Greetings,
    I have seen many posts on adsm.org about LTO, but none that
addresses the problem I am seeing.  Backup speed seems to be fine, at
least as far as I can tell.  But when I do a restore, I see a strange
behavior.  The restore seems to happen in bursts, where the restore
pulls back files lickety-split for a awhile, then stops for 15-20
minutes, then continues.  I think that the wait is the seek from one
spot on the tape to another.  We have two tape drives in the IBM 3583
library, and the problem seems to be happening on both of them.  We
upgraded to the 0CE1 version of the LTO microcode, but it has not
improved things that I can tell.
    We restored 1.5 GB from our RS/6000 TSM server to a NT client, and
it took 47762 seconds, or 13 hours.  All the data was on one tape, so it
is not a colocation problem.  How long should it take an LTO drive to
seek?  I have done these sort of restores on DLT, and it can usually get
from any place to any place on a tape within a few minutes.  I expected
LTO to be at least as good.  A 13 hour restore is completely
unacceptable.
    Any input or things to try would be appreciated.  By the way, the
TSM server is an RS/6000 F50 running AIX 4.3.3 ML4, with TSM 4.1.2.  It
is running atape 6.0.4, and atldd 4.1.5.0, which are both the latest, I
believe.  The NT client was TSM 4.1.2.  Both are on the same switch on a
100MB Ethernet network, so I don't think the network is related in any
way.

TIA,
John Schneider

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* John D. Schneider   Email: jdschn AT attglobal DOT net * Phone: 636-492-0247
* Lowery Systems, Inc.
* 1329 Horan                  Disclaimer: Opinions expressed here are
* Fenton, MO 63026                   mine and mine alone.
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