Re: iscsi : default iscsi mode page settings.

[Santosh Rao <santoshr@cup.hp.com>]

"Sanjeev Bhagat (TRIPACE/Zoetermeer)" wrote:

> I think the FirstBurstSize be kept as login key but here we will have a
> problem as to which value be over-ridden whether the one sent by initiator
> or target.

Sanjeev,

I don't think there is an ambiguity on which value is to be accepted. The final
negotiated value is agreed upon by both parties. See below definition of
numerical key negotiation, taken from Section 2.2.4 of Rev 7.97 :

" In numerical negotiations, the offering and responding party state a
numerical value. The result of the negotiation is key dependent; frequently the
lower or the higher of the two values is used. "

By defining the FirstBurstSize as a login key and specifying that the lower of
the 2 numbers is accepted, there is no ambiguity over the final chosen value.
This is true of all numerical negotiations. See the definition of
MaxConnections as an example :

"MaxConnections=<number-from-1-to-65535>

Default is 8.

Initiator and target negotiate the maximum number of connections
requested/acceptable.  The lower of the 2 numbers is selected."

Regards,
Santosh


> This depends upon whether
>
> a. the iSCSI target should be made so efficient as to support different
> values of Firstburstsize for different initiators. If it is so then the
> target accepts the Initiator value. This increases complexity on target side
> or
> b. the iSCSI target should operate on one particular mode of FirstBusSize.
> If it is so then initiator accepts target value. But in this case also I
> foresee a problem in this case when multiple intiators are accessing a iSCSI
> target and one of the iSCSI initiator changes the value of FirstBusSize
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