Benchmarking hardware RAID vs. Linux kernel software RAID
Posted by: Anonymous
[ip: 213.237.47.228]
on July 15, 2008 05:27 PM
Interesting article on HW vs SW raid. I would like more of this.
I think yo could have tested more raid-10 layouts, the n2 layout is standard, but a number of tests have shown that this layout is the slowest, the f2 and o2 layouts are faster. And as you do not know which layout the Adaptec controller is using - they could well use some improved layout - then you could also have used linux SW raid enhanced layouts. After all, this is about getting the most out your hardware. The raid10,f2 and o2 capabilities come for free with the kernel.
You may actualy have gotten more out of your disks if you just had put it on the mobo SATA controller, The first graph indicate that the mobo delivers 90 MB/s while the adaptec card only delivers 70 MB/s.
For 800 USD you could have gotten some cheaper controller and then some more disks, this would most likely have bought you more space and more performance. I think you could have got 2 disks more + a faster SATA controller.
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Benchmarking hardware RAID vs. Linux kernel software RAID
Posted by: Anonymous [ip: 213.237.47.228] on July 15, 2008 05:27 PMI think yo could have tested more raid-10 layouts, the n2 layout is standard, but a number of tests have shown that this layout is the slowest, the f2 and o2 layouts are faster. And as you do not know which layout the Adaptec controller is using - they could well use some improved layout - then you could also have used linux SW raid enhanced layouts. After all, this is about getting the most out your hardware. The raid10,f2 and o2 capabilities come for free with the kernel.
You may actualy have gotten more out of your disks if you just had put it on the mobo SATA controller, The first graph indicate that the mobo delivers 90 MB/s while the adaptec card only delivers 70 MB/s.
For 800 USD you could have gotten some cheaper controller and then some more disks, this would most likely have bought you more space and more performance. I think you could have got 2 disks more + a faster SATA controller.
There is a wiki on Linux SW raid on http://linux-raid.osdl.org/
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