[Veritas-bu] Some drives running slower than others ? Anyone seen this, please?
2005-11-08 18:30:15
Subject: |
[Veritas-bu] Some drives running slower than others ? Anyone seen this, please? |
From: |
j AT joostm DOT nl (Joost Mulders) |
Date: |
Wed, 09 Nov 2005 00:30:15 +0100 |
When drives get to their end of life, the heads are worn out and don't
"see" very well the difference between a 1 and a 0. If this is detected
[by CRC f.e.] the drive winds back and does the read or write again. It
will give up after several tries, thereby reporting a fatal error. It
could be that this re-checking is happening.
On some OS's you can run iostat -E and observe "soft" or "recoverable"
errors. If this is non-zero, that's what's happening.
HTH, Joost
Richard Hellier wrote:
> We have an ATL P3000 library with 5 DLT drives. Just recently, backups that
> happen to land on two particular drives among the five seem to run much more
> slowly than expected. Anyone else seen anything like this, please, and can
> suggest a remedy?
>
>
>
> Thanks!
>
>
>
> Richard.
>
>
>
>
>
>
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