RE: ASM - hardware mirroring vs. Oracle mirroring
Date: Fri, 11 Apr 2008 15:47:56 -0400
But isn't mirroring and striping most of what ASM does? Wasn't it intended to eliminate the need to purchase an expensive SAN?
I understand that many people use ASM in conjunction with Symmetrix, etc., but I don't see how just pooling the storage and presenting it to the database is worth the effort (and the limitations, as there are certain operations in, e.g., RMAN, that aren't supported with ASM).
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[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Bobak, Mark
Sent: Friday, April 11, 2008 9:59 AM
To: peter.schauss_at_ngc.com; oracle-l_at_freelists.org Subject: RE: ASM - hardware mirroring vs. Oracle mirroring
Where in the documentation do you see Oracle having a bias towards ASM doing mirroring?
I ask cause several Oracle folks I talked to, and an Oracle "best practices" presentation I saw a while ago, all say the same thing. That being, if you already have a well-designed SAN, use external redundancy in ASM, and let the SAN do all the mirroring and striping.
That's where we're at, as well. SAN does all mirroring and striping. ASM just pools the storage and makes it available to the database.
-- Mark J. Bobak Senior Database Administrator, System & Product Technologies ProQuest 789 E. Eisenhower, Parkway, P.O. Box 1346 Ann Arbor MI 48106-1346 +1.734.997.4059 or +1.800.521.0600 x 4059 mark.bobak_at_proquest.com <mailto:mark.bobak_at_il.proquest.com> www.proquest.com <http://www.proquest.com> www.csa.com <http://www.csa.com> ProQuest...Start here. From: oracle-l-bounce_at_freelists.orgReceived on Fri Apr 11 2008 - 14:47:56 CDT
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Schauss, Peter
Sent: Friday, April 11, 2008 9:34 AM To: oracle-l_at_freelists.org Subject: ASM - hardware mirroring vs. Oracle mirroring I am starting to investigate ASM as a part of a potential 184.108.40.206 to 10g upgrade on Solaris (SunOs 5.9). Oracle's documentation seems to have a bias toward having the ASM instance handle the mirroring while our UNIX support people would prefer to do it at the hardware level. Which is preferable and what factors would push a decision in one direction or the other? Thanks, Peter Schauss ============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ============================================================================== -- http://www.freelists.org/webpage/oracle-l