Re: [Networker] SuperDLT 320 drive: what writing speed are you se eing?

Hi Zaigui

I'm sorry if this has been discussed before, but I'm going to assume that
there is some thing in your environment, other than the tape drive, that is
limiting your backup speed.  Unfortunately, most backups environments have
MANY places that could limit performance (CPU, I/O bus, disk, tape,
filesystem, network, etc.).  Isolating which one is the current limiting
factor can be a challenge

The "Legato NetWorker® Power Edition(tm) Performance Tuning Guide"
(http://web1.legato.com/infodev/publications/NetWorker/perftun/5.5.1/cd_docs
/perftune.pdf) has good suggestions on performance in general, and how to
test certain components in particular.  See "How to Test the Write Speed of
a Single Tape Drive" in the UNIX chapter, if you have a UNIX host connected
to your new tape drives.  Or, see the Windows chapter for similar
suggestions.

Please let us know what happens.

Thanks!
tl

-----Original Message-----
From: Zaigui Wang [mailto:zaigui AT yahoo DOT com]
Sent: Tuesday, December 10, 2002 2:17 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] SuperDLT 320 drive: what writing speed are you
seeing?


Folks,

I asked this question before but did not get any
response. I am hoping over time more and more people
are getting this  tyep of drive and are able to play
with it to get the optimal performance.

We recently set the new library up (ATL P4000) and no
matter how we tried, we are only seeing about
11-15MB/s (from networker GUI). Considering the
theoretical speed of 16/32 MB/s (native/compressed),
this is hardly satisfying.

I understand that lots of factors can contribute to
the sustained speed on a drive. But I just cannot
ignore the fact that we are seeing 7-8MB/s on our
DLT7000 tape drives (compressed). SuperDLT 320
supposedly is 3x faster.

Any input?

Thanks.

Zaigui



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