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тАО08-21-2007 05:30 AM
тАО08-21-2007 05:30 AM
hi - looking at purchasing an EVA4000. Our array use is primarily oracle database and significantly heavier on the physical reads than the physical writes. I've been reading up on the best practices for this array thinking about performance and availability... and given that, here's what I was thinking for configuration:
1) Two disk groups, one for data and apps, one for logs.
2) Use Vraid1 for performance and availability for all LUNS.
3) I'd like to use multiple of 8's in the disk groups, but I'm limited to the amount of disks that I can purchase. I may be able to swing this though and if I can I will.
Any thoughts on the above or other suggestions?
I'm hoping to take advantage of 4gb from host to disk and improve performance. Right now we're on an EVA3000 with 2gb fiber cards and we're using Vraid5 and we really didn't put too much thought into the disk groups....
Solved! Go to Solution.
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тАО08-21-2007 06:41 AM
тАО08-21-2007 06:41 AM
Re: EVA4000 question
http://www.oracle.com/technology/deploy/performance/pdf/EVA_ORACLE_paper.pdf
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тАО08-21-2007 06:56 AM
тАО08-21-2007 06:56 AM
Re: EVA4000 question
thanks,
c
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тАО08-21-2007 07:05 AM
тАО08-21-2007 07:05 AM
Re: EVA4000 question
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тАО08-21-2007 06:48 PM
тАО08-21-2007 06:48 PM
Re: EVA4000 question
http://h18006.www1.hp.com/storage/arraywhitepapers.html
there is one document on best practices for EVA4000/6000/8000
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тАО08-21-2007 07:34 PM
тАО08-21-2007 07:34 PM
Re: EVA4000 question
If your database is significantly more reads than writes, then your logs probably aren't going to being used that much. Therefore you *may* be better going for one disk group rather than two.
That will also make the bean counters happier as you'll get more disk space for your money. With two disk groups, you'll be losing the capacity of at least 4 disks...
I would probably stick with Vraid1 if you can afford it. You don't say how many disk shelves you're looking at getting, however there is greater risk of losing Vraid5 over Vraid1 in the event of multiple simultaneous disk failures.
Hope this helps,
Regards,
Rob
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тАО08-21-2007 08:06 PM
тАО08-21-2007 08:06 PM
SolutionIf you are looking for maximum availability then you would be best going for 8 shelves with multiples of 8 disks in a disk group[s] spread vertically over the disk shelves. This is known as a Robust Availability Config [RAC] and is what HP recommend.
A 4k & 6k are the same controller but it will probably cost a bit more. Shelves are not too expensive but you will also need to purchase 2 backend loop switches for a 6K 2C8D and these will push the price up abit!
However this will also give you a better / less disruptive upgrade path should you wish to add disks in at a later date - remember multiples of 8 installed virtically across all shelves and all the disks [multiples of 8] added to the same disk group to maintain your RAC.
You pays your money...
Mark...
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тАО08-22-2007 01:16 AM
тАО08-22-2007 01:16 AM
Re: EVA4000 question
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тАО08-22-2007 05:56 AM
тАО08-22-2007 05:56 AM
Re: EVA4000 question
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тАО08-22-2007 06:23 PM
тАО08-22-2007 06:23 PM
Re: EVA4000 question
The only argument I've learned is if your SCSI queue is too small and you don't want / can't increase it. By using multiple PVs with LVM striping, you have more parallel IOs.