RE: Large ASM installation
- From: "Amaral, Rui" <Rui.Amaral@xxxxxxxxxxxxxxxx>
- To: "'daniel.fink@xxxxxxxxxxxxxx'" <daniel.fink@xxxxxxxxxxxxxx>, 'oracle-l' <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 22 Oct 2010 11:40:50 -0400
Hi Daniel,
I have had several rac datawarehouses on asm (single asm instance) in the multi
terabyte range (20 tb up to 90tb).
Pros - easy to manage from a dba perspective (I did the installation myself -
OS, cluster, ASM, db so for me it was a snap)
- good performance
- easy to use multiple arrays on the same asm instance (my 90tb one was
spread over 2 arrays - an xp10k and XIV for instance - different speeds of the
arrays would need to be taken into account for the physical db design of course)
Cons - need to be aware of the 2 tb limit on individual luns
- extra steps needed to taken on maintaining the luns (ie, take backups of
the asm metadata regularly)
- ideally on larger instances having a dedicated array to the asm is best
(we had the large on go belly up because the san array was on a shared
infrastructure and work being done for other systems had an impact on those
luns - ie, some disk maintenance zeroed out the asm header on our luns even
though that was not the system being worked on - or so oracle support told us).
Would I use it again? Yes, since the performance and ease of use outweighed the
cons for our situation. Besides, knowing the cons it would be easier to add
processes to make sure we would be covered.
HTH
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Daniel W. Fink
Sent: Friday, October 22, 2010 10:10 AM
To: oracle-l
Subject: Large ASM installation
We have a customer that is looking at ASM to handle their databases, the
total planned is about 8TB for a single ASM instance. Has anyone on the
list worked on a large (5+TB) ASM system? What have been the pros and
cons versus a regular LVM and storage? If you had the chance to go back
to the decision time, would you make the same decision and why?
I'm not needing nitty gritty details right now, more of a high level
decision making view.
Regards,
Daniel Fink
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