I may not have mentioned that I have 2 servers in 2 locations. One runs at our remote lab for live backups, and the other is just sitting in-house (a warm backup) ready to restore in case of disaster.
Neither server had event id's 7, 9, 11, or 15 in the system log. Both servers are not paused.
I have seen media related alerts in the past, but they have never affected anything. The media alerts was a bug that I used to get, but not any more. Perhaps SP2, or sometime around that time, fixed that?
Anyhow, in order for me to get servers back online required that I power down BOTH the computers and the robotic libraries simultaneously (so there would be no power in the SCSI cable). Until I did that, the robotic unit was not even found during the SCSI BIOS post. Since I have powered down both simultaneously, everything has worked flawlessly this week! So what in SP3 caused two robotic units to go catatonic on two completely separate systems?? The robotic units are model PowerVault 132T.