We have a file cluster on Server 2012 R2 (Fully updated) with a RDM passthrough disk to a Dell Compellent SAN using VMWare ESXi 5.5. Pathing is set to MRU for the RDM.
We lost access to the cluster volume and in failover cluster manager where it would normally display the drive letter of the volume with name, it was showing the GUID and reporting 'Unknown'. Failing over to the other node resolved this. The VMWare VM/Host logs show no drops in connectivity nor does the SAN report an issue. This a fibre channel SAN, not iSCSI.
The logs at the time on the cluster node that was active say the following:
[RES] Physical Disk: Failed to open device \Device\Harddisk2\ClusterPartition1, status 0xc0000034
[RES] Physical Disk: HarddiskpIsPartitionHidden: failed to open device \Device\Harddisk2\ClusterPartition1, status 2
[RES] Physical Disk: HarddiskpIsPartitionHidden: failed to open device \Device\Harddisk2\ClusterPartition1, status 2
[RES] Physical Disk: HarddiskpIsPartitionHidden: failed to open device \Device\Harddisk2\ClusterPartition1, status 2
[RES] Physical Disk: HardDiskpGetDiskInfo: GetVolumeInformation failed for \\?\GLOBALROOT\Device\Harddisk2\ClusterPartition1\, status 3
[RES] Physical Disk: HardDiskpGetDiskInfo: failed to get partition size for \\?\GLOBALROOT\Device\Harddisk2\ClusterPartition1\, status 3
We're struggling to find reasoning why this happened. Can anyone provide possible causes or where to look that may lead us to an explanation?
Thank you in advance.