How to clear UDID mismatch in VCS Cluster(online thinrclm udid_mismatch)?

In this post, we are going to see How to clear UDID mismatch in VCS Cluster(online thinrclm udid_mismatch)?

We are doing this activity in VCS 3 node cluster with Linux environment.

In VCS Cluster udid_mismtach might lead to disk failures.

Error:
#vxdisk -l alldgs list | grep udid
emc4_184a auto:cdsdisk   -   (vxfendg)   online thinrclm udid_mismatch
emc4_184b auto:cdsdisk   -   (vxfendg)   online thinrclm udid_mismatch
emc4_184c auto:cdsdisk   -   (vxfendg)   online thinrclm udid_mismatch
Resolution:

Verify the fencing disks using “vxdisk -l alldgs list | grep udid” command to know whether it’s having udid_mismatch or not. Using that command we came to know all the three fencing disks has udid_mismatch.

#vxdisk -l alldgs list | grep udid
emc4_184a auto:cdsdisk   -   (vxfendg)   online thinrclm udid_mismatch
emc4_184b auto:cdsdisk   -   (vxfendg)   online thinrclm udid_mismatch
emc4_184c auto:cdsdisk   -   (vxfendg)   online thinrclm udid_mismatch

Verify the all 3 disks udid and udid_asl values are different or not.

Using below command we found that, udid & udid_mismatch values are different.

#vxdisk -v list emc4_184a | grep -i udid 
flags:   online  ready  private autoconfig udid_mismatch coordinator thinrclm 
udid:   EMC%5FSYMMETRIX%5FF000197500111%5F110184A008 
tag:     udid_asl=EMC%5FSYNNETRIX%5F000195702690%5F9002F64000

How to clear UDID mismatch in VCS Cluster(online thinrclm udid_mismatch)?

 

Like the above use the same command to check udid & udid_mismatch values for another two disks(emc4_184b, emc4_184c)

Then check whether the fencing keys on the coordinator disks are fine using below command

#vxfenadm -s /dev/vx/rdmp/emc4_184a

All the fencing keys are looking good on the coordinator disks.

How to clear UDID mismatch in VCS Cluster(online thinrclm udid_mismatch)?

Finally, command to clear the udid_mismatch flag from all 3 fencing disks.

#vxdisk updateudid emc4_184a

#vxdisk updateudid emc4_184b

#vxdisk updateudid emc4_184c

Confirm udid_mismatch has been cleared or not using the below command.

#vxdisk -o alldgs list | grep -i udid

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