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тАО10-06-2003 04:57 AM
тАО10-06-2003 04:57 AM
Do you use Autoraid or RAID 1+0?
How do you decide what RAID level to use with regards to VA7410?
Raid 5
Raid 1+0
or
Autoraid?
Thanks
Solved! Go to Solution.
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тАО10-06-2003 06:12 AM
тАО10-06-2003 06:12 AM
Re: VA7410 How do you RAID yours?
You also need to look at your data type. Large sequential files will read and write faster on RAID 5. Most everything else is better on RAID 1+0.
Space requirements often dictate your raid type. 1+0 yields 50% usable space, while RAID 5DP offers more usable space.
AutoRAID bounces data back and forth between RAID 5DP and RAID 1+0. The more active data is kept on 1+0, and the less active data is migrated to RAID 5DP. It also detects large sequential files, and keeps them on RAID 5DP for performance sake. So you could say that AutoRAID gives you the best of both RAID types.
To answer you question; there is no right general answer - but I hope this info helps.
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тАО10-06-2003 06:35 AM
тАО10-06-2003 06:35 AM
Re: VA7410 How do you RAID yours?
Some general things about the RAID levels on the VA7000 series:
Obviously, RAID 1+0 is going to be the best performance, but you will only be able to use a little less than half of the raw disk capacity.
With AutoRaid, the array will move older unchanged data to the RAID 5 level as the allocated disk space takes up more than half the array.
One advantage of the RAID 5DP level that the VA uses is that the array will be able to survive the simultaneous failure of 2 drives. This was a concern with older RAID 5 implementations. See this page for more info, it has a lot of good whitepapers on RAID performance as applicable to the VA series.
http://www.hp.com/products1/storage/products/disk_arrays/midrange/va7410/infolibrary/index.html
As for as my recommendation: If you are going to be doing a lot of small random writes, then I recommend RAID 1+0, If you do a lot of large sequential writes however, then RAID 5 may actually give better performance.
Hope this Helps!
-Josh
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тАО10-06-2003 08:49 AM
тАО10-06-2003 08:49 AM
Re: VA7410 How do you RAID yours?
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тАО10-13-2003 05:18 AM
тАО10-13-2003 05:18 AM
SolutionWe've worked this problem thoroughly with the response center and the ultimate solution was to avoid autoraid. We only started seeing this problem after the capacity upgrade, before which the VA worked flawlessly.
Next time we put in a VA, it's going in as RAID 1+0, to save us the trouble of deleting and re-creating all the LUNs to get them off RAID 5.
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тАО10-13-2003 10:08 AM
тАО10-13-2003 10:08 AM
Re: VA7410 How do you RAID yours?
You mention capacity upgrade, what do you mean by this?
Did you add extra disk enclosures?
How many?
Thanks
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тАО10-13-2003 05:07 PM
тАО10-13-2003 05:07 PM
Re: VA7410 How do you RAID yours?
we have 2 VA's installed in our environment, one configured in autoraid and one in raid 0/1. When we measured performance of one application , we see on the raid 0/1, 5 times the performance of autoraid. On the other side, if you have on the raid 0/1 VA less then 2 diskspace left, and a disk will fail, VA will try to move data from raid 0/1 to raid 5.This is so heavy, that almost no IO will come through. If you insert the new disk, well , raid 5 goes back to raid 0/1, so again performance loss.
If you need performance, configure raid 0/1, but look at the free space left.
Rgds,
Claudiu