Adding New ISCSI LUN to Target, How does client iSCSI initiator access new Lun

[Rahsaan Page]

Hello All,

I have a question, when you add a new lun to iscsi target, if client
iSCSI initiator is already logged in to target, do i have to restart
the client iSCSI initiator for it to see the new lun? how can i make
client iSCSI initiator see new lun with out restarting iSCSI initiator
and losing connection to current Target and Lun's?

Thanks
--Rahsaan

[Mike Christie]

If you use a target that sends the iscsi async pdu with
REPORT_LUNS_DATA_CHANGED then the new luns should be added automatically
for you (deleted luns are not removed though and need to be manually
deleted).

If it is not getting automatically added then you need to run either

//rescan all sessions for new luns
iscsiadm -m session --rescan
// rescan specific session
iscsiadm -m session -R $SID --rescan
(see the README for other variants)

This commands only add new luns. If you want something that adds and
deletes luns then use the rescan-bus.sh script in the sg utils.

[Rahsaan Page]

Thank You Mike,

This is very appreciated....

Sent from my HTC on the Now Network from Sprint!

[govind....@gmail.com]

thx, it helped me to find the discovered lun

[caqu...@gmail.com]

Mike,

This help me to discover the new LUNs, I have one question, I am running a cluster services, I did the rescan from the standby node, I need to run it also on the active nodes, but first I want to know if running the rescan will affect the mounted LUNs and/or the active cluster services?

Thanks,

[Michael Christie]

The iscsiadm rescan command will not disrupt mounted LUNs. All it does it discovery new LUNs.

If you did something like remap LUNs then you would have other issues. iscsiadm rescan does not handle that.

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