[Stgt-devel] FirstBurstLenght > MaxBurstLength --> error

[FUJITA Tomonori]

From: Albert Pauw <albert.pauw at gmail.com>
Subject: [Stgt-devel] FirstBurstLenght > MaxBurstLength --> error
Date: Sun, 15 Apr 2007 11:33:27 +0200

> Running the test regression script of open-iscsi on stgt I found an 
> error, which I did not encounter with other targets.
> 
> It is test #17 with the following parameters:
> 
> ================== TEST #17 BEGIN ====================
> ImmediateData = No
> InitialR2T = No
> HeaderDigest = None
> DataDigest = None
> FirstBurstLength = 8192
> MaxBurstLength = 4096
> MaxRecvDataSegmentLength = 4096
> MaxOutstandingR2T = 1
> 
> I get the error "Invalid burst lengths first_burst 8192 max_burst 4096" 
> in /var/log/messages and the login breaks of.
> According to the RFC 3720 "FirstBurstLength MUST NOT exceed 
> MaxBurstLength" (chap 12.14), which means that the target
> should answer back with a FirstBurstLenght parameters equal to 
> MaxBurstLenght.
> 
> I investigated with wireshark and found that this is exactly the 
> behaviour of the Wasabi Storagebuilder target,
> iscsi-target silently accepts FirstBurstLength > MaxBurstLength, and 
> stgt only gives an error.

Thanks a lot.

I put it on my to do list since it's a bit tricky to handle this.

BTW, would it better for open-iscsi not to send invalid parameters?