iSCSI treatment new target LUN in the additional paths for target Lun

Hello

I have a 5.5.0 ESXi host (build 1331820) I am trying place some new iSCSI LUNS to, but I have a problem with it that I am hoping someone can help me solve.

The back-end iSCSI server is running CentOS 6.5 with tgtd providing iSCSI targets.  There are four iSCSI targets in production, with another two created and used here.  When I re-scan the iSCSI environment after adding two new objectives, I see more than 4 disks in the Details pane of map iSCSI under Configuration-> storage adapters.

In addition, two of the LUNS stop working and inspection also shows that new iSCSI targets are seen as paths separate for the two broken LUNS.  It is:

Existing LUNS:

IQN.2014 - 06.storage0.jonheese.local:datastore0

IQN.2014 - 06.storage1.jonheese.local:datastore1

IQN.2014 - 06.storage2.jonheese.local:datastore2

IQN.2014 - 06.storage3.jonheese.local:datastore3

New LUN:

IQN.2014 - 06.storage4.jonheese.local:datastore4

IQN.2014 - 06.storage5.jonheese.local:datastore5

Of the "Managing paths" dialog for each found discs, I see that "datastore4" presents itself as an additional path to "datastore0" and "datastore5" presents itself as a path to "datastore1" - even if the target names are clearly different.

So can someone tell me why vSphere client iSCSI is the treatment target separate iSCSI LUNS as having multiple paths to the same target?  I compared the configuration of tgtd between the original LUN 4 and 2 new LUNS, and everything seems OK.  They are all attached to different backend disks (not that vSphere should know/care about this) and I wrote zeros to the new back-end disks LUNS to ensure that there is nothing odd about the disc, confusing the iSCSI client.

I can post some newspapers/config/information required.  Thanks in advance.

Kind regards

Jon Heese

For anyone who is on this same situation, my supposition above proved to be correct.  But in addition to renumbering of the scsi_id each of the LUNS, I also had to renumber the field controller_tid to the controllers on the second node would be present with unique IDS.  Here is an example of the stanza of config I used for each LUN:

# device LUN storage medium

-storage/dev/drbd5 store

# SCSI for storage LUN identifier

scsi_id EIT 00050001

# Identifier for the LUN controller SCSI

controller_tid 5

# iSCSI initiator IP address (ed) allowed to connect

initiator-address 192.168.24.0/24

It is a problem of configuration of tgtd after all!  Thanks to all for the questions that led me to the right answer!

Kind regards

Jon Heese

Tags: VMware

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