Re: iscsi : default iscsi mode page settings - Consensus call

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

Ralph Weber wrote:
> 
> Santosh,
> 
> I was not aware that you were proposing that iSCSI
> not support the Disconnect-Reconnect mode page at
> all.  Now that would be a radical step.


Ralph,

The intent was that iscsi not specify any iscsi specific mode pages (as
Julian brought up a few days ago.). Could you please clarify why & how
would this be in violation of SPC-2, in particular, commenting on the
following clarifications that I previously sought :

Where in the SPC-2 definition is the application assured that :

a) the disconnect-reconnect page code is required to be supported on all
targets.

b) all or any specific fields of the disconnect-reconnect field
definitions will be available to the application across all of the SCSI
transports.

In the absence of the above 2 assurances to applications, how would
iscsi be breaking any legacy applications by taking this "radical" step.
(?)

IMHO, the parameter rounding mechanism renders the mode sense/select
mechanism of parameter negotiation inefficient, when compared with a
text key based scheme, and the intent of these changes is to simplify
the negotiation of these parameters and localize them to iscsi specific
efficient negotiation schemes like the current text key negotiation. 


Thanks & Regards,
Santosh



> If on the other hand you are proposing that iSCSI
> have a Maximum Burst Size but refuse to provide
> that information in the Disconnect-Reconnect mode
> page whose page code iSCSI devices accept, then
> I think you are at least violating the ISP charter
> as regards interactions with T10 standards (specifically
> SPC-2).
> 
> This is my rather strongly held opinion and unless
> you find an argument that is substantially better
> than anything presented to date I expect to maintain
> this opinion to the bitter end.
> 
> Ralph Weber

-- 
##################################
Santosh Rao
Software Design Engineer,
HP-UX iSCSI Driver Team,
Hewlett Packard, Cupertino.
email : santoshr@cup.hp.com
Phone : 408-447-3751
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