RE: ASM - hardware mirroring vs. Oracle mirroring

Unless you mistrust your hardware multiplexing solution for some good reason you should do it in hardware or the software volume manager at the lower level. The ASM capability is there to guarantee you don't have live without redundant storage even if your hardware fails to provide that capability. A possible exception is if you have two relatively nearby sites (two buildings on a campus or even two datacenter rooms in a large building) with ASM handling the redundancy between two entirely separate storage arrays. (In that case you might consider both.) See BAARF if anyone tells you to use some form of redundancy that is less than a one-for-one multiplexing.  

From: oracle-l-bounce_at_freelists.org [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 8.1.7.4 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

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