ADSM-L

Re: 2 3494 Tape libraries seem to have very different capacities. Any ideas?

2004-08-23 15:56:54
Subject: Re: 2 3494 Tape libraries seem to have very different capacities. Any ideas?
From: David E Ehresman <deehre01 AT LOUISVILLE DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Mon, 23 Aug 2004 15:56:53 -0400
tsm: ULTSM>select stgpool_name,status,count(*) from volumes group by
stgpool_nam
e,status

will tell you if you have a difference in pending tapes.



>>> jdury AT DUQLIGHT DOT COM 8/23/2004 3:02:26 PM >>>
Here is the output from that command. Looks pretty close on both.
DEVCLASS_NAME          GB/Tape
------------------     -------
3494CLASS1               40.35
3494CLASS2               40.58

Sigh,
John

 So you have about 2 gig of data that hasn't migrated over.  Seems
 reasonable.

 The following query will tell you if you're getting the same amount
of
 data on full tapes:

 tsm: ULTSM>select devclass_name,cast(avg(est_capacity_mb)/1024 as
 decimal(5,2))
 as "GB/Tape" from volumes where status='FULL' group by devclass_name

 David

 >>> jdury AT DUQLIGHT DOT COM 8/23/2004 2:28:34 PM >>>
 Here is the output from that command. It looks pretty similar to me.
I
 also
 checked compression for both local and remote libraries. All are on.
 We
 also run a job every night that deletes the dbb volhistory which
 allows
 only 2 days of retention. (del volhist type=dbb todate=today-2)

  STGPOOL_NAME: 3494LOCAL
   Unnamed[2]: 38531539
   Unnamed[3]: 11776076.83
   Unnamed[4]: 11886072.01

 STGPOOL_NAME: 3494REMOTE
   Unnamed[2]: 38513745
   Unnamed[3]: 11773755.03
   Unnamed[4]: 11876887.56

 These are all great suggestions which is why I asked here but I'm
still
 at
 a complete loss.
 John

  The output from "select
  stgpool_name,sum(num_files),sum(logical_mb),sum(physical_mb) from
  occupancy group by stgpool_name" should give some indication of
 whether
  the same amount of stuff is getting to the remote storagepools.

  David

  >>> jdury AT DUQLIGHT DOT COM 8/23/2004 1:26:57 PM >>>
        We have 2 3494 tape libraries. One is local and the other is
  remote.
  The local one (3494LOCAL) receives all the data from the nightly
  backups as
  it gets migrated from disk. The remote one (3494REMOTE) is only used
 as
  the
  target of backing up the 3494LOCAL storage pool which gets done
  everyday
  during the day. 3494LOCAL has 577 library volumes in it. 3494REMOTE
 has
  494
  library volumes in it. Both tape libraries only have 3590K tapes in
  them.
        My problem is that 3494LOCAL has 62 scratch tapes available
and
  3494REMOTE has 207 scratch tapes in it. Reclamation runs daily and
 sets
  the
  same percentage (57) for both libraries. How can there be such a
huge
  difference in the number of scratch tapes if both libraries should
  roughly
  have the same amount of data? It's making me a little nervous that
  3494REMOTE doesn't have the same data or something somewhere is
going
  wrong.
  Any ideas?
  Thanks,
  John

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