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Beg to differ Gents. We had an install with UDP/Solaris/1GB over private circuits Sun to Filer - so no switch or hubs in the way at all.

Performance was worse than the kit it replaced. Specifically backing up (I know - over NFS not a good idea - but that's another tale <g>) it took 36 hours for 225GB to go to tape.

Switch to TCP and with TCP tuning (that I published to the list a while back) and performance screamed - file I/O via a Sybase control database went from 30-60 seconds down to 3 or 4. And the backups dropped to 4-5 hours.

NetApp definitely stated UDP/Solaris/1GB was not a good combination and stick with TCP. It's a Solaris implementation they implied. I posted their notes here as well

TTFN

Peter

-----Original Message-----
From: John Clear [mailto:jclear@ati.com]
Sent: 20 August 2002 19:02
To: 'igor@txc.com'; Jeff Kennedy
Cc: Brian Long; Robin Winslett; toasters@mathworks.com
Subject: RE: Oracle using NetApp

-----Original Message-----
As far as I'm concerned, this is an urban legend :-) I use UDP v3 on
Solaris with NetApp, and I've always had a good performance, no worse
than Linux or HPUX. When you say you experienced it yourself, what
exactly did you see? Was it reproducible with iozone? What were the
numbers?
-----Original Message-----

In our environment, YMMV, Solaris (100mb) to NetApp (100mb) works fine over
UDP. Solaris (100mb) to NetApp (gigabit) was horribly slow for certain operations.
Normal file reads were fine, but a compare (`cmp`) of two files from the same filer
were unbelievably slow. A cmp that would take 15 seconds to the 100mb interface of
the NetApp would take an hour or more to the gigabit interface. To get Sun to actually
admit it was their problem, we did a Solaris (100mb) to Solaris (gigabit) test over UDP,
and it took 5minutes or so. Not as bad as to NetApp, but bad enough for them to file a
bug, which Sun Engineering ignored since there is a work-around (use TCP or the 100mb
interface of the filer). This was with Solaris 8. Solaris 7 did not have this problem
in our environment.

Since nearly all our clients are 100mb, and only our QA group was running into this,
we set their automount entries to point to the 100mb interface.

John





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