> Norbert Writes:
> : Subject: DLT 4000 Performance
> :we have installed a Quantum DLT 4000 FW/Differential tape drive
> :(delivered by HP) at a HSC-Bus on a K400 with HP-UX 10.10. We expected to
> :have a data transmission rate of about 3 MB/s, assuming a compresssion
> :rate of 1:2. Instead we have measured a rate of only 1.28 MB/s at a
> :compression rate of 1:3 (1 GB saved in 13 minutes). This is indeed less
> :than the rate we would expect without compression! We think our hard
> : disks should be fast enough.
> :Has anybody got experience with this configuration?
> :Which tape driver is suited best?
> :What is the correct position of the parity switch at the DLT 4000?
> We are running on a D350 doing backups with a product called OpenVision
> which in our experience is pretty quick. We are getting about what you are
> for backing up D to D which is pretty realistic in the real world. If you
> are able to save 4.5 gig of uncompressed date in a hour then you are doing
> quite well in my opinion. Compression of 1:3 is better than we see.
> Bob Kirkman
> Open Systems Services
I hate to jump in here, as this is a little bit off the subject, but we
were told by HP that only their single-ended SCSI controller would
support a DLT tape drive - now I'm reading that someone's got a DLT
attached to a F/W differential controller.
Anyone got any ideas as to what works, and why?
"ALPO costs 99 cents a can. That's over SEVEN dog dollars!!"