Bug 589988

Summary:	Add a configurable (or random) way of setting a WWN on targets
Product:	Red Hat Enterprise Linux 5	Reporter:	Dan Yasny <dyasny>
Component:	scsi-target-utils	Assignee:	Andy Grover <agrover>
Status:	CLOSED WONTFIX	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	high	Docs Contact:
Priority:	low
Version:	5.5	CC:	acathrow, jcapel, roland.friedwagner, tscherf
Target Milestone:	rc
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Hardware:	All
OS:	Linux
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Last Closed:	2012-09-27 23:37:49 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Dan Yasny 2010-05-07 13:08:28 UTC

Description of problem:
Currently the targets presented to the initiator as 1IET10001000. If I set up two hosts serving targets, and connect from the same initiator host, I get two identical WWNs, which creates confusion and renders the second host's tagets unusable for LVM setups. 

Version-Release number of selected component (if applicable):
scsi-target-utils-0.0-6.20091205snap.el5_5.2


How reproducible:
always

Steps to Reproduce:
1.install two rhel 5.5 hosts with scsi-target utils
2.create a target on both
3.connect to both from the same initiator host
  
Actual results:
multipath -ll shows:
1IET_00010001 dm-1 RHEV GSS,VIRTUAL-DISK
[size=100G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 2:0:0:1 sdb 8:16  [active][ready]

Trying to use the second target with pvcreate returns Can't initialize physical volume "/dev/mpath/1IET_00010001" of volume group "5a6800e6-5985-4db7-add1-db4cf7bc037a" without -ff 

Expected results:
WWN line to be configurable, or concatenated with a unique string to avoid confusion

Additional info:

Comment 1 Mike Christie 2011-02-02 10:17:43 UTC

Sorry, I did not see this until today.

You can do this by setting the scsi_sn or scsi_id params.

Example in targets.conf

<target iqn.2008-09.com.example:server.target5>
 <backing-store /dev/sdb1>
    scsi_sn somevalue
    scsi_id someothervalue