On 09/26/2009 09:20 PM, niko scsi wrote:
> I followed the howto 
> http://tldp.org/HOWTO/SCSI-Generic-HOWTO/scsi_snd_cmd.html
> to pass through scsi cmd with data (self defined,target can handle
> it)  to iscsi disk.
>   however,the request was handled six times ,I checked the log ,the
> reason is shown below. The connection failed and recovered six
> times ,and I tested many times ,each time ,the same :six times!
> I'm newbie to scsi program. Any idea that can cause this problem ?
>
> error occurred in function iscsi_data_rsp
>
> tcp debug infomations show below :
>
> .......................................
> Sep 27 09:37:01 localhost kernel: tcp: skb dfab65c0 ptr=da5a5a54
> avail=60
> Sep 27 09:37:01 localhost kernel: tcp: copied 0 0 size 48 recv
> Sep 27 09:37:01 localhost kernel: tcp: iscsi_tcp_segment_recv copying
> 48
> Sep 27 09:37:01 localhost kernel: tcp: copied 0 48 size 48 recv
> Sep 27 09:37:01 localhost kernel: tcp: iscsi_tcp_segment_unmap
> cb76be10
> Sep 27 09:37:01 localhost kernel: tcp: total copied 48 total size 48
> Sep 27 09:37:01 localhost kernel: tcp: segment done
> Sep 27 09:37:01 localhost kernel: tcp: opcode 0x25 ahslen 0 datalen 12
> Sep 27 09:37:01 localhost kernel: tcp: iscsi_data_rsp: ctask-
>> exp_datasn(1) != rhdr->datasn(0)

You might not be doing anything wrong. It might a target or initiator bug.

What target are you using? In your setup, did you modify the iscsi 
target in some way?

And what kernel are using?

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