Re: Does ASM's EXTERNAL REDUNDANCY concatenate?

Hello Martin,

With ASM the goal of filling up devices in a diskgroup is to ensure that *all
*devices within the diskgroup are filled up to the same capacity. So even
with external redundancy, if you have multiple devices within the diskgroup,
ASM will stripe your data across the devices.

You can easily get around the issue that you mention by adding multiple
devices to the diskgroup that are below the 2TB threshold. I don't see this
as being too much of a problem?

cheers,

jason.

--
http://jarneil.wordpress.com


On Mon, Jun 30, 2008 at 10:54 AM, Martin Klier <usn@xxxxxxxxx> wrote:

> 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
>
> --
> Usn's IT Blog for Linux, Oracle, Asterisk
> http://www.usn-it.de
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

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