ISCSI slow to read from DELL MD3000i

Sossi Andrej asossi at dotcom.ts.it
Wed Jan 14 03:56:40 PST 2009


Danny Braniss wrote:
>> Danny Braniss wrote:
>>     
>>>> Danny Braniss wrote:
>>>>     
>>>>         
>>>>> wups, didn't read all your mail, sorry,
>>>>> try increasing tht tag opening, in the config file add
>>>>> 	tag = 64
>>>>> for example, or via camcontrol
>>>>>
>>>>> danny
>>>>>   
>>>>>       
>>>>>           
>>>> I modify my iscsi.conf by adding tags = 64 (and no tag). Now works fine, 
>>>> about 43MB/s. Thank You very match.
>>>>
>>>>         
> RTFM :-)
>
> [...]
> danny
>   
In last 2-3 months I searched the (F) manual, but I didn't find any! 
Where is the manual?...

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

Is it possible to manage more than 4 disk without degrading the performance?

Thanks in advance.

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

Via Biancospino, 9
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tel: +39 040 2158191
fax: +39 040 0641954
E-mail: asossi at dotcom.ts.it
----------------------------

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