Those are exactly the problems we also have in our environment.
Do you have solutions for it ?

with kind regards, / met vriendelijke groeten,
Johan Pol
Boerhaavelaan 11 - 2713 HA - Zoetermeer - Tel. (+31)79 3223051 - Fax.
(+31)79 3213989
Internet :JPol AT nl.ibm DOT com / johan.pol AT xerion.be.philips DOT com



Wassim Hossari <whossari AT KFSHHUB.KFSHRC.EDU DOT SA> on 14-04-99 12:00:39

Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

To:   ADSM-L AT VM.MARIST DOT EDU
cc:    (bcc: Johan Pol/Netherlands/Contr/IBM)
Subject:  Re: ADSM and 3570 MP





Hi Ciao:

What we have at our establishment is a 3570 library, Model C12, with 2
drives.  The problems that we are facing are mainly the following:

1- " Tension dropped " during unloading the tape from the tape drive.
2- A lot of write errors occurring during writing to the tapes.
3- Tape mounting delays are occurring on a lot of tapes in the library due
to
a VCR recovery process.
4- The system error log is clocking errors for one of the tape drives and
the
error  message is labeled "Tape error" complaining about media being
defective or dirty read/write head.

Note: regarding the above problem # 4, all the tapes had been replaced with
new once by the IBM CEs and tape cleaning is not the problem ( the same
error
is generated after a manual clean).

regards,
Wassim


Mauro.TINELLI AT st DOT com wrote:

> Wassim,
>
> I have a 3575 library, Model L32, with 3 B-drives. ADSM uses variable
> blocksize. Never had any problem ...
>
> Ciao Mauro
>
> > Hi everyone:
> >
> > We are  using ADSM 3.1.1.0 on IBM R50 machine running AIX 4.2.1 to
> > backup our network servers. Everything was going  smooth and well for a
> > long time until we decided to replace the 8mm tape drive with a Magstar
> > MP 3570 Tape Subsystem.  For the last four months after that
> > replacement, IBM CEs had been trying to fix all kind of errors that are
> > generated on daily bases by the 3570.  The advise that I am seeking
> from
> > any user that have experience with ADSM and the above mentioned tape
> > subsystem is the recommended block size setting for the 3570 tape
> > drives.  Ours now is set to "0" which means variable length block size.
> > Would that be O.K. or should it be set to some other value such as 512
> > or 1024.  I appreciate it if anybody would like to share any experience
> > with regard to dealing with errors generated by the 3570 MP as a tape
> > subsystem to ADSM.
> >
> >
> > regards,
> > Wassim Hossari
> > KFSH & RC