Re: dirty device

Are you absolutely sure that the delay is related to the tape drive?
Is it even remotely possible that (for example) comms recovery gone mad is
clobbering your box?
I have never forgotten an experience where an old model C25 was brought to
its knees by a failed comms line with over-zealous retrying configured on
it.
Mandy





Kevin H <kevinh@KMTCINC.NET> on 09/05/2001 13:37:42

Please respond to MIDRANGE-L@midrange.com

To:   midRANGE-L@midrange.com
cc:    (bcc: Mandy Shaw/Pacific/UK)
Subject:  Re: dirty device




hi Lenny

dirty devices cause so many retries, retries on retries etc..  The effect,
as you found out, can be enormous.
Are these tapes old ??  There used to be a time when we dumped old media
<eventually> .

Another avenue you might wanna explore is --
-> have you added PTFs lately ??
-> were you previously running a SAVCHGOBJ and that is now changed to
SAVOBJ

Another , less likely avenue, is changes to the hardware config.
It can make a difference, although not as radical as you reported,
placing tape drives and disks strategically, balancing the I/O thruput
of the busses etc... but, like i say, not as radical as you reported..

Personally, I would buy some new media,  clean the device and run with new
media.
That will answer your one question..

good luck
kevin

At 10:58 PM 5/8/2001, you wrote:
>We're having a problem with backup.  It normally takes 3 hours but last
>night it ran for 11 hours before it was cancelled.  There are
>informational messages on the operator's message queue about the tape
>drive needing to be cleaned but these appear every night.
>
>The tape drive is cleaned daily but after so many gigabytes of saved data,
>the dirty device messages seem to be inevitable.
>
>One theory is that the media itself may be dirty which makes the tape
>drive dirty.  This could explain the variation in elapsed time.
>
>Could the device getting dirty slow down the job that much?
>
>_________________________________________________________________
>Get your FREE download of MSN Explorer at http://explorer.msn.com
>
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****************************************************************
Kevin M Howcroft                http://www.kmtcinc.net
AS/400 Technical Consultant     Voice:407.830.5960
kevinh@kmtcinc.net              Fax: 407.650.2638

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      Regards,
      Mandy Shaw

      Notability Solutions PLC
      Kingfisher House
      Frimley Business Park
      Camberley
      Surrey
      GU16 5SG
      UK

      http://www.Notability.com
      Email: Mandy.Shaw@Notability.com

      Telephone: +44 (0)870 166 1000
      DDI: +44 870 166 1324
      Facsimile: +44 870 168 3920
      Mobile: +44 7710 447966





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