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Try having a look at the storage system. We've had this in the past and in the end it narrowed down to a controller issue on our array.
Also, an upgrade to U2 wouldn't hurt... And make sure you also open a support request to VMware so you have everything covered.
thanks a lot Xeonel
what do you mean by controller issue? firmware? faulty controller?
Ok, I managed to get a bit more information. The issue I was telling you about happened on a vmware environment in a different location. I just had a quick talk with my colleagues and got an update.
Digging through the logs on all hosts, it was noticed that the issue appeared on all hosts in the cluster. According to vmware technical support, this indicated a storage related issue (SAN fabric or array itself). As a consequence, one of the array controllers was replaced (it was an IBM DS 4200).
However, my colleagues reported that the issue did not stop there and resurfaced a bit later. If I get any more information on the topic, I'll let you know asap. At this point I'd recommend opening a support case with vmware immediately so they can also look into this.
Xeonel - were you able to find any further information on this? I have the same issue with a IBM DS4800. I've had an open ticket with both IBM and VMware for weeks, but we are having problems making progress.
I know this thread is old, but did either of you ever find a resolution. Having this problem on ESXi 4.1 U2 (latest build).
I am currently out of the office, with only limited access to my e-mail.
I will be returning on Tuesday, the 24th of July 2012.