Removing a persistent iSCSI connection

Kill the iSCSI session

First, find the session you're trying to delete:

sudo iscsiadm -m session

The key information is also available from the iSCSI server itself (using the equallogic cluster as an example):

sudo iscsiadm -m discovery -t st -p 10.2.0.201

The iqn number is the key from the command output. To disconnect the session:

sudo iscsiadm -m node -T <iqn> -p 10.2.0.201 -u

This is only the first skirmish of the battle, however, as the iscsi subsystem is rather persistent about keeping its connections alive and restoring them after a reboot. To prevent the session from re-establishing, you may wish to remove the node:

sudo iscsiadm -m node -o delete -T <iqn>

Once this is complete, make sure the session is no longer listed:

sudo iscsiadm -m session

If required (it is extreme, but may be necessary), you can also delete the targets from the ISCSI discovery database entirely.

sudo iscsiadm -m discoverydb -t sendtargets -p 10.2.0.201 -o delete

Finally, clean out the state information to ensure Linux does not try to re-establish the connection on future boot operations.

ls /var/lib/iscsi/nodes/<iqn>

If the <iqn> exists, delete it:

sudo rm -rf /var/lib/iscsi/nodes/<iqn>

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Excerpted and adapted from https://support.unitrends.com/hc/en-us/articles/360013269518-Remove-ISCSI-sessions-using-the-Linux-command-line