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I occasionally see Lost connectivity to storage device errors on my vCenter server. I've investigated and found no connectivity problems at all. These errors stop generating after I reboot the vCenter server. My Compellent iSCSI SAN is not showing any problems. Strangely, it always seems to be being reported by one of my ESX servers that was updated from ESX 3.5. The other server in my cluster started on 4.0. Could there be any correlation?

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Are you on VCenter 4? which device reports the error - an ESX host or the VCentre itself? – Chopper3 Feb 16 '10 at 13:20
Thank you. Errors are from my vcenter4. – mcsovi Feb 16 '10 at 13:27
Since this is not a "real" solution I'll just comment it: Best-practice when it comes to upgrading ESX servers is to wipe them clean and install ESX from scratch again. VMware will of course say that upgrading is fully supported and will work great(tm), but the general experience from all vmware admins is to install from scratch as long your VM's reside on a SAN. – pauska Feb 16 '10 at 13:50
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