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We have installed VM server 3.2.4 on a couple of servers and provisioned one RHEL 6 guest per physical. Every now and again the VM server appears to have a problem with multipathing and the attached LUNS go read only, so the guests crash. We did a default VM server install, with multipathing enabled, all our storage is SAN (emc vmax I think). When this last happened some other physical servers in the same enclosure had issues, basically they almost froze, but these servers did not crash or go read-only. I've had an SR on this, but supports answer was that we had a switch or SAN issue, nothing helpful. Any suggestions as to what I should look at? Thanks.