Re: [ADSM-L] tapes status readonly

2007-04-06 06:52:20
Subject: Re: [ADSM-L] tapes status readonly
From: Richard Sims <rbs AT BU DOT EDU>
Date: Fri, 6 Apr 2007 06:51:55 -0400
On Apr 6, 2007, at 6:22 AM, Chris Lenssens wrote:


Last week some tapes become READONLY.  I tried to move the data to
tape(s) in the same pool and also audit the volume(s).  Both processes
takes such a long time (several hours and the tapes contains less than
10 GB)  that I must cancel the processes.

Must I wait longer or are their other possibilities?
That's usually labored retries in the presence of read errors.  Query
PRocess will show if unreadable files were encountered, and your OS
error log will show device/media problems.  If you encounter the same
struggle on multiple drives, then it suggests the media or whatever
happened when that media was being written.  Based upon the Last
Write Date, see if your Activity Log reflects any issues going on at
the time.  Depending upon your drive technology, you may have dust or
dirt problems on the drive heads: make sure your library has a
cleaning tape available.  (An AIX Error Log will record cleanings.)
Also assure that your drives have recent microcode, as faulty
microcode can make for later problems reading tapes.

If you can't endure the read struggle, go for a RESTORE Volume,
beginning with a Preview=Yes type of invocation to first check for
any problems going into that operation.  A Move Data is usually
preferable, first, to avoid all the mounts usually needed from the
copy storage pool.

  Richard Sims

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