Nicholas,
I agree with Steve's comment, except when we get a tape error,
we do an 'audit volume xxxx fix=yes' first, and if it doesn't get an
error, we put it back into service. If it gets any errors, we 'move
data' to clear off as much data as possible, then destroy the tape. I
would NOT simply live with a tape that get occasional errors. A tape
might cost $80-90, the data could be worth many thousands or millions in
the case of a disaster.
Start keeping track of which tape drives are getting the errors.
It could be the drive, not the tape. Also make sure your cleaning tapes
aren't old. With LTO the cleaners are good for 50 cleanings. Replace
them at that point, don't reuse them. You will cause errors and reduce
the life of your drives.
Use the IBM3584 automatic tape drive cleaning, not TSM's
cleaning. I found out the hard way that TSM's tape cleaning is very
unreliable, and frequently misses cleaning requests. We changed to the
IBM3584 automatic cleaning, and our errors went way down.
Don't hesitate to bring in your CE support if you seem to be
getting a lot of errors; ask them to run diagnostics on your drives, and
look for a failed one. Check your level of microcode and Atape drives,
and make sure you are up-to-date. These steps may take time and
Hope this helps.
Best Regards,
John D. Schneider
Phone: 314-364-3150
Cell: 314-486-2359
Email: John.Schneider AT Mercy DOT net
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Nicholas Rodolfich
Sent: Wednesday, June 11, 2008 10:34 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Fwd: Re: [ADSM-L] Bad volume rule of thumb
Sorry folks I forgot the technology we are using. We have an IBM 3584
library with LTO1 drives.
>>> steve AT STEVENHARRIS DOT INFO 6/11/2008 9:09 AM >>>
Hi Nicholas
You don't say what your tape technology is. I used to admin a site that
had LTO1 and LTO3 drives. With the LTO1s I would run move data on any
tape in error, and if that worked record the volser of the tape.
After
three errors, or if the move data didn't work I would discard the tape.
For the LTO3s I discovered that any error tended to be permanent.
I currently work a lot with LTO2s and they fail similarly to LTO1s, but
more of them fail hard on the first error.
Regards
Steve.
Steven Harris
TSM Admin, Sydney Australia
Nicholas Rodolfich wrote:
> Hello All,
>
> Thanks for your help!!
>
> The volume inventory here is rather old here(2002). There tends to
be
> many read and write errors in the volume inventory. I was looking for
a
> rule of thumb regarding how many errors trigger disposal of these
> volumes.
>
> I have been disposing of them at the first sign of either read or
write
> failures but I am seeing so many, I am beginning to wonder if some
level
> or read/write errors is acceptable. Any thoughts on this will be
> appreciated.
>
> Nicholas
>
>
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