9.6.1 Delete iSCSI devices

This section describes the procedure to delete the iSCSI devices used for the mirroring among servers.

Perform this procedure after deleting iSCSI devices to be deleted from a class of GDS and the resource database of PRIMECLUSTER.

For details, refer to the steps "Change the device names set in resources of the shared disk device" and "Delete resources of the shared disk device" in the procedure "Deleting a shared disk device" described in "PRIMECLUSTER Installation and Administration Guide."

Confirm LUN to be deleted on any node.

# iscsiadm -m session -P 3

[Execution example]

# iscsiadm -m session -P 3
iSCSI Transport Class version xxxxxxxx
version xxxxxxxx
Target: target-0201
    Current Portal: 192.168.56.10:3260,1
    Persistent Portal: 192.168.56.10:3260,1
        **********
        Interface:
        **********
...
        iSCSI Connection State: LOGGED IN
        iSCSI Session State: LOGGED_IN
        Internal iscsid Session State: NO CHANGE
...
        ************************
        Attached SCSI devices:
        ************************
        Host Number: 12 State: running
        scsi12 Channel 00 Id 0 Lun: 0
        scsi12 Channel 00 Id 0 Lun: 1
            Attached scsi disk sdd State: running
...
Target: target-0101                                         (*1)
    Current Portal: 192.168.56.20:3260,1
    Persistent Portal: 192.168.56.20:3260,1
        **********
        Interface:
        **********
...
        iSCSI Connection State: LOGGED IN
        iSCSI Session State: LOGGED_IN
        Internal iscsid Session State: NO CHANGE
...
        ************************
        Attached SCSI devices:
        ************************
        Host Number: 13 State: running
        scsi13 Channel 00 Id 0 Lun: 0
        scsi13 Channel 00 Id 0 Lun: 1                        (*2)
            Attached scsi disk sde State: running            (*3)
...

In the example, when deleting sde of (*3), LUN1 of (*2) is deleted in the target name "target-0101" of (*1).

Modify the /etc/tgt/targets.conf file on a node where the setting of LUN is to be deleted.

Delete the setting of LUN that the LUN number is 1.

[Example before changing]

<target target-0101>
  initiator-address 192.168.56.20
  initiator-address 192.168.56.10
  write-cache off
  <backing-store /dev/disk/by-id/scsi-3500000e114784363>
    lun 1
    scsi_id SDX01
  </backing-store>
  <backing-store /dev/disk/by-id/scsi-3500000e111c56611>
    lun 2
    scsi_id SDX02
  </backing-store>
</target>

[Example after changing]

<target target-0101>
  initiator-address 192.168.56.20
  initiator-address 192.168.56.10
  write-cache off
  <backing-store /dev/disk/by-id/scsi-3500000e111c56611>
    lun 2
    scsi_id SDX02
  </backing-store>
</target>

Stop iSCSI devices to be deleted on both node.

# echo offline > /sys/block/iSCSI_device_name/device/state

[Execution example]

# echo offline > /sys/block/sde/device/state

Delete iSCSI devices to be deleted on both nodes.

# echo 1 > /sys/block/iSCSI_device_name/device/delete

[Execution example]

# echo 1 > /sys/block/sde/device/delete

Confirm the target ID on a node where the setting of LUN is to be deleted.
The following shows that the target ID of the target name "target-0101" is 1.
```
# tgt-admin --show
Target 1: target-0101
...
```
Delete LUN on a node where the setting of LUN is to be deleted.
```
# tgtadm --lld iscsi --op delete --mode logicalunit --tid targetID --lun LUN
```
Point
- Specify the target ID to targetID.
- Specify the LUN number to LUN.
[Execution example]
```
# tgtadm --lld iscsi --op delete --mode logicalunit --tid 1 --lun 1
```

Confirm that LUN was deleted on a node where the setting of LUN was deleted.

# tgt-admin --show

Point

Confirm that LUN information of the deleted number was not output.

[Execution example]

# tgt-admin --show
...
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: IET 00010000
            SCSI SN: beaf10
            Size: 0 MB, Block size: 1
            Online: Yes
            Removable media: No
            Prevent removal: No
            Readonly: No
            Backing store type: null
            Backing store path: None
            Backing store flags:
...