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LUN value via iSCSI (server manager)


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I've been using iSCSI to backup some of my VMs and I have a question regarding the LUN values that can be applied via Server Manager.
I have a VM which uses 5 drives...  and I have setup 5 iSCSI targets for each.  I left the LUN settings as default (0) for them and am wondering if I should have configured them to use different LUNs for each (e.g.:  0-4, or 1,2,3..)
They are all mapped at the same time via my script, and after backups, they're suppose to be disconnected.  However, I've noticed sometimes that they are not disconnecting via my script and what may be a correlating event happening:
(note, this log is from the system mapping the target)

Log Name: System
Source: iScsiPrt
Date: 10/21/2016 7:24:23 PM
Event ID: 52
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: Centurion.LAB.local
Initiator Service failed to respond in time to a request to configure IPSec resources for an iSCSI connection.
Event Xml:
Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"
Provider Name="iScsiPrt" /
EventID Qualifiers="49152"52/EventID
TimeCreated SystemTime="2016-10-22T00:24:23.410211800Z" /
Security /



Is it possible that this is due to multiple targets being mapped with the same LUN id provided by the iSCSI target server?

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