X-no-Archive:yes
The times you mention are exceedingly slow.  The  DLT4000 is good for
either 1.5 MB/s uncompressed or 3 MB/s compressed.  At those rates, backing
up 371 MB should take you less than 5 minutes, uncompressed or 2.5 minutes
compressed.  Something is amiss here.

19 Megasectors translate to 4.864 GB.  A DLT4000, in uncompressed mode,
should be able to back that up in less than an hour.  In compressed mode,
it should be closer to one half-hour.  There could be several reasons for
such bad performance.  What kind of tapes are you using?  What kind of disk
drives holds the data? What connection do you have from the system to the
DLT?  Are there other devices on that SCSI bus?

Kind regards,

Denys. . .

Denys Beauchemin
HICOMP America, Inc.
(800) 323-8863  (281) 288-7438         Fax: (281) 355-6879
denys at hicomp.com                             www.hicomp.com


-----Original Message-----
From:   [log in to unmask] [SMTP:[log in to unmask]]
Sent:   Wednesday, 09 September, 1998 3:50 PM
To:     [log in to unmask]
Subject:        NON HP DLT

A few weeks back I posed a question about placing a non-HP DLT on an
HP3000/959-400.  This past weekend I configured it in as a HPC1521B and
hooked
it up.   This is a DLT4000 (unknown what manufacturer).   The only problem
I
ran
across was when I attempted to use DEVCTRL to disable hardware compression.
On
our DDS2 tape which had hardware compression we disabled hardware
compression
because we were using software compression (Orbit Backup3000+).  With the
DLT
disabling hardware compression does not seem to be necessary.

Here are some of the performance stats that I have come up with:

A full backup of 19M sectors took 7 hours and 4 tapes with a DDS2 drive.  A
full
backup with the DLT took 3 hours and 1 tape.

A backup on 371MB took 8min and 52sec with software compression.
A backup on 371MB took 11min and 21sec without software compression.

If anyone has any questions please feel free to ask!


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Barry Durand
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