RE: iSCSI: Need to Kill Session from Surviving Node

["John Hufferd" <hufferd@us.ibm.com>]

OK, let me see if I can stretch it a bit more.  The key to what you said,
is for the Initiator needs to be sending something to the target, not just
waiting.  So if the Initiator always sent a Nop-Out after some period of
time of inactivity from the target, (hopefully a lot smaller time then the
TCP/IP Time Out) then the Fail-Over node would be able to cause the failure
reasonably quickly by returning ICMP Destination Unreachable.

If I have it right, it seems straight forward, but of course you need to
take over the IP Address.


.
.
.
John L. Hufferd
Senior Technical Staff Member (STSM)
IBM/SSG San Jose Ca
(408) 256-0403, Tie: 276-0403,  eFax: (408) 904-4688
Internet address: hufferd@us.ibm.com


Black_David@emc.com@ece.cmu.edu on 03/15/2001 06:26:44 PM

Sent by:  owner-ips@ece.cmu.edu


To:   John Hufferd/San Jose/IBM@IBMUS, Robert.Elliott@compaq.com
cc:   ips@ece.cmu.edu
Subject:  RE: iSCSI: Need to Kill Session from Surviving Node



> What I was trying to get at is ---  trying to enable the
> Surviving Node (which has no TCP/IP state from the Failing
> node) to get the Initiator, which had a previous Session with
> the Failing Node to take actions right away, and not wait
> for its TCP/IP connections with the Failed Node to Time Out.
> (This requires some sort of a message from the Surviving
> node back to an Initiator.) This is not quite what we have
> defined into iSCSI.

Since this is a TCP problem (get the connection to close),
iSCSI may not need to do anything ... what about failing over
the IP address and responding with ICMP Destination Unreachable
to anything that arrives on that failed-over IP address?
Implementations of this probably need to support multiple
IP addresses on a single network interface, which is not a
big deal.

--David
---------------------------------------------------
David L. Black, Senior Technologist
EMC Corporation, 42 South St., Hopkinton, MA  01748
+1 (508) 435-1000 x75140     FAX: +1 (508) 497-8500
black_david@emc.com       Mobile: +1 (978) 394-7754
---------------------------------------------------