Here is my problem
I have 4 ESX 3.01 servers with 13 x 500gb SAN drives presented to all servers. For each of the 4 ESX boxes on the config tab \ storage adapters I see ALL the luns presented to the servers. When I view the congif tab \ Storage (SCSI, SAN, and NFS) I see all 13 luns on only 2 of the 4 server. From the other 2 servers I only see 12 luns presented to the servers. The missing LUNS were working fine last night around 10:00pm. Today at 08:30am is when the LUN went missing. Can I just add the storage back to the server without formatting the LUN??
Is this a Hitachi rebrand unit (Active/Active SP's). If so - are you using fixed pathing instead of the default of "mru"? What happens if you scan or list the luns from the host cli (esxcfg-mpath -l | more or esxcfg-rescan vmhba#)?
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Found the problem. One of our servers was having a problem writing Metadata to the lun in question. It had a lock on the LUN. Once that problem was fixed the LUN came back to all ESX servers.
I want to thank all who responed to my posting.