I've a somewhat irritating problem with a Dell 2970 that has a HP 1/8 G2 autoloader (the Ultrium LTO 2 model) attached to the Dell/LSI 2032 non-RAID SCSI card.

In essence, sometimes the autoloader/drive completely fails to appear on the SCSI chain (i.e.: there's neither a media changer or tape drive present within the device manager) and sometimes it appears but then subsequently disappears at a seemingly random (yet always inconvenient) time, resulting in backup failures.

On most occasions, there are simply no errors logged in the system event log, but I did manage to capture a series of LSI_SCSI event ID 11 ("The driver detected a controller error on \Device\RaidPort0") errors followed by an event ID 129, ("Reset to device, \Device\RaidPort0, was issued") error during testing.

I've tried two different cables, both with the same effect – sometimes the autoloader appears (for a while), sometimes it's completely absent. There's only one terminator I've tried to use, but as I've since successfully tested the autoloader on multiple occasions (albeit via a Adaptec U160 card on a different machine), my gut feel is that the issue doesn't lie with the terminator, or indeed the autoloader itself.

As such, I'm just wondering if anyone has any ideas?

It's most likely not relevant, but this is all under Windows SBS 2008, running Backup Exec 12.5 SBS edition (the Dell version), both fully patched. Addidtionally, the autoloader is running the latest firmware.

It's been a while since I've dealt with anything SCSI, so all suggestions will be gratefully, gratefully received.