RE: Does ASM's EXTERNAL REDUNDANCY concatenate?

 
Hi Martin,
   Oracle will stripe (1MB) across your RAID (creating a plaid) which is
okay as long as the stripes of your raid are a multiple of 1MB (e.g.
256KB stripes).  You could create you backend RAID and present with 6
(x2GB) LUNs carved from your RAID config as your diskgroups.  

Just some thoughts.

Good luck,
   Oliver


-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Martin Klier
Sent: Monday, June 30, 2008 2:54 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: Does ASM's EXTERNAL REDUNDANCY concatenate?

Hi list,

does ASM's EXTERNAL REDUNDANCY feature stripe the data or does it
concatenate them?

Background:
Oracle EE x86_64 on Linux, Version 10.2.0.4

Setup:
2x Adaptec 5085, each connected to an own SAS JBOD with 16x 1TB HDD, one
of them is global hot spare disk

I want a diskgroup with 12TB in size, 6TB on each JBOD.

Another sad thing: Due to Metalink note 6453944.8, I can't create ASM
diskgroups with disk members larger than 2TB due to corruption risks and
ORA-15099 (which is really nasty!).

Any ideas to the question or to my sceanrio in general are greatly
appreciated!

Thanks in advance
Martin Klier

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