Installation guide

Chapter 21. Online Storage Management

138

If your device supports multiple targets, you will need to issue a sendtargets command to the hosts

to find new portals for each target. Then, rescan existing sessions to discover new logical units on

existing sessions (i.e. using the --rescan option).

Important

The sendtargets command used to retrieve --targetname and --portal values overwrites

the contents of the /var/lib/iscsi/nodes database. This database will then be repopulated

using the settings in /etc/iscsi/iscsid.conf. However, this will not occur if a session is

currently logged in and in use.

To safely add new targets/portals or delete old ones, use the -o new or -o delete options,

respectively. For example, to add new targets/portals without overwriting /var/lib/iscsi/

nodes, use the following command:

iscsiadm -m discovery -t st -p target_IP -o new

To delete /var/lib/iscsi/nodes entries that the target did not display during discovery, use:

iscsiadm -m discovery -t st -p target_IP -o delete

You can also perform both tasks simultaneously, as in:

iscsiadm -m discovery -t st -p target_IP -o delete -o new

The sendtargets command will yield the following output:

ip:port,target_portal_group_tag proper_target_name

For example, given a device with a single target, logical unit, and portal, with equallogic-iscsi1

as your target_name, the output should appear similar to the following:

10.16.41.155:3260,0 iqn.2001-05.com.equallogic:6-8a0900-ac3fe0101-63aff113e344a4a2-dl585-03-1

Note that proper_target_name and ip:port,target_portal_group_tag are identical to the

values of the same name in Section 21.2.1, “iSCSI API”.

At this point, you now have the proper --targetname and --portal values needed to manually

scan for iSCSI devices. To do so, run the following command:

iscsiadm --mode node --targetname proper_target_name --portal

ip:port,target_portal_group_tag \ --login

This is a single command split into multiple lines, to accommodate printed and PDF versions of this document. All

concatenated lines — preceded by the backslash (\) — should be treated as one command, sans backslashes.