ADSM-L

Performance degradation on DLT tapes

1999-09-06 08:44:58
Subject: Performance degradation on DLT tapes
From: Alexandre Bicas Caldeira <abicas AT SERVICE.COM DOT BR>
Date: Mon, 6 Sep 1999 09:44:58 -0300
Hi all,

I had about 75GB of data to backup on a DLT tape drive. In order to do
this i will use 3 tapes with 35GB each.

During the backup, while filling the first tape, I had an aggregate data
transfer rate equal to 1.3MB/s. That was ok to me.  When ADSM asked me
to insert an scratch volume on the drive (the second tape), I did it,
but I had a loss of performance: 0.4MB/s. On the third tape my
performance went to 0.3MB/s ! ! ! ! !

This machine is still backing up and I need to use it, but I'm afraid
that the backup performance will degrade even more !

Does anyone know what can be causing this ?!
There is nothing using my network, neither my computer; just ADSM.

Thanks,
________________________________________________
Alexandre Bicas Caldeira - abicas AT service.com DOT br
Service IT Solutions - http://www.service.com.br
   Sao Paulo:    (11) 3040-1960
                 Rua Helena, 280, Cj 1106
                 CEP 04552-050 - Sco Paulo - SP
   Porto Alegre: (51) 212-3666
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