RE: Write cache for a SAN
- From: "Freeman, Donald" <dofreeman@xxxxxxxxxxx>
- To: "'JBECKSTROM@xxxxxxxxx'" <JBECKSTROM@xxxxxxxxx>, oracle-l-freelists <oracle-l@xxxxxxxxxxxxx>, oracle-db-l <oracle-db-l@xxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 3 Nov 2008 09:19:58 -0500
We don't disable it. The SAN manufacturers have made this as bullet proof as
possible. Ours has redundant power supplies to make sure that cache is
written. Nothing is completely fool proof but they have made it as much so as
possible. We just had a back plane failure on a relatively new SAN that
necessitated us moving everything off it while it ran on a single channel.
That was inconvenient but the redundancy paid off. We didn't lose anything.
Donald Freeman
Database Administrator II
Commonwealth of Pennsylvania
Department of Health
Bureau of Information Technology
2150 Herr Street
Harrisburg, PA 17103
dofreeman@xxxxxxxxxxx<mailto:dofreeman@xxxxxxxxxxx>
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Jeffrey Beckstrom
Sent: Monday, November 03, 2008 7:24 AM
To: oracle-l-freelists; oracle-db-l
Subject: Write cache for a SAN
For those of you using a SAN, do you disable the write cache? I am concerned
that if the UPS loses power thus bringing the SAN down,that writes to the
datafiles would be lost. Oracle would think they are completed but never
actually done.
Jeffrey Beckstrom
Database Administrator
Greater Cleveland Regional Transit Authority
1240 W. 6th Street
Cleveland, Ohio 44113
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