> Sounds a lot like what I was seeing when we got our "new to us" 3590E1A > drives. > > The problem was the microcode level. It was way behind and caused all > kinds of grief. 2/3 of our new tapes were unlabelable. The drive would > load the tape and spin for ever until it timed out. > > Once the microcode/firmware was upgraded, problems went away. Went back > and relabeled tapes that previously were unlabelable.
We have, as far as I can tell, solved our problem. We had to increase the missing interrupt time for the 3590 drives. If an I/O operation is pending for longer than the missing interrupt time, OS/390 will decide that the operation failed.
