Re: Throughput drops with VMware GFS2 cluster when using fence_scsi

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<Responding to myself for benefit of the list>

This looks like it was caused by the device mapping defaulting to a
round-robin path selection policy.  While I couldn't find any mention
of it in the RedHat cluster documentation, I did see some MSCS
postings[1] that said:

Round Robin can interfere with applications that use SCSI reservations
for sharing LUNs among VMs and thus is not supported with the use of
LUNs with MSCS.

so I changed the policy to "Most Recently Used" and was able to get
sustained writes of 40MB/s and sustained reads of 100MB/s down one



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