Re: ASM IO distribution on a SAN
- From: "K Gopalakrishnan" <kaygopal@xxxxxxxxx>
- To: ryan_gaffuri@xxxxxxxxxxx
- Date: Wed, 12 Sep 2007 21:54:55 -0700
Ryan,
In simple terms (when you are using external redundancy) ASM is like
RAID 0 (plain striping) with 1MB stripes. So all it needs is a JBOD
and it stripes equally in all the available disks (based on the volume
of the data) and at present ASM do not have any control over I/O
volume. It is Stripe and Mirror Everything (SAME).
In a SAN environment, you just get bunch of disks (or something
exposed as DISKS) and use ASM to stripe the data in all available
disks. It could be either mount points, or disk partitions or disk
itself. Of course the assumption is all the available disks are having
same I/O characteristics.
-Gopal
--
Best Regards,
K Gopalakrishnan
Co-Author: Oracle Wait Interface, Oracle Press 2004
http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/
Author: Oracle Database 10g RAC Handbook, Oracle Press 2006
http://www.amazon.com/gp/product/007146509X/
--
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