Dell PowerEdge 2950 III, PERC6/i, 2x144GB SAS drives in RAID1 used only for booting ESX 4.1. For a while now, it's been logging the following message once every few days: Unexpected sense.

With the release of the 13th-generation PowerEdge R730xd, Dell ... enclosure. [ Also reviewed on InfoWorld: VMware Virtual SAN turns storage inside-out | 10 excellent new features in Windows ...