[OpenAFS] Severe Performance Issue with SCSI!

[Mitch Collinsworth]

A bit of a long-shot, but have you checked that your network duplex
settings match between the ethernet switch and the network adapter
in your SCSI machine?  A duplex mismatch will manifest in just the
symptoms you describe.

-Mitch

On Wed, 31 Jul 2002, [iso-8859-1] Rubino Geiß wrote:

> Hi all,
>
> what do you know about SCSI and OpenAFS performance?
>
> Our main server is a SCSI system with 6 disk (10k RPM, 32GB, 160 LDV) on
> 2  Adaptec controllers. This setup is 2-4 times slower than a similar
> system using IDE-drives (5,4kRPM, 40GB).
>
> I have already tested several other SCSI disk and host adapters along
> with different computers and several version of Redhat Linux (7.1, 7.2,
> 7.3). All I get out of these experiments is the fact, that OpenAFS
> crawls if you use SCSI. Even RAID 1 and 2 and 5 (all tested) doesn't
> help.
>
> Some AlphaServer, Tru64 UNIX 5.1 (IBM AFS) seems to perform well even
> with  SCSI; actually this nearly 10 year old machine 10MBit interface is
> even as fast as our fastest IDE-server running OpenAFS.
>
> Our LAN is a switched 100 MBit Ethernet.
>
> The test case is derived from our main application: compiler
> construction. That is touching and reading many small files. Building
> many rather small temporary files and directories.
>
> Your help is very appreciated.
>
> Thank you, Rubino
>
>
> --
> Rubino Geiss, Universitaet Karlsruhe, IPD Goos
> Postfach 6980, D-76128 Karlsruhe, GERMANY
> Adenauerring 20a, 50.41 (AVG), Zi. 235
> rubino@ipd.info.uni-karlsruhe.de
> Tel: (+49) 721 / 608-8352
> Fax: (+49) 721 / 30047
>
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