enough to crash oVirt. - when the disaster happens, usually, amongst the nodes, only three nodes gets stroke, the only one that run VMs. Obviously, after migration, different nodes are hosting the VMs, and those new nodes are the one that then get stroke. This is quite reproductible. And frightening. The log : Jan 20 10:20:45 serv-vm-adm11 kernel: device-mapper: table: 253:36: multipath: error getting device Jan 20 10:20:45 serv-vm-adm11 kernel: device-mapper: ioctl: error adding target to table Jan 20 10:20:45 serv-vm-adm11 kernel: device-mapper: table: 253:36: multipath: error getting device Jan 20 10:20:45 serv-vm-adm11 kernel: device-mapper: ioctl: error adding target to table Jan 20 10:20:47 serv-vm-adm11 vdsm TaskManager.Task ERROR Task=`847653e6-8b23-4429-ab25-257538b35293`::Unexpected error#012Traceback (most recent call last):#012 File "/usr/share/vdsm/storage/task.py", line 857, in _run#012 return fn(*args, **kargs)#012 File "/usr/share/vdsm/logUtils.py", line 45, in wrapper#012 res = f(*args, **kwargs)#012 File "/usr/share/vdsm/storage/hsm.py", line 3053, in getVolumeSize#012 volUUID, bs=1))#012 File "/usr/share/vdsm/storage/volume.py", line 333, in getVSize#012 mysd = sdCache.produce(sdUUID=sdUUID)#012 File "/usr/share/vdsm/storage/sdc.py", line 98, in produce#012 domain.getRealDomain()#012 File "/usr/share/vdsm/storage/sdc.py", line 52, in getRealDomain#012 return self._cache._realProduce(self._sdUUID)#012 File "/usr/share/vdsm/storage/sdc.py", line 122, in _realProduce#012 domain = self._findDomain(sdUUID)#012 File "/usr/share/vdsm/storage/sdc.py", line 141, in _findDomain#012 dom = findMethod(sdUUID)#012 File "/usr/share/vdsm/storage/blockSD.py", line 1288, in findDomain#012 return BlockStorageDomain(BlockStorageDomain.findDomainPath(sdUUID))#012 File "/usr/share/vdsm/storage/blockSD.py", line 414, in __init__#012 lvm.checkVGBlockSizes(sdUUID, (self.logBlkSize, self.phyBlkSize))#012 File "/usr/share/vdsm/storage/lvm.py", line 976, in checkVGBlockSizes#012 raise se.VolumeGroupDoesNotExist("vg_uuid: %s" % vgUUID)#012VolumeGroupDoesNotExist: Volume Group does not exist: ('vg_uuid: 1429ffe2-4137-416c-bb38-63fd73f4bcc1',) Jan 20 10:20:47 serv-vm-adm11 ¿<11>vdsm vm.Vm ERROR vmId=`2c0bbb51-0f94-4bf1-9579-4e897260f88e`::Unable to update the volume 80bac371-6899-4fbe-a8e1-272037186bfb (domain: 1429ffe2-4137-416c-bb38-63fd73f4bcc1 image: a5995c25-cdc9-4499-b9b4-08394a38165c) for the drive vda Jan 20 10:20:48 serv-vm-adm11 vdsm TaskManager.Task ERROR Task=`886e07bd-637b-4286-8a44-08dce5c8b207`::Unexpected error#012Traceback (most recent call last):#012 File "/usr/share/vdsm/storage/task.py", line 857, in _run#012 return fn(*args, **kargs)#012 File "/usr/share/vdsm/logUtils.py", line 45, in wrapper#012 res = f(*args, **kwargs)#012 File "/usr/share/vdsm/storage/hsm.py", line 3053, in getVolumeSize#012 volUUID, bs=1))#012 File "/usr/share/vdsm/storage/volume.py", line 333, in getVSize#012 mysd = sdCache.produce(sdUUID=sdUUID)#012 File "/usr/share/vdsm/storage/sdc.py", line 98, in produce#012 domain.getRealDomain()#012 File "/usr/share/vdsm/storage/sdc.py", line 52, in getRealDomain#012 return self._cache._realProduce(self._sdUUID)#012 File "/usr/share/vdsm/storage/sdc.py", line 122, in _realProduce#012 domain = self._findDomain(sdUUID)#012 File "/usr/share/vdsm/storage/sdc.py", line 141, in _findDomain#012 dom = findMethod(sdUUID)#012 File "/usr/share/vdsm/storage/blockSD.py", line 1288, in findDomain#012 return BlockStorageDomain(BlockStorageDomain.findDomainPath(sdUUID))#012 File "/usr/share/vdsm/storage/blockSD.py", line 414, in __init__#012 lvm.checkVGBlockSizes(sdUUID, (self.logBlkSize, self.phyBlkSize))#012 File "/usr/share/vdsm/storage/lvm.py", line 976, in checkVGBlockSizes#012 raise se.VolumeGroupDoesNotExist("vg_uuid: %s" % vgUUID)#012VolumeGroupDoesNotExist: Volume Group does not exist: ('vg_uuid: 1429ffe2-4137-416c-bb38-63fd73f4bcc1',) Jan 20 10:20:48 serv-vm-adm11 ¿<11>vdsm vm.Vm ERROR vmId=`2c0bbb51-0f94-4bf1-9579-4e897260f88e`::Unable to update the volume ea9c8f12-4eb6-42de-b6d6-6296555d0ac0 (domain: 1429ffe2-4137-416c-bb38-63fd73f4bcc1 image: f42e0c9d-ad1b-4337-b82c-92914153ff44) for the drive vdb Jan 20 10:21:03 serv-vm-adm11 vdsm TaskManager.Task ERROR Task=`27bb14f9-0cd1-4316-95b0-736d162d5681`::Unexpected error#012Traceback (most recent call last):#012 File "/usr/share/vdsm/storage/task.py", line 857, in _run#012 return fn(*args, **kargs)#012 File "/usr/share/vdsm/logUtils.py", line 45, in wrapper#012 res = f(*args, **kwargs)#012 File "/usr/share/vdsm/storage/hsm.py", line 3053, in getVolumeSize#012 volUUID, bs=1))#012 File "/usr/share/vdsm/storage/volume.py", line 333, in getVSize#012 mysd = sdCache.produce(sdUUID=sdUUID)#012 File "/usr/share/vdsm/storage/sdc.py", line 98, in produce#012 domain.getRealDomain()#012 File "/usr/share/vdsm/storage/sdc.py", line 52, in getRealDomain#012 return self._cache._realProduce(self._sdUUID)#012 File "/usr/share/vdsm/storage/sdc.py", line 122, in _realProduce#012 domain = self._findDomain(sdUUID)#012 File "/usr/share/vdsm/storage/sdc.py", line 141, in _findDomain#012 dom = findMethod(sdUUID)#012 File "/usr/share/vdsm/storage/blockSD.py", line 1288, in findDomain#012 return BlockStorageDomain(BlockStorageDomain.findDomainPath(sdUUID))#012 File "/usr/share/vdsm/storage/blockSD.py", line 414, in __init__#012 lvm.checkVGBlockSizes(sdUUID, (self.logBlkSize, self.phyBlkSize))#012 File "/usr/share/vdsm/storage/lvm.py", line 976, in checkVGBlockSizes#012 raise se.VolumeGroupDoesNotExist("vg_uuid: %s" % vgUUID)#012VolumeGroupDoesNotExist: Volume Group does not exist: ('vg_uuid: 83d39199-d4e4-474c-b232-7088c76a2811',)