ISCSI slow to read from DELL MD3000i

[Sossi Andrej]

Danny Braniss wrote:
>> 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?...
>>
>>     
>
> man -k iscsi
> iscontrol(8)             - login/negotiator/control for an iSCSI initiator 
> session
> iscsi.conf(5)            - key options to be negotiated in an iSCSI session
> iscsi_initiator(4)       - kernel driver for the iSCSI protocol
> iscsi-target(8)          - service remote iSCSI requests
> targets(5)               - configuration file for iSCSI targets
>
>   
>> 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
>>
>>     
> did you recompile the driver?
>   
Yes, I recompiled all kernel source. I do many test whit and without 
module. Is it necessary to post my kernel configuration?
>   
>> Is it possible to manage more than 4 disk without degrading the performance?
>>
>>     
> are you sure that da4,5,6 actually are disks? they might be just files ...
> ls -ls /dev/da? 
>   
# ls -ls /dev/da*
0 crw-r-----  1 root  operator    0,  87 Jan 14 12:12 /dev/da0
0 crw-r-----  1 root  operator    0,  92 Jan 14 12:12 /dev/da0s1
0 crw-r-----  1 root  operator    0,  95 Jan 14 12:12 /dev/da0s1c
0 crw-r-----  1 root  operator    0,  96 Jan 14 12:12 /dev/da0s1d
0 crw-r-----  1 root  operator    0,  93 Jan 14 12:12 /dev/da1
0 crw-r-----  1 root  operator    0,  99 Jan 14 12:12 /dev/da1s1
0 crw-r-----  1 root  operator    0, 106 Jan 14 12:12 /dev/da1s1c
0 crw-r-----  1 root  operator    0, 107 Jan 14 12:12 /dev/da1s1d
0 crw-r-----  1 root  operator    0,  94 Jan 14 12:12 /dev/da2
0 crw-r-----  1 root  operator    0, 100 Jan 14 12:12 /dev/da2s1
0 crw-r-----  1 root  operator    0, 108 Jan 14 12:12 /dev/da2s1c
0 crw-r-----  1 root  operator    0, 109 Jan 14 12:12 /dev/da2s1d
0 crw-r-----  1 root  operator    0,  97 Jan 14 12:12 /dev/da3
0 crw-r-----  1 root  operator    0, 104 Jan 14 12:12 /dev/da3s1
0 crw-r-----  1 root  operator    0, 112 Jan 14 12:12 /dev/da3s1c
0 crw-r-----  1 root  operator    0, 113 Jan 14 12:12 /dev/da3s1d
0 crw-r-----  1 root  operator    0,  98 Jan 14 12:12 /dev/da4
0 crw-r-----  1 root  operator    0, 105 Jan 14 12:12 /dev/da4s1
0 crw-r-----  1 root  operator    0, 114 Jan 14 12:12 /dev/da4s1c
0 crw-r-----  1 root  operator    0, 115 Jan 14 12:12 /dev/da4s1d
0 crw-r-----  1 root  operator    0, 101 Jan 14 12:12 /dev/da5
0 crw-r-----  1 root  operator    0, 110 Jan 14 12:12 /dev/da5s1
0 crw-r-----  1 root  operator    0, 116 Jan 14 12:12 /dev/da5s1c
0 crw-r-----  1 root  operator    0, 117 Jan 14 12:12 /dev/da5s1d
0 crw-r-----  1 root  operator    0, 102 Jan 14 12:12 /dev/da6
0 crw-r-----  1 root  operator    0, 111 Jan 14 12:12 /dev/da6s1
0 crw-r-----  1 root  operator    0, 118 Jan 14 12:12 /dev/da6s1c
0 crw-r-----  1 root  operator    0, 119 Jan 14 12:12 /dev/da6s1d


Initially I work with 4 disks for real data and then create another 3 
for tests data. Disks da4,5,6 is identical configured on the NAS as first 4.
>   
>> Thanks in advance.
>>
>>     
>
> chiao :-)
>
> 	danny
>   
>> [...]


-- 
Sossi Andrej
-------------------------
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