Hi raiders again,
> I have been having these sorts of problems for a fair while, my opinon (and
> thats all it is) is that raid cant handle much more than 40MB/s,
> irespective of your setup, i think theres some other limiting factor
>
> Ive gotten ~35MB/s with 3 udma33 drives, each its own channel, i got no
> timeouts.
>
> When i reconfigured it to 4 drives i saw a small performance increase, but
> the results were suspect as i could test with large file sizes as i would
> get timeouts etc (as your seeing).
>
> Actually now i think about it, just yesterday i got timeout errors under
> heavy load just copying between non-raid partitions (copying 3 GB from one
> drive to another) , the CPU usage is pretty high as well.
>
> Do you ever get timeouts other than in raid partitions ?
>
actually we just use the drives under RAID, so never tried
with non-raid partitions.....
But if I understand you right, your are getting yours with UDMA33????
So far I did not get any at all with UDMA33! And I was once running a
2Gig
bonnie as well as a 3Gig cp and a 3 Gig tar in parallel, and no errors,
while
with the UDMA66 I would have gotten dozens of them and the system would
have
hung....
>
> Id be happy is it was my cables (as you suspect your problem is) but im
> sceptical.
It's either the cables for us or sth else intrinseque to UDMA66, but I
guess
the
cables or the cases...
When I searched for the errors on deja.com in most of the cases the
proposed
solution
was: fix your cable lenght....
>
>
> I guess youve read the warning in the kernel archive about how using hdparm
> can cause these sorts of problems.
>
not really actually, but sounds like a good idea...:-)
remo
