From: Jim Turner (JTurner@hertz.com)
Date: Thu Jun 29 2006 - 11:33:00 EDT
Many thanks to Andy Cranston, James Lonski, Corinne Haesaerts, and James
Perry for their replies.
I can't explain it, and I'm not happy about it, but ... I threw a GigE
switch between the two RAC cluster nodes, and the DBAs said that the
inter-node latency went away. They said Oracle's cache fusion is working
much, much better now. The switch apparently provides some sort of
low-level mojo that tells both NICs that the link is there and ready at all
times. Speculation is that with the crossover cable, the NICs had to
establish a new link each time an attempt was made to use it. It's not
that the RAC cluster didn't work with the crossover cable -- it did. It's
just that it works much faster now with the interconnect going through a
switch.
===========================================
Jim Turner (jturner@hertz.com)
Supervisor, UNIX Systems Programming
The Hertz Corporation Worldwide Data Center
5601 Northwest Expressway, Area 1035-25
Oklahoma City, OK 73132-5297
Office: 405-280-6587
Cell: 405-204-6050
Fax: 405-290-2547
Sprint Text: 4052046050@messaging.sprintpcs.com
Nextel Text: 4053381354@messaging.nextel.com
----- Forwarded by Jim Turner/MIS/OKC/Hertz on 06/29/2006 10:19 AM -----
To
hpux-admin@DutchWorks.nl
cc
Jim Turner
<JTurner@hertz.com> Subject
Sent by: [HPADM] Oracle 9i / 10g cluster
hpux-admin-owner@DutchWorks. interconnect
nl
06/06/2006 02:49 PM
Although this is not purely an HP-UX question, I hope you'll forgive me for
tapping the brain trust which I've found to live here.
On a two-node RAC cluster, why does Oracle say that a simple crossover
cable is not supported for the cluster interconnect? Oracle insists that
the interconnect must go through a switch because the switch provldes some
sort of heartbeat mojo that the Oracle driver needs. (SQE Test?)
I just want to understand why I'm gonna have to burn two switch ports
instead of using a crossover cable.
Thanks!
(Cross-posted to the ITRC Forums.)
===========================================
Jim Turner (jturner@hertz.com)
Supervisor, UNIX Systems Programming
The Hertz Corporation Worldwide Data Center
5601 Northwest Expressway, Area 1035-25
Oklahoma City, OK 73132-5297
Office: 405-280-6587
Cell: 405-204-6050
Fax: 405-290-2547
Sprint Text: 4052046050@messaging.sprintpcs.com
Nextel Text: 4053381354@messaging.nextel.com
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