Re: GUI Software Raid Monitor Software

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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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