A session is a TCP connection between an initiator node port and a target node port.LUNs are not accessible until a session is established. After targets have been discovered by the initiator, the initiator needs to log in to access the LUNs. Logging in establishes a session, which is a TCP connection between an initiator node port and a target node port. Before logging in, no sessions are active. Example:
# iscsiadm -m session
iscsiadm: No active sessions
Use the following command to log in and establish a session. When a session is established, iSCSI control, data, and status messages are communicated over the session.
# iscsiadm -m node -l
To log in to a specific target:
# iscsiadm -m node –targetname iqn.2003-01.org.linux-iscsi.host02.x8664:sn.3abca38b994f –p 192.0.2.102:3260 -l
Login to [iface: default, target: iqn.2003-01.org.linux-iscsi.host02.x8664:sn.3abca38b994f, portal: 192.0.2.102:3260] successful.
To log off from all targets:
# iscsiadm -m node -u
To log off from a specific target, use the same login command as shown, except use –u.
Running the -m session command after logging in shows an active session:
# iscsiadm -m session
tcp: [1] 192.0.2.102:3260,1 iqn.2003-01.org.linux-iscsi.host02.x8664:sn.3abca38b994f (non-flash)
The TCP session includes a session ID (SID) of 1 in this example. Include –P <printlevel> for more details. Valid <printlevel> values are 1, 2, and 3.
The following example shows additional details on the session:
# iscsiadm -m session –P 1
Target: iqn.2003-01.org.linux-iscsi.host02.x8664:sn.3abca38b994f
Current Portal: 192.168.1.102:3260,1
Persistent Portal: 192.168.1.102:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.2003-01.org.linux-iscsi.host02.x8664:sn.3abca38b994f:host03
Iface IPaddress: 192.168.1.103
Iface HWaddress: <empty>
Iface Netdev: <empty>
SID: 1
iSCSI Connection State: LOGGED IN
iSCSI Session State: LOGGED IN
Internal iscsid Session State: NO CHANGE
The following example provides the most details, including information about the attached SCSI devices. In this example, the target defines two LUNs:
# iscsiadm -m session –P 3
Target: iqn.2003-01.org.linux-iscsi.host02.x8664:sn.3abca38b994f
…
************************
Attached SCSI devices:
************************
Host Number: 4 State: running
scsi10 Channel 00 Id 0 Lun:1
Attached scsi disk sda State: running
scsi10 Channel 00 Id 0 Lun:2
Attached scsi disk sdb State: running
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