vSphere virtual machines stop responding

Matthijs Haverink writes on his blog at his site virtualfuture.info about an incident at a customer site.

Last month I was on-site at one of my customers and experienced a major problem on the vSphere environment. We suddenly experienced about 150 virtual servers running on 16 hosts in 2 clusters (on the same SAN) going in jabber-mode. They froze, which made them unavailable for pings and other traffic. The freeze moment varied from 1 to 30 seconds. After that the VM’s went back on-line again. This seemed to happen in groups of about 10 to 30 VM’s.

It was found out that this problem was caused by a deletion of a LUN without performing a rescan of the storage.

More info on the links below.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1016626

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1015084

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