Adaptect raid performance with FreeBSD

[ict technician]

On Wednesday 14 January 2004 1:27 pm, Ari Suutari wrote:
> Hi,
>
> On Wednesday 14 January 2004 15:20, Karl Pielorz wrote:
> > > So, I get only about 25MB/s. Shouldn't I be getting something
> > > like 70 MB/s, or even more since there are two disks that
> > > can server read requests ?
> >
> > Hmmm, what happens if you run two of those at once?
>
> 	Running 5 dd's at once gives in iostat:
>
>       tty             da0              da1             acd0             cpu
>  tin tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
>    1  146  0.00   0  0.00  64.00 473 29.58   0.00   0  0.00   0  0  1  1 98
>    0   38  0.00   0  0.00  64.00 625 39.06   0.00   0  0.00   0  0  2  1 97
>    0   38  0.00   0  0.00  64.00 492 30.76   0.00   0  0.00   0  0  2  1 97
>    0   38  0.00   0  0.00  64.00 506 31.62   0.00   0  0.00   0  0  1  0 98
>    0   38  0.00   0  0.00  64.00 495 30.94   0.00   0  0.00   0  0  1  1 98
>
> 	The peak seems to be 39 Mb/s.
>
> > But, I can't remember seeing adjusting it making any real-world
> > difference - what happens if you max it out (e.g. 128, or 256)?
>
> 	I'll have to try this. However, I also doubt that it is not going
> 	to change anything.
>
> 		Ari S.

Where's the other CPU?
What's da0 - send dmesg output

-- 
i j hart

ICT Technician
Cardinal Newman Catholic School & Community College