On Sun, 10 Oct 2004, Robin Bowes wrote:
> This gave the following results:
>
> Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
> -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
> dude.robinbow 3096M 13081 95 34159 75 12617 21 15311 92 40429 30 436.1 3
> dude.robinbowes.com,3096M,13081,95,34159,75,12617,21,15311,92,40429,30,436.1,3,,,,,,,,,,,,,
>
> I don't actually know what the figures mean - is this fast??
It's not brilliant, but reasonable for a RAID5 on IDE drives. Disk head
bandwidth for comodity 7200 RPM drives is about 55MB/sec peak - although I
haven't been able to get that with the SATA controllers I've used so-far,
but I suspect thats because they are running in PATA mode.
This is a Dell with 4 SCSI drivers split over 2 controllers:
Version 1.02b ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
pixel 2000M 20492 72 54865 12 28260 6 25413 86 108190 13 332.9 0
This is a dual-Athlon with 5 IDE drives (4+hot spare)
Version 1.02b ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
red 1023M 14216 99 26663 25 17697 13 13767 95 72211 34 239.5 2
This is anothe dual athlon with just 4 IDE drives:
Version 1.02b ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
blue 1023M 12003 99 40147 44 24048 19 12078 98 87887 46 232.6 2
Your block input seems a shade low, but this is what I experienced on a
server with SATA drives which look like /dev/hdX drives. I suspect the
drivers have a bit more development to go through though.
And in any-case, depending on what you are using it for, it's probably
fast enough anyway... 100Mb Ethernet can only chuck files out at 10MB/sec
anyway, but it's always nice to have bandwidth in-hand!
Gordon
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