Dave Atkin writes:
We are just in the process of replacing our two F230s with three F740s and it's all going well apart from the DLT drives. We bought two Quantum DLT7000 differential SCSI drives, but we can't get them to work.
On startup the 740 hangs for a long time just after the memory test and the "Complete" message. We've tried each drive on two 740s and they both act the same. We used the cable and terminator supplied with drives. The 740s hang even with the drive powered off.
Any ideas anyone? Could it be that these drives are not really differential - how could we tell?
This sounds remarkably similar to the symptoms I saw when I accidentally plugged a single-ended (i.e, non-differential) DLT4000 into our F740. I removed the drive after I noticed it was hanging at a similar point to where yours was, and all was well. I've since had a wide differential DLT7000 on the F740 working without any problems.
As to how to test the tape drives; no idea. `Check with your vendor'?