Re: iSCSI : Concerns regarding DataRN in READ Data PDU.

[julian_satran@il.ibm.com]

Santosh,

The general assumption was that a target is resource constrained.
If a target wants acks an initiator should be able to give those to the
target.
If a target gives a large number in the DataNumber it practically says that
it can do without and will request ACK explicitly or not at all. Letting an
initiator control this might negatively impact performance for unrelated
initiators as the target will be bound to keep resources for the lazy
initiator.

I hope this clarifies the issue.

Julo

Santosh Rao <santoshr@cup.hp.com> on 14/01/2001 00:16:33

Please respond to Santosh Rao <santoshr@cup.hp.com>

To:   Julian Satran/Haifa/IBM@IBMIL
cc:   ips@ece.cmu.edu
Subject:  Re: iSCSI : Concerns regarding DataRN in READ Data PDU.




Julian,

My original request on this issue was suggesting 2 alternatives. If a WG
consensus cannot be achieved on eliminating the DataRN and all of its
complexity, I would like to re-iterate the alternative proposal that was
made, that initiators should be allowed to disable this
feature during login negotiation.

Regards,
Santosh

> > > -----Original Message-----
> > > From: Santosh Rao [mailto:santoshr@cup.hp.com]
> > > Sent: Monday, January 08, 2001 9:03 PM
> > > To: IPS Reflector
> > > Subject: iSCSI : Concerns regarding DataRN in READ Data PDU.
> > >
> > > I would like to therefore ask that :
> > >
> > > either,
> > > a) DataRN support be removed from the iSCSI draft.
> > >
> > > or
> > > b) The support for DataRN be negotiated at login time giving
initators
> > > control over this feature and allowing them to disable this feature.
> > > This will allow SCSI hardware assist engines to skip implementation
of
> > > this functionality and their associated software can merely turn off
> > > DataNumber in the login negotiation.
> > >
> > > Thanks,
> > > Santosh
> > >
> > >
> > >
> > >
>
>
>
>
>


--
#################################
Santosh Rao
Software Design Engineer,
HP, Cupertino.
email : santoshr@cup.hp.com
Phone : 408-447-3751
#################################