ISCSI slow to read from DELL MD3000i

Sossi Andrej asossi at dotcom.ts.it
Thu Jan 15 07:58:45 PST 2009


Danny Braniss write:
> [...]
>   
>>>> In this week I did many tests on ISCSI and found another problem with 
>>>> slow writing. I created 7 virtual disk on my NAS server. The first 4 
>>>> disks (/dev/da0 - /dev/da3) work fine, the other 3 (/dev/da4 - /dev/da6) 
>>>> are slow.
>>>> I found this depends from parameter ISCSI_MAX_LUNS defined in file 
>>>> iscsi.h, set 4. I tried to increase this value, but with all values 
>>>> higher of 4 the initiator prints error:
>>>> iscontrol[602]: ISCSIGETCAM failed: 25
>>>>
>>>>         
> arg, I will fix this in the next release, but for now, recompile iscontrol too.
>
> [...]
>
> danny
>   
I forgot to compile iscontrol. Sorry. Now it works fine.
R/W speed is now ~48Mb/s on disks da0-3 and ~32Mb/s on disks da4-6. I 
set ISCSI_MAX_LUNS at value 16. Speed 32Mb/s is good for my job, but... 
why is there this difference?
Thanks for another reply.

-- 
Sossi Andrej
-------------------------
DotCom Information technology

Via Biancospino, 9
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tel: +39 040 2158191
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E-mail: asossi at dotcom.ts.it
----------------------------

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