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RAID Stripe Size: 1MiB+?

post #1 of 8
Thread Starter 
I have three 250GB drives I've configured for RAID 5 under Linux MD RAID. The array will be storing ISOs and big AVIs. I know I can go up to a 4MiB stripe size, but is it worth it? Has anyone played with stripe sizes at 1MiB or higher?

Many thanks.
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post #2 of 8
I envision a crapton of wasted space.

When I made my RAID5 array there was about a 10 MB/sec jump in sequential read going from 64KB to 128 KB stripes. There was no gain whatsoever to move to a 256 K stripe, so did not go higher.

This was using 4x 750 GB drives in an mdadm RAID 5 array which seemed to get around ~265 MB/sec or so when it was built.
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post #3 of 8
I tried with my PERC6 card when I first got it and there wasnt any gains past 256KB stripe
post #4 of 8
Thread Starter 
OK, many thanks for that.

Quote:
Originally Posted by beers View Post
I envision a crapton of wasted space.
Would it be fair to say that bigger stripe sizes work better on larger capacity drives? Or do other things affect its effectiveness and efficiency?
Edited by parityboy - 12/19/10 at 1:09pm
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post #5 of 8
Quote:
Originally Posted by parityboy View Post
Would it be fair to say that bigger stripe sizes work better on larger capacity drives? Or do other things affect its effectiveness and efficiency?
Bigger stripes will work better on higher density platter drives and more spindles, so each drive in turn has time to cache it's next stripe while the others are bursting out their data to the controller.
post #6 of 8
Thread Starter 
Ahh, ok yeah makes sense. Cheers

Edit:

Is there a rule of thumb that can be applied to a proposed array configuration, for determining the optimal stripe size based on platter density, number of spindles and the minimum size of the files to be stored on the array, in order to reduce the number of tests that would have to be performed to find an optimal size?
Edited by parityboy - 12/19/10 at 7:53pm
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post #7 of 8
no rule, just a general idea.

But the differences between stripe sizes for storage arrays is not really massive once you get above 256/512 anyway. I'd just set it to 256 and be done with it, since you'll never tell the difference in usage anyway. More spindles will always help as well, and will make more difference than messing with stripe sizes.
post #8 of 8
Thread Starter 
Ok, thanks.
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