Re: diagnostic methods
From: Dr. David Kirkby (drkirkby_at_ntlworld.com)
Date: 08/13/03
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Date: Wed, 13 Aug 2003 02:01:40 +0100
Uli Link wrote:
>
> > What tools exist under AIX for testing a system?
>
> As root call "diag".
> For testing the scsi controller and hdisks in the rootvg you need to boot
> from a standalone diagnostics cd.
> Most other devices can be tested when they are not in use by AIX.
>
Thanks, I see that has the ability to test a tape drive too, but I
can't be bothered tonight to do this, as the IBM is in the garage and
I can only use it by a remote login. I got rather fed up running
up/down stairs moving the write protect tab, pushing the tape in/out
etc. I'll do that another day.
> > In particular, I have a tape drive that was giving hardware errors,
> > but after a few cleanings and a change of tape *seems* to be okay. But
> > what is the best way to check a tape drive? I thought of creating a
> > huge file, taking it's checksum, backing up, restoring it and
> > comparing the checksum. But it is hardly very comprehensive, as it
> > might work only when not compressed, or only when compressed, or only
> > at the start of a tape .... etc etc.
>
> I prefer a directory with sourcecode and object files. They are very
> compressible.
> A drive the can write and read compressed can write and read uncompressed
> too.
> It's very unlikely that the decompression is broken, since it is part of the
> DDS2 and higher standards.
> The cpio should bark, when something's wrong during restore.
> If you don't trust the very simple checksums you can compare the files.
> Simply restore the test files to different directory.
>
> On AIX the backup / restore commands are able to software pack / unpack the
> files.
> Don't use software and hw packing both at the same time, will only slowdown
> backup.
Thanks.
-- Dr. David Kirkby, Senior Research Fellow, Department of Medical Physics, University College London, 11-20 Capper St, London, WC1E 6JA. Tel: 020 7679 6408 Fax: 020 7679 6269 Internal telephone: ext 46408 e-mail davek@medphys.ucl.ac.uk
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