Checking the LUNS when clusterware arises
Version of the grid: 11.2.0.3.6
Platform: Oracle Enterprise Linux 6.2
In our 2 bow TIE, Node2 got expelled. Once started Node2 CRS did not start. I couldn't find anything significant in the alert.log, ocssd.log or crsd.log grid.
In node2, I was able to do fdisk-l on all LUNS in the diskgroup OCR_VOTE. After a few hours of headaches and escalations, we discovered that LUNS were not really accessible to the clusterware in Node2, although fdisk-l has been correctly showing the partition.
When the cluster is down, I wanted to check if the drive to vote was really accessible to the CRS (GI), but I couldn't (as shown below).
#. / crsctl start crs
CRS-4640: Oracle high availability Services is already active
CRS-4000: Start command has failed, or completed with errors.
#. / crsctl query css votedisk
Unable to communicate with the Cluster synchronization service daemon.
How can I check if the drive to vote is accessible to the RSC in a knot when the CRS is down?
There are 2 layers necessary for the start of the CRS.
Storage. IMO, multipath is required for managing the storage of cluster at the physical level. To check if the storage is available, use the multipath-l for a list of the devices command. I usually use multipath-l | grep
[root@xx-rac01 ~] # multipath-l | grep VRAID | Sorting
VNX-LUN0 (360060160abf02e00f8712272de99e111) dm-8 DGC, VRAID
VNX-LUN1 (360060160abf02e009050a27bde99e111) dm-3 DGC, VRAID
VNX-LUN2 (360060160abf02e009250a27bde99e111) dm-9 DGC, VRAID
VNX-LUN3 (360060160abf02e009450a27bde99e111) dm-4 DGC, VRAID
VNX-LUN4 (360060160abf02e009650a27bde99e111) dm-0 DGC, VRAID
VNX-LUN5 (360060160abf02e009850a27bde99e111) dm-5 DGC, VRAID
VNX-LUN6 (360060160abf02e009a50a27bde99e111) dm-1 DGC, VRAID
VNX-LUN7 (360060160abf02e009c50a27bde99e111) dm-6 DGC, VRAID
VNX-LUN8 (360060160abf02e009e50a27bde99e111) dm-2 DGC, VRAID
VNX-LUN9 (360060160abf02e00a050a27bde99e111) dm-7 DGC, VRAID
If the number of LUNS is bad and one or more LUNS are missing, I would check the logs to begin. You can also run a multichannel flush and rediscovering (and up to the fi level of verbosity errors are thrown).
If all LUNS are there, check the device permissions and make sure that the pile of s/w Oracle has access.
The other layer which needs to work is the interconnection. There are 2 basis points to check. The interface for local interconnection exist? This can be verified using ifconfig. And communicate this interface for interconnection with interfaces for interconnection of the other cluster node? This can be checked by using ping - or if Infiniband is used, via the ibhost and other orders of ib.
So if the CRS does not start - these 2 controls (storage and interconnection) would be my first port of call, as in my experience most of the time one of these 2 layers failed.
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