This note may describe the behavior you are observing.
www.sun.com/blueprints/0400/ram-vxfs.pdf
HTH
Tony Aponte
-----Original Message-----
From: Freeman Robert - IL [mailto:[EMAIL PROTECTED]]
Sent: Monday, August 25, 2003 3:34 PM
To: Multiple recipients of list ORACLE-L
Subject: Veritas and disks
Anyone have any experience with Veritas CFS (running RAC) and disk IO? We
are seeing some interesting things here with regards to available memory and
disk throughput. We get great throughput when there is sufficient memory.
But, as we load up DD processes, we find available memory decreasing
rapidly, like the copies are being cached to free memory by veritas first.
Then, after the copies appear to be done from the OS, we see consistant disk
activity afterwards.
I suspect that veritas is caching these cp's into memory and then writing to
disk. This works great until I run out of memory, at which time the cp
starts to perform terribly. Is this how Veritas works and is there any way
to configure this behavor?
RF
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Author: Freeman Robert - IL
INET: [EMAIL PROTECTED]
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