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RAID 0 - CPU Utilization

Last response: in Storage
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June 25, 2007 11:50:14 PM

Is it normal to have 30% CPU Utilization in HDTACH?

More about : raid cpu utilization

June 26, 2007 12:56:13 AM

usually only when theres other processes taking up cpu cycles in the background
June 26, 2007 1:33:21 AM

i guess it was the stripe size, went up to 64K from 32K and now cpu usage is around 3%
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June 28, 2007 7:26:48 PM

how do you change the stripe size?



this is my 2x250gb in raid0
June 28, 2007 8:24:52 PM

From what I have read it's best to use a large stipre size 128-256kb, even larger if the contoler supports. You should get more speed with larger stripes size.
June 28, 2007 8:27:54 PM

Quote:
From what I have read it's best to use a large stipre size 128-256kb, even larger if the contoler supports. You should get more speed with larger stripes size.


but does this have to be done during a fresh install from the raid controller?
June 28, 2007 8:35:13 PM

Quote:
From what I have read it's best to use a large stipre size 128-256kb, even larger if the contoler supports. You should get more speed with larger stripes size.


but does this have to be done during a fresh install from the raid controller?

I think yes and you would have to format again. I dont think there is another way at least there shouldnt be. It's like changing the cluster size on a partition, no other way but to reformat.
June 28, 2007 9:07:06 PM

thanks i'll look into this next time i format :wink:
June 28, 2007 9:22:11 PM

Quote:
From what I have read it's best to use a large stipre size 128-256kb, even larger if the contoler supports. You should get more speed with larger stripes size.


It depends on the file sizes. If you have a 64 KB file, then that would reside entirely on one drive. However with a 32KB stripe, it would sit across more spindles.

Thus, it's best to test with your apps and see what works best for you. There's no silver bullet here.
June 28, 2007 10:33:59 PM

128kb was the highest my controller would go, and it was a little slow for me, even in synthetic benchs.. 32K was fast, but had a high cpu usage.
June 29, 2007 4:02:33 PM

Larger stripes will be better for games and video editing. Who really care about the rest?

I only care if I am first on a battlefield server when new map loads.
June 29, 2007 10:47:55 PM

thats true, my games load faster with 64KB, but only by a couple of tenths of a second.
!