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тАО01-26-2006 03:41 PM
тАО01-26-2006 03:41 PM
Performance Difference between logical volumes
I am about to install SAP ECC5 in our server. I'm just wondering if there is an effect in performance if I create 1 big /oracle logical volume rather than creating separate logical volumes for sapdata1, sapdata2, etc.
What are the pros and cons of having 1 logical volume for the whole /oracle directory?
Thanks,
Karl
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тАО01-26-2006 03:50 PM
тАО01-26-2006 03:50 PM
Re: Performance Difference between logical volumes
So the advantages far outwiegh the disadvantages. You shuold have multiple lvols rather than having just one big lvol.
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тАО01-26-2006 06:39 PM
тАО01-26-2006 06:39 PM
Re: Performance Difference between logical volumes
However , since most of us have SAN on huge
diskstorage cabinets who have the capability
to buffer gigabytes of read and write ,
the whole principle becomes questionable,
as it does not matter.
So if your db is on local disks or on an
attached diskcluster via scsi , definitely
spread lvols.
If you are attached to a SAN it doesn't matter anymore for performance.
Still I would choose for
the old convention as it is more clear
and manageable.
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тАО01-26-2006 07:16 PM
тАО01-26-2006 07:16 PM
Re: Performance Difference between logical volumes
vgcreate -g PVGstriped -n name disk1 disk2 ..
lvcreate -D y -g PVGstriped etc
Forgive me if my command syntax isn't perfect: been on Solaris for 2 years now, working from memory....:->
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тАО01-26-2006 07:22 PM
тАО01-26-2006 07:22 PM
Re: Performance Difference between logical volumes
Makes it easier to check performance of certain areas (by lvol).
Rgds...Geoff
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тАО01-26-2006 08:17 PM
тАО01-26-2006 08:17 PM
Re: Performance Difference between logical volumes
if you are using one of the state-of-the-art SAN, it really does not matter. You would then create lvols as per your convenience and perceive ease..
of course, they are principles that you can adopt as per where to locate your datafiles. (eg. archived regolog, redologs, etc)
hope this helps too!
kind regards
yogeeraj
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тАО01-26-2006 09:25 PM
тАО01-26-2006 09:25 PM
Re: Performance Difference between logical volumes
At least one lvol for datafiles and redologs/archivelogs and another for binary files and redologs/archivelogs. Redologs/archivelogs should be multiplexed.
Also very important is to have at least 2 tablespaces for each application module: ARD and ARX for Receivables, APD and APX for Payables, etc...
Best Regards,
Eric Antunes