Re: iSCSI: response to second login (with same ISID)

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

Matt,

The issue spans beyond just an orderly vs. non-orderly shutdown. Some
user application may be performing raw I/O access to an iSCSI device
when the system may be shutdown. The logout operation itself may fail
(usually a don't care for the drivers.). 

What is wrong with FC semantics of a login causing an implicit logout.
It allows for clean up of old stale sessions. 

Regards,
Santosh

Matt Wakeley wrote:
> 
> Santosh Rao wrote:
> 
> > In the event where the initiator went through a non-orderly shutdown
> > which did not close all sessions, it would attempt to re-login on
> > re-boot with the same ISID. If the target rejected this re-login, per
> > (1) (citing an invalid ISID), the initiator would no longer be able to
> > maintain persistence of the session to an ISID.
> 
> In this case, the initiator is at fault (it performed a non-orderly
> shutdown).  Hence, when it logs in with the target, the target comes back and
> says, "bad initiator, you're already logged in with me".  The initiator can
> then say "oh yeah, ok, let's clean up" and perform an orderly shutdown of the
> session.
> 
> > b) Using (2) allows the hosts to hint to the target that the previous
> > session is now stale and thus triggers clean-up of stale session
> > resources.
> 
> Rather than "hint", I think explicite cleaning up is better.
> 
> -Matt
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