From: Oliver Jost <>
Date: Mon, 30 Jun 2008 15:09:25 -0400
Message-ID: <DB508580748FAD4692628A58C4E653F50431E114@MAIL01.Corp.FC.LOCAL>


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,


-----Original Message-----

[] On Behalf Of Martin Klier Sent: Monday, June 30, 2008 2:54 AM
Subject: Does ASM's EXTERNAL REDUNDANCY concatenate?

Hi list,

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

Oracle EE x86_64 on Linux, Version

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


Usn's IT Blog for Linux, Oracle, Asterisk


-- Received on Mon Jun 30 2008 - 14:09:25 CDT

Original text of this message