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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