John,
This problem is very interesting to me as we are thinking of throwing away our
17 ATL libraries running Legato's NetWorker 6.0.1 in favor of 2 LTO 3584's
running
Tivoli Storage Manager (we will actually use a Sun E420). I thought colocation
was suppose to speed up recoveries, it sounds as if it's not working as
advertized....
-Bern
At 02:47 PM 5/4/2001 +0200, Karsten Hüttmann wrote:
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>Hi!
>Your problem sounds familiar to me.
>We've similar problems running HSM (or now: Tivoli Space Manager) with
>a LTO 3583. (Ok, it is not the best way to use a LTO Library with
>HSM, but that was not my decision). For a recall of 2 GBs we need half a
>day.
>But: a normal restore of a client is as fast as we expected.
>
>John Schneider wrote:
>
> > 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
> >
> > ***********************************************************************
> > * John D. Schneider Email: [EMAIL PROTECTED] * Phone: 636-492-0247
> > * Lowery Systems, Inc.
> > * 1329 Horan Disclaimer: Opinions expressed here are
> > * Fenton, MO 63026 mine and mine alone.
> > ***********************************************************************
>
>--
>Mit freundlichen Grüssen / with regards
>Karsten Hüttmann
>
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