Looks like my RAID5 arrays have crap performance - esp. the master array.
Is it something to do with the master/slave thing, or something else?
Comments?
Max.
/dev/md0 is 2xWD2000 SATA via m/b - RAID0
=========================================
------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
3G 49056 88 136360 33 38863 10 52577 88 115880 16 389.6 1
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2213 24 +++++ +++ 6623 73 7286 67 +++++ +++ 5289 57/dev/md1 is 4xWD800 PATA RAID5 master array
===========================================
------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
3G 31272 59 34758 8 9009 3 16343 28 19788 3 265.3 1
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 506 8 +++++ +++ 574 7 530 10 +++++ +++ 367 5/dev/md2 is 4xWD2000 PATA RAID5 slave array
===========================================
------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
3G 44201 78 43174 11 14761 6 38522 67 66666 14 359.4 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 1098 14 +++++ +++ 1131 16 1118 17 +++++ +++ 1006 15Max Waterman wrote:
Hi,
So, I did try this (two RAIDs, one as all master devices and one as all slaves devices) and it seems to work OK.
I had a bit of a problem making the slave plugs reach the drives. With all the drives as master devices, I got the full one meter length and there was no problem, but the slave plug is not the full length and so was a struggle. Far from ideal, but I'm short of cash, so I had to try.
What I am not sure about is the performance. I have run bonnie++ on the arrays (plus another 2x250GB RAID0 array, running off the motherboard SATA controller), but haven't really looked at the results. I'll post them here tonight.
BTW, I was considering trading in my EIDE drives for 8xWD2000 SATA drives and getting a Supermicro 8-port SATA controller :
http://www.supermicro.com/products/accessories/addon/DAC-SATA-MV8.cfm
It looks like just the job. Just thought I'd mention that board in case other people have been looking for something similar. They tell me it works on PCI as well as PCI-X.
Max.
Paul Barker wrote:
Hi
I'll give it a try since the alternative (two 4 channel s/w RAID boards)
yet is more money ;)
Cool, let me know how you get on. I'd be interested if it works !
Cheers
Paul
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