RE: iSCSI: clearing SCSI objects

[Eddy Quicksall <eddy_quicksall@ivivity.com>]

Thanks, that was the missing link I think ... I thought since
DefaultTime2Wait & DefaultTime2Retain were only for ErrorLevel 2 because
that is said in the logout regarding Time2Wait and Time2Retain. But if the
default versions apply to ErrorLevel 0, that is exactly what I want.

Also, paragraph 12.16 does not talk about exceeding DefaultTime2Retain
causing an I_T Nexus Loss notification (which is the only iSCSI thing that
can clear a SCSI object).

Can you confirm that the following would be correct?

- I negotiate for ErrorLevel 0
- I negotiate for DefaultTime2Wait and DefaultTime2Retain = 0
- I get a logout
- I clear all SCSI objects other than the ones you mention below.

Eddy

-----Original Message-----
From: Mallikarjun C. [mailto:cbm@rose.hp.com] 
Sent: Thursday, May 01, 2003 8:34 PM
To: ips@ece.cmu.edu
Subject: Re: iSCSI: clearing SCSI objects

> First, am I correct in the above?

Not completely.  If there are no active FFP connections
in the iSCSI session, the session will eventually come to 
an end ([Default]Time2Wait/Return).  That is when the
associated I_T Nexus Loss notification is generated, and 
with it, all the SCSI objects that are considered attributes of 
that instance of I_T Nexus are cleared.

Note however that there may be SCSI objects that are
not linked to the life of an instance of I_T Nexus - this is
a SCSI issue (and F.2 does refer to it).
--
Mallikarjun

Mallikarjun Chadalapaka
Networked Storage Architecture
Network Storage Solutions
Hewlett-Packard MS 5668 
Roseville CA 95747
cbm@rose.hp.com

----- Original Message ----- 
From: "Eddy Quicksall" <eddy_quicksall@ivivity.com>
To: <ips@ece.cmu.edu>
Sent: Thursday, May 01, 2003 11:58 AM
Subject: clearing SCSI objects


> I have a concern regarding a logout followed by login's with a different
> ISID from the same initiator device.
>  
> Here is my concern:
>  
> -          the target must keep state information for the initiator port
> after a logout (such as a reservation - but not limited to that). This is
> because section F.2 says only an I_T Nexus Loss can effect clearing
actions
> on SCSI objects.
> -          If a target receives a logout, then another login from another
> initiator (or even another login from the same initiator device but a
> different ISID) then it must have resources available because it can't
clear
> the SCSI objects from the logged out session.
> -          The resources can become stale and the target could run out of
> resources.
>  
> First, am I correct in the above? If not please explain.
>  
> If this is correct, I have not found anything in the spec that says how
long
> the SCSI objects must be kept around. 
>  
> Eddy
>  
>