RE: ASM Host Mirroring

From: Randy Johnson <>
Date: Thu, 27 Mar 2008 06:36:39 -0500
Message-ID: <009401c88ffe$da2d5bd0$8119fea9@scraunch>

The actual Oracle terminology is:  

    Normal or High Redundancy - Mirroring Provided by ASM     External Redundancy - Redundancy external to ASM (disk/san/host level)  

If you are asking about failgroups then you are talking about Normal/High Redundancy.

From: [] On Behalf Of Powell, Mark D
Sent: Tuesday, February 19, 2008 3:17 PM To: oracle-l
Subject: RE: ASM Host Mirroring

I believe that when "host" based mirroring is in use in relation to ASM that it means the host OS or hardware is performing the mirror function outside of ASM so ASM is not mirroring the disk in this case.  

  • Mark D Powell -- Phone (313) 592-5148

From: [] On Behalf Of LS Cheng
Sent: Tuesday, February 19, 2008 2:33 PM To: oracle-l
Subject: ASM Host Mirroring


Does anyone know how ASM does host based mirroring. For example we have two storage arrays with 10 metres distance, two failure groups are created, one per array. How does ASM mirror the extents? Network? Using the Cluster Interconnect? Or a seperate Network?  



-- Received on Thu Mar 27 2008 - 06:36:39 CDT

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