Oracle-L: RE: RAID5+

From: Vergara, Michael (TEM) <mvergara_at_guidant.com>
Date: Tue, 29 Oct 2002 08:58:36 -0800
Message-ID: <F001.004F67EA.20021029085836@fatcity.com>

Russ:

We're using EMC Clariion disk arrays. These are using EMC's version of RAID-5; they call it RAID-S. There is 2GB of cache if front of the disks. They claim that the cache is write guaranteed so that we'll never lose an update. So far, so good, and the performance has been acceptable, except (you knew this was coming, huh?) when we do large file moves from one tray to another, or when doing a refresh of our SAP stage system. This activity kinda buries the internal bus as well as the fiber, so that other users suffer.

I guess to make a short answer even longer, this RAID-S technology seems to work a lot better than RAID-5 used to.

Remember, though, YMMV.

Cheers,
Mike

-----Original Message-----
Sent: Monday, October 28, 2002 5:24 PM
To: Multiple recipients of list ORACLE-L

Hi,
I just got forwarded a whitepaper from Hitachi and Oracle, that compairs raid 5+ and raid 1 using the TPC-C benchmark test suite. The claim is that raid 5 is as fast or faster. While I'm waiting for a comparison or raid 5+ with raid 0+1, I thought I'd take a poll with the list. The benchmark is using the Hitachi 7700E.
Has anyone heard other recommendations attributed to Oracle that are pushing raid 5+ as the configuraton for "unrivaled performance"? Has new disk technology changed the general conception that raid 0 or 0+1 provides better performance than other raid levels?

Thanks,
Russ

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Author: Brooks, Russ
INET: Russ.Brooks_at_dayzim.com

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Author: Vergara, Michael (TEM)
INET: mvergara_at_guidant.com

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