W liście z wto, 18-01-2005, godz. 20:18, J. Ryan Earl pisze: 
> I missed that, sounds like you got an IDE concurrency problem.  Perhaps you
> can't read from both ports for some reason.  Don't think it's a raid problem
> though.


well, it is a raid problem. Check it out. I've ran the following script:

hdparm -t /dev/hdg &
hdparm -t /dev/hde

(hde and hdg creates my md6 array from previous message)

And there are results:

--disk/hdg----disk/hde-
_read write _read write
   0     0 :   0     0
40.2M    0 :39.9M    0
53.5M    0 :53.5M    0
51.5M    0 :51.5M    0
13.2M    0 :13.5M    0
   0     0 :   0     0

Even if I increase number of reading threads

hdparm -t /dev/hdg &
hdparm -t /dev/hde &
hdparm -t /dev/hdg &
hdparm -t /dev/hde

the workload is more or less evenly distributed.

--disk/hdg----disk/hde-
_read write _read write
   0     0 :   0     0
40.2M    0 :38.9M    0
7732k    0 :8440k    0
3780k    0 : 928k    0
1280k    0 :2400k    0
2076k    0 :   0     0
   0     0 :   0     0

Janusz
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