[stgt] LUN missing after target server crash

[Patrick H.]

I've been playing with stgt in a cluster of VMs and have run across one
issue. Whenever the target is mounted on a client and I kill the VM
running tgtd, when the box comes back up the LUN is missing. The target
is still there, just the LUN is gone. If I re-add it everything works
fine, but I would like to know why I have to do this.
Additionally the target server has 2 targets, and both of them are in
active sessions on a client, but its only the target that is actually
mounted at the time that is missing after reboot.

Before simulated crash
---------------------------
Target 1: iqn.165.212.101.240:nas03.sdb1
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
        I_T nexus: 2
            Initiator: iqn.1994-05.com.redhat:fce94bd7cd86
            Connection: 0
                IP Address: 165.212.101.241
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: None
        LUN: 1
            Type: disk
            SCSI ID: IET     00010001
            SCSI SN: beaf11
            Size: 268 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: /dev/sdb1
    Account information:
    ACL information:
        ALL
Target 2: iqn.165.212.101.240:nas03.sdb2
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
        I_T nexus: 1
            Initiator: iqn.1994-05.com.redhat:fce94bd7cd86
            Connection: 0
                IP Address: 165.212.101.241
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00020000
            SCSI SN: beaf20
            Size: 0 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: None
        LUN: 1
            Type: disk
            SCSI ID: IET     00020001
            SCSI SN: beaf21
            Size: 268 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: /dev/sdb2
    Account information:
    ACL information:
        ALL


After the box comes back up
----------------------------------
Target 1: iqn.165.212.101.240:nas03.sdb1
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
        I_T nexus: 1
            Initiator: iqn.1994-05.com.redhat:fce94bd7cd86
            Connection: 0
                IP Address: 165.212.101.241
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00010000
            SCSI SN: beaf10
            Size: 0 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: None
    Account information:
    ACL information:
        ALL
Target 2: iqn.165.212.101.240:nas03.sdb2
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
        I_T nexus: 2
            Initiator: iqn.1994-05.com.redhat:fce94bd7cd86
            Connection: 0
                IP Address: 165.212.101.241
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET     00020000
            SCSI SN: beaf20
            Size: 0 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: None
        LUN: 1
            Type: disk
            SCSI ID: IET     00020001
            SCSI SN: beaf21
            Size: 268 MB
            Online: Yes
            Removable media: No
            Backing store type: rdwr
            Backing store path: /dev/sdb2
    Account information:
    ACL information:
        ALL
-------------------

Notice that Target 1 - LUN 1 is gone
`tgtadm --mode logicalunit --op new --tid 1 --lun 1 -b /dev/sdb1` will
add it back and it works fine


My targets.conf
--------------------
default-driver iscsi
iSNSServerIP 165.212.101.243
<target iqn.165.212.101.240:nas03.sdb2>
        backing-store /dev/sdb2
</target>
<target iqn.165.212.101.240:nas03.sdb1>
        backing-store /dev/sdb1
</target>
--------------------

Running:
rhel6 2.6.32-71
scsi-target-utils 1.0.4-3



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