Why you should not use NMP/round robin MPIO with MSCS in ESXi <; 5.5?
There, could someone explain to me why MSCS do not work well with turnstile NMP on ESXi < v5.5? Best explanation I've seen is that each path is "seen" differently by the guest operating system continuously, send commands to reset and SCSI reservation everything slow. No doubt this could complicate situations requiring a turnaround as well...
Looking for a good explanation - which would also help me to understand how it "works" in ESXi 5.5 + now.
According to Cormac Hogan:
In the past, political path of round robin might not supported on MSCS shared storage. It was because of the inability to release SCSI reservations on some routes when the reserve has been placed on a different path on the same disk. With the release of vSphere 5.5, this problem has now been addressed and we support RR on storage that is consumed by the MSCS nodes.
Tags: VMware
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