RE: iSCSI:Target Centric ISID assignments

[sandeepj@research.bell-labs.com (Sandeep Joshi)]

Agree with the extra responsibility added on the target.

But one point here ..the target may not be monolithic
but one assumes it would atleast be "monogenic" (single-vendor)
thereby enabling it to disallow multiple nexuses being
started with the same <initiatorName,ISID>

The monogenic property may not hold for initiators so 
a scheme which works without HBA cooperation is preferred
over one which requires cooperation.   

The schemes presented by Jim in a previous email (a windows 
registry counter) still assume all HBAs follow that 
assignment model.

The ISID namespace seems too small to partition among
vendors.  If it were possible to add a vendor-unique
identifier to the login command/phase (and maybe nexus), 
we may solve the problem without burdening the target.

-Sandeep

> Blowing away or not is again with us. A careless guy will set always the
> blow-away bit.
> You have just moved the management responsibility to the target under the
> assumption that the target
> is "monolithic". But, as you well know, this is not true for many targets.
> You have to have an allocation scheme at
> target and a garbage collection.
> 
> I suggest we give this to the ND team and let them debate for a while
> before getting back to us.
> We may want to have them look at all aspects of SSID allocation and use.
> 
> Julo