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тАО04-19-2005 11:14 PM
тАО04-19-2005 11:14 PM
I have 15 *10 GB LUNs (ESS Storage hardware level RAID-5) and need to create 6 filesystems for an oracle 817 database. Which of the following is the best & why.
01. Stripe all the filesystems on to 15 luns.
02. Stripe 2 filesystems each on to 5 luns and have 3 sets of 5 luns this way.
There are two small redologs volumes as well .. I could'nt think of a best method than striping it on all available lun's.
Let me know your views....
Regds,
Kaps
Solved! Go to Solution.
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тАО04-20-2005 02:02 AM
тАО04-20-2005 02:02 AM
SolutionNeither of your scenarios meets that standard.
If you can not afford to meet Oracle guidelines choose the scenario (01) that puts the data on the maximum number of physical disks possible.
To be certain, you will need to find out how the LUNS have been built on the disk array.
SEP
Owner of ISN Corporation
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тАО04-20-2005 02:16 AM
тАО04-20-2005 02:16 AM
Re: Best Practice LVM Striping
With second option, management will be easy and the same time you are stripping over 5 disks.
Anil
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тАО04-20-2005 02:27 AM
тАО04-20-2005 02:27 AM
Re: Best Practice LVM Striping
My rule of thumb is to stripe the already RAIDed LUNS (RAID5,10,S,etc) N-ways no matter what array I am using. The value of N (or columns) are in multiples of 2 - no less than 4 and no more than 8.
The most host-based important striping parameter is your stripe width or size -- which is dependent on the type of DB you are running. 64Kb seem to be neutral for both OLTP and DSS use although I have built 8-way stripes with up to 1024KB as stripe size and adjusted my Filesystem and VOlume Management tunables to match this structure as well as my DB's needs.
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тАО04-20-2005 02:40 AM
тАО04-20-2005 02:40 AM
Re: Best Practice LVM Striping
Where do your 15 LUNS come from: from 3 (more or less?) distinct array groups? I tend to stripe across different LUNS from different array group where possible then choosing the primary access in alternance between the different controllers...
All the best
Victor
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тАО04-20-2005 06:21 AM
тАО04-20-2005 06:21 AM
Re: Best Practice LVM Striping
Kaps
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тАО04-20-2005 06:25 AM
тАО04-20-2005 06:25 AM
Re: Best Practice LVM Striping
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тАО04-20-2005 06:30 AM
тАО04-20-2005 06:30 AM
Re: Best Practice LVM Striping
I would also go with option2 as there is no point in stripping it across more than 4-5 LUNS where actually your LUN is allready stripped in RAID5 at hardware level.
Here we have got HP's XP1024 and were also running Oracle817 database prior to upgradation last week. We have stripped our Veritas volumes across approx six LUNs and had no problem. (Hardware Level Raid5 with 3D+1P) Same applies to LVM's Logival volumes as well.
HTH,
Devender
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тАО04-20-2005 06:34 AM
тАО04-20-2005 06:34 AM
Re: Best Practice LVM Striping
Just one more thing, please avoid striping N-ways with N being an odd number. Always have your storag columns in multiples of 2.
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тАО04-21-2005 02:23 AM
тАО04-21-2005 02:23 AM
Re: Best Practice LVM Striping
http://www.oracle.com/technology/tech/hp/storage.pdf
They claim that there's minimal performance advantage gained by separating redo/indexes/data.
As always, YMMV, so you'll probably want to test what's best for you.