How to delete an iscsi-target from openfiler and Linux

How to delete an iscsi-target from openfiler and Linux

In my last article I had shown you steps to create iscsi-target using openfiler. So in this article I will be showing you step by step method to delete an iscsi-target from openfiler.

This is my GUI console of openfiler where I want to delete the target marked in  red .

How to delete an iscsi-target from openfiler and Linux

Now you won't be able to delete the target from the GUI, so login to the CLI of the server using putty or directly via the console of the server.

Login using the root account and follow the below steps

# cd /opt/openfiler/etc/iscsi

# ls -l

total 28
-rw-r--r-- 1 openfiler openfiler 2000 Jul 28 19:52 ietd.conf.tmp
drwxr-xr-x 2 root      root      4096 Jul 28 19:41 iqn.2006-01.com.openfiler:ctdb
drwxr-xr-x 2 root      root      4096 Jul 28 19:41 iqn.2006-01.com.openfiler:qdisk
drwxr-xr-x 2 root      root      4096 Jul 28 19:40 iqn.2006-01.com.openfiler:san
drwxr-xr-x 2 root      root      4096 Jul 28 19:52 iqn.2006-01.com.openfiler:tsn.dc0b0f3d8f75
drwxr-xr-x 2 root      root      4096 Jul 28 19:43 targets
drwxr-xr-x 2 root      root      4096 Apr 12  2011 transforms

As you can see all the iscsi-targets created are visible. Go ahead and remove the target which you do not require any more

# rm -rf "iqn.2006-01.com.openfiler:tsn.dc0b0f3d8f75"

Now change directory into targets

# cd targets/

# pwd
/opt/openfiler/etc/iscsi/targets

Open the iscsi_settings.xml file and remove the iscsi-target entry as shown below in

# vi iscsi_settings.xml
<?xml version="1.0"?>
<iet>
  <globalsettings>
    <isns/>
  </globalsettings>
  <targets>
    <target Name="iqn.2006-01.com.openfiler:san">
      <HeaderDigest value="None"/>
      <DataDigest value="None"/>
      <MaxConnections value="1"/>
      <InitialR2T value="Yes"/>
      <ImmediateData value="No"/>
      <MaxRecvDataSegmentLength value="131072"/>
      <MaxXmitDataSegmentLength value="131072"/>
      <MaxBurstLength value="262144"/>
      <FirstBurstLength value="262144"/>
      <DefaultTime2Wait value="2"/>
      <DefaultTime2Retain value="20"/>
      <MaxOutstandingR2T value="8"/>
      <DataPDUInOrder value="Yes"/>
      <DataSequenceInOrder value="Yes"/>
      <ErrorRecoveryLevel value="0"/>
      <Wthreads value="16"/>
      <QueuedCommands value="32"/>
      <lun Id="0" Path="/dev/san/work" Type="blockio" ScsiId="hgrEcw-zeTg-cXpE" ScsiSN="hgrEcw-zeTg-cXpE" IOMode="t"/>
    </target>
    <target Name="iqn.2006-01.com.openfiler:ctdb">
      <HeaderDigest value="None"/>
      <DataDigest value="None"/>
      <MaxConnections value="1"/>
      <InitialR2T value="Yes"/>
      <ImmediateData value="No"/>
      <MaxRecvDataSegmentLength value="131072"/>
      <MaxXmitDataSegmentLength value="131072"/>
      <MaxBurstLength value="262144"/>
      <FirstBurstLength value="262144"/>
      <DefaultTime2Wait value="2"/>
      <DefaultTime2Retain value="20"/>
      <MaxOutstandingR2T value="8"/>
      <DataPDUInOrder value="Yes"/>
      <DataSequenceInOrder value="Yes"/>
      <ErrorRecoveryLevel value="0"/>
      <Wthreads value="16"/>
      <QueuedCommands value="32"/>
      <lun Id="0" Path="/dev/san/ctdb" Type="blockio" ScsiId="zegB7p-3BHl-ySne" ScsiSN="zegB7p-3BHl-ySne" IOMode="t"/>
    </target>
    <target Name="iqn.2006-01.com.openfiler:qdisk">
      <HeaderDigest value="None"/>
      <DataDigest value="None"/>
      <MaxConnections value="1"/>
      <InitialR2T value="Yes"/>
      <ImmediateData value="No"/>
      <MaxRecvDataSegmentLength value="131072"/>
      <MaxXmitDataSegmentLength value="131072"/>
      <MaxBurstLength value="262144"/>
      <FirstBurstLength value="262144"/>
      <DefaultTime2Wait value="2"/>
      <DefaultTime2Retain value="20"/>
      <MaxOutstandingR2T value="8"/>
      <DataPDUInOrder value="Yes"/>
      <DataSequenceInOrder value="Yes"/>
      <ErrorRecoveryLevel value="0"/>
      <Wthreads value="16"/>
      <QueuedCommands value="32"/>
      <lun Id="0" Path="/dev/san/qdisk" Type="blockio" ScsiId="VWq9z7-aa2l-6RMj" ScsiSN="VWq9z7-aa2l-6RMj" IOMode="wt"/>
    </target>
    <target Name="iqn.2006-01.com.openfiler:tsn.dc0b0f3d8f75">
      <HeaderDigest value="None"/>
      <DataDigest value="None"/>
      <MaxConnections value="1"/>
      <InitialR2T value="Yes"/>
      <ImmediateData value="No"/>
      <MaxRecvDataSegmentLength value="131072"/>
      <MaxXmitDataSegmentLength value="131072"/>
      <MaxBurstLength value="262144"/>
      <FirstBurstLength value="262144"/>
      <DefaultTime2Wait value="2"/>
      <DefaultTime2Retain value="20"/>
      <MaxOutstandingR2T value="8"/>
      <DataPDUInOrder value="Yes"/>
      <DataSequenceInOrder value="Yes"/>
      <ErrorRecoveryLevel value="0"/>
      <Wthreads value="16"/>
      <QueuedCommands value="32"/>
      <lun Id="0" Path="/dev/san/ctdb" Type="blockio" ScsiId="zegB7p-3BHl-ySne" ScsiSN="zegB7p-3BHl-ySne" IOMode="wt"/>
    </target>
  </targets>
</iet>

Once done save and exit the file and restart the iscsi-target services

# /etc/init.d/iscsi-target restart
Stopping iSCSI target service: ......                      [  OK  ]
Starting iSCSI target service:                             [  OK  ]

Verify the changes as you can see the target is successfully deleted.

How to delete an iscsi-target from openfiler and Linux

Once the iscsi-target is removed from the openfiler you might get the below error on your client linux machine while attempting to restart the iscsi services

# service iscsi restart
Stopping iscsi:                                            [  OK  ]
Starting iscsi: iscsiadm: Could not login to [iface: default, target: iqn.2006-01.com.openfiler:tsn.dc0b0f3d8f75, portal: 192.168.1.8,3260].
iscsiadm: initiator reported error (19 - encountered non-retryable iSCSI login failure)
iscsiadm: Could not log into all portals

To remove iscsi target from linux machine

# service iscsi stop
Stopping iscsi:                                            [  OK  ]

Delete the selected target using the below command

# iscsiadm -m node -o delete -T "iqn.2006-01.com.openfiler:tsn.dc0b0f3d8f75" --portal 192.168.1.8,3260

Re-discover the iscsi target from the openfiler server and as you see below we only have the required targets

# iscsiadm -m discovery -t sendtargets -p 192.168.1.8
192.168.1.8:3260,1 iqn.2006-01.com.openfiler:qdisk
192.168.1.8:3260,1 iqn.2006-01.com.openfiler:ctdb
192.168.1.8:3260,1 iqn.2006-01.com.openfiler:san

Start the required iscsi services on the linux box

# service iscsi start
Starting iscsi:                                            [  OK  ]

I hope I made my self clear.

 

Related Articles
Configuring iSCSI storage using openfiler
How to install openfiler
How to configure iscsi target using Red Hat Linux

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