jvalidolnx@xxxxxxxxxxxxxxxxx wrote:
> I was very impressed with the performance I got on CentOS 5.6
> using software Raid 10 so I'm looking. Thanks
There are 3 ways to setup RAID 10 on Linux (mdadm). There are -n2 -f2
and -o2 options (near, far and offset) and best for ordinary use is
far (f2).
Here is some numbers from:
http://blog.jamponi.net/2007/12/some-raid10-performance-numbers.html
# the kernel is 2.6.22.12, openSUSE "default" kernel
# the CPU is an AMD x86-64, x2 3600+ in power-saving mode (1000 MHz)
# the MB is an EPoX MF570SLI which uses the nVidia MCP55 SATA (PCIe)
# the drives are 3 different makes of SATA II, 7200 rpm
# each drive is capable of not more than 75 MiB/s (at best - the
outermost tracks) and closer to 70 MiB/s the
In MiB/s
level format Writing Reading Writing Reading
(Degraded)(Degraded)
raid5 left-asymmetric 55 129 46 124
raid5 left-symmetric 54 123 50 122
raid5 right-asymmetric 54 124 49 124
raid5 right-symmetric 54 128 49 116
raid10 n2 103 95 103 104
raid10 o2 102 94 100 102
raid10 f2 97 162 97 51
raid0 - 205 186 n/a n/a
Or in indexes:
level format Writing Reading Writing Reading
(Degraded)(Degraded)
raid5 left-asymmetric 0.8 1.8 0.7 1.8
raid5 left-symmetric 0.8 1.8 0.7 1.7
raid5 right-asymmetric 0.8 1.8 0.7 1.8
raid5 right-symmetric 0.8 1.8 0.7 1.7
raid10 n2 1.5 1.4 1.4 1.4
raid10 o2 1.5 1.4 1.4 1.4
raid10 f2 1.4 2.3 1.4 0.7
raid0 - 3.0 2.8 n/a n/a
Ljubomir
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