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software raid - Intel vs AMD CPU usage?

T

Thuleman

Supreme [H]ardness
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Apr 13, 2004
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When considering Linux software raid via LVM is there an advantage of running it on an AMD system over an Intel system? Something about SMP Intel still being limited to a single CPU to manage the interrupt controller? Can't seem to find an answer to this on The Google.
 
Not really. Both will have less than 10% CPU usage on a single core while reading or writing. Rebuilds will be more however you can control how much you want to allow. And I know this because I have 12 to 15 linux software raid arrays at work with some on Intel and some on AMD processors.
 
I am still not quite clear on this. For example, I could fit 36 or 45 drives into one of the newer Supermicro cases. If I software raid them I could end up with say 3 arrays or 12 or 15 drives each. Is running those three arrays really only going to take up 10% (give or take) of a single core? That seems rather low.
 
Is running those three arrays really only going to take up 10% (give or take) of a single core? That seems rather low.
Click to expand...

I do not have that many drives in an array however my 9/10 drive raid6 arrays max out at around 7% cpu usage on 1 core of a core2quad. And the last time I checked I was getting well over 500 MB/s reads with that.

BTW, on top of that newer kernels support multithreaded raid5/6. It does not seem to do much for normal reads and writes but it really helps rebuilds as my 9 disk raid6 array with 2TB hitachis rebuilds in less than 9 hours total.
 
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