RE: Write cache for a SAN

From: Freeman, Donald <>
Date: Mon, 3 Nov 2008 09:19:58 -0500
Message-ID: <55264C4C0484A547B34C0B1A28E219EA1952D15C8B@ENHBGMBX01.PA.LCL>

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<>

From: [] 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

Received on Mon Nov 03 2008 - 08:19:58 CST

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