[ILUG] Hardware Raid.

[Wesley Darlington]

Hi All,

On Fri, May 18, 2001 at 04:43:39PM +0100, John Ronan wrote:
> I wonder could someone tell me how these figures look, as I'm new to hardware
> raid.
> 
> Dual PIII 933 with 1GB Ram, 2.2.19smp kernel
> SmartArray 3200 with 64MB, It won't let me enable write back caching on the
> drives which are 4 X 36.4GB 10K's
> 
>               -------Sequential Output-------- ---Sequential Input-- --Random--
>               -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
> Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec %CPU
> m1       1500  8726 65.7  9331  5.2  5740  8.4  9482 65.9 57447 30.9 785.8 7.7

IMHO...

Sequential charwise output: 8.7MB/s    Respectable
Sequential blockwise output: 9.3MB/s   Awful, (1)
Sequential blockwise rewrite: 5.7MB/s  Not great. (1)

Sequential charwise input: 9.4MB/s     Respectable
Sequential blockwise output: 57.4MB/s  Nice! :-)

Random Seeks: 785.9/s                  Wow! You sure the test was big enough...?

(1) To be expected with raid5 without writeback. This is raid5, I take it?

HTH,
Wesley.