external raid arrays
Tim Carlson
tim.carlson at pnl.gov
Thu Feb 21 15:07:06 PST 2002
On Thu, 21 Feb 2002, Velocet wrote:
> We get 54Mb/s read and 44Mb/s write with raid 0+1 on 10Krpm IBM LVD 160
> drives with 1 controller. I would expect, with suitably fast CPUs (ours
> is a Tbird 900) and 66/64 pci slots with some nice Tekram (we swear by
> these) or Adaptec controllers that 4 of them with 12 10Krpm drives would
> probably easily net you over 100MB/s read and write.
Here are bonnie numbers on a Dell 530 Dual 1.7Ghz box with an Adaptec
39160 card using both channels to a Dell PowerVault array filled with 8
36Gig U160 drives. This is a flat raid 0. Basically, it is fast as hell
:). You can't get this fast with hardware raid under Linux. For hardware
raid, the Dell Perc3 cards (Megaraid based) give poor performace. The
Adaptec 3210S outperforms the Perc3 by a fair amount, but software raid
beats them all hands down.
Version 1.01d ------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
6240M 19900 99 214098 68 88136 38 19648 97 229752 51 372.4
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2745 100 +++++ +++ +++++ +++ 2817 100 +++++ +++ 5922 99
Tim Carlson
Voice: (509) 376 3423
Email: Tim.Carlson at pnl.gov
EMSL UNIX System Support
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