Re: Software vs Hardware RAID 10?
On Tue, Aug 28, 2007 at 02:16:52PM +0200, Goswin von Brederlow wrote:
> On the other hand raid6 will make 2 disk failures survivable, any
> two disks. If you can afford the cpu overhead for software raid6 I
> would allways prefer raid6 over a raid10 with 4 disks. With 6 disks
> too where raid6 also has more space and might be faster (at the cost
> of cpu usage).
IMHO the CPU usage difference is not that important. What is more
important that now you have to send the same amount of data over the bus
_3 times_ compared to the 2 times for RAID1/4/5/10. So if you really
need RAID6 then a good HW RAID card becomes quite attractive.
I also fail to see RAID6 can be faster than RAID10, unless your I/O
pattern happens to interact rather badly with the on-disk layout of
RAID10.
Gabor
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MTA SZTAKI Computer and Automation Research Institute
Hungarian Academy of Sciences
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