Re: Send Reject PDU when orignal to-be-rejected PDU is notavailable

[HUJason <hzj_wuying@xxxxxxxxxxx>]

Hi David,

Thank you for the suggestion. A little more to consider is that it seems that whatever mechanisms we use, as a target, we must reserve all PDU header comes from Initiator until the coressponding statSN is explicitly acked. For a resource-limted iscsi target engine(all SCSI data is on host, so it is not in this question), It can be considered as a big memory consumer and becomes a bottlenack.


Best Regards,
Jason

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From: Black_David@xxxxxxx
Subject: RE: Send Reject PDU when orignal to-be-rejected PDU is notavailable
Date: Tue, 15 Apr 2008 23:04:15 -0400
To: hzj_wuying@xxxxxxxxxxx; ips@xxxxxxxx

The original PDU header has to be sent back so that the initiator

knows what was rejected.  iSCSI has a number of mechanisms that

can be used by the target to control resource consumption and

those should be used to ensure that adequate resources are

available to deal with the PDU that is to be rejected.

 

Thanks,

--David

----------------------------------------------------
David L. Black, Distinguished Engineer
EMC Corporation, 176 South St., Hopkinton, MA  01748
+1 (508) 293-7953             FAX: +1 (508) 293-7786
black_david@xxxxxxx        Mobile: +1 (978) 394-7754
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From: ips-bounces@xxxxxxxx [mailto:ips-bounces@xxxxxxxx] On Behalf Of HUJason
Sent: Tuesday, April 15, 2008 9:59 PM
To: ips@xxxxxxxx
Subject: Send Reject PDU when orignal to-be-rejected PDU is notavailable

Dears,

I am curently implement iscsi target on a resource-limted device. In my implementation, orignal to-be-rejected PDU is not available when it realised that a Reject should be sent to initiator.
 
But as RFC3720 said, Target must send back the orignal PDU as the Reject's payload.
 
So my question is: Why we need to send back the orignal PDU ? Can we simply eliminate it?
 
Thanks!

Best Regards,

Jason 

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