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- Newsgroups: comp.sys.hp
- Path: sparky!uunet!sun-barr!ames!agate!linus!linus.mitre.org!starbase!duff
- From: duff@starbase.mitre.org (David A. Duff)
- Subject: Disk performance question on hp9000/730
- Message-ID: <duff.714850491@starbase>
- Keywords: disk performance hp 9000 730 PA RISC SCSI
- Sender: news@linus.mitre.org (News Service)
- Nntp-Posting-Host: starbase.mitre.org
- Organization: The MITRE Corporation
- Date: Wed, 26 Aug 1992 17:34:51 GMT
- Lines: 44
-
- hello, all.
-
- i'm seeing what seems to be pretty feeble disk performance on my 730.
-
- i have a relatively old 730 (one of the first off the line, as far as i
- can tell). i don't know for sure if that makes any difference.
-
- i have two 97560 drives. i've tested them using the iozone benchmark.
- this benchmark (available from the usual archive places) just reads and
- writes a big file using normal buffered i/o system (but reading and
- writing a large enough file eliminates the effect of buffering).
-
- recently, i aquired two 97560 differential drives and an eisa
- differential scsi board. i'm seeing the same feeble performance with
- these drives as with the others.
-
- i've already spent some time reporting this problem to hp, and i've even
- had a service person come out. originally, i thought it was a problem
- with the 97560's, but we changed roms and it didn't make any difference.
- also, the new differential 97560's exhibit the same poor performance.
-
- before i pursue this further, i'd like to be absolutely sure that what
- i'm experiencing is a problem that is specific to my machine. i'm
- wondering if anyone out there has tried running iozone on a 730 or 750
- (should be comparable performance). what numbers are you getting?
-
- i'm consistently seeing the following:
-
- <800K/second writing
- <600K/second reading
-
- this is for both the differential and single ended 97560's. i have also
- tried striping them together. this roughly doubles the the performance.
-
- the word that i hear from hp is that i should be getting more on the
- order of 2M/second sustained throughput from these drives.
-
- i suspect a problem with the i/o board on my machine. anyone seen or
- heard of similar problems? also, if anyone has performed these or
- similar tests, please post or send me your results.
-
- thanks,
- dave duff mitre corporation 703-883-7731
- duff@mitre.org ai technical center mclean, va usa
-