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SubjectRe: Problems even with 512 block size MOs
> Copying a 6.5 MByte file with cp returns nearly immediately on the
> commandline, but umount nearly takes forever. Maximum rate detected by
> xosview during umount was about 30 kByte.
> I have similar behaviour on another machine and with different disk. However
> I don't get any "dmesg" output despite the "CONFIG_SCSI_LOGGING=y" option on
> both machines.

That sounds like it isnt queueing multiple commands at a time. M/O has
an erase/write sequence so you want to queue large blocks otherwise its two
rotations per I/O

> Are all my MO disks rotten? Are the MO drives broken? Are my SCSI adapters
> broken? Or is there a bug in the SCSI layer?

SCSI layer or scsi driver I suspect.

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