Saturday, January 19, 2013

MSCS RDMs causing long boot of ESX

That's because RDM LUN attached to MSCS cluster has permanent SCSI reservation initiated by active node of cluster.

In ESX 5 you have to mark all such LUNs as perennially reserved and your ESX boot can be fast as usual.

Here is CLI command to mark LUN
esxcli storage core device setconfig -d --perennially-reserved=true

This has to be changed on all ESX hosts with visibility to the LUN.

More info at

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