Oracle-L: Veritas and disks

From: Freeman Robert - IL <FREEMANR_at_tusc.com>
Date: Mon, 25 Aug 2003 11:34:28 -0800
Message-ID: <F001.005CD11A.20030825113428@fatcity.com>

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?

--

Please see the official ORACLE-L FAQ: http://www.orafaq.net
--

Author: Freeman Robert - IL
INET: FREEMANR_at_tusc.com

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------

To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Mon Aug 25 2003 - 14:34:28 CDT