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scsi Target in rhel 6

Define an iscsi target name

The following example creates a target with id 1 (the iqn is 19 iqn.2001-04.com.example:storage.disk2.amiens.sys1.xyz) and adds a 20 logical unit (backed by /dev/hdc1) with lun 1.
# tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.2001-04.com.example:storage.disk2.amiens.sys1.xyz

To view the current configuration, enter:
# tgtadm --lld iscsi --op show --mode target
Sample output:

Target 1: iqn.2001-04.com.example:storage.disk1.amiens.sys1.xyz     System information:         Driver: iscsi         Status: running     I_T nexus information:     LUN information:         LUN: 0             Type: controller             SCSI ID: deadbeaf1:0             SCSI SN: beaf10             Size: 0             Online: No             Poweron/Reset: Yes             Removable media: No             Backing store: No backing store     Account information:     ACL information:

Add a logical unit to the target (/dev/sdb1):
# tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/sdb1

A note about home computer / test system

Most production boxes will only use iSCSI root with real iSCSI devices, but for testing purposes it can be quite useful to set up an iSCSI target on your image server. This is useful for testing and learning iSCSI target and iSCSI initiator at home, simply use filesystem for testing purpose. Use dd command to create diskbased filesystem:
# dd if=/dev/zero of=/fs.iscsi.disk bs=1M count=512
Add /fs.iscsi.disk as a logical unit to the target:
# tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /fs.iscsi.disk
Now, you should able to view details:
# tgtadm --lld iscsi --op show --mode target
Sample output:

Target 1: iqn.2001-04.com.example:storage.disk1.amiens.sys1.xyz     System information:         Driver: iscsi         Status: running     I_T nexus information:     LUN information:         LUN: 0             Type: controller             SCSI ID: deadbeaf1:0             SCSI SN: beaf10             Size: 0             Online: No             Poweron/Reset: Yes             Removable media: No             Backing store: No backing store         LUN: 1             Type: disk             SCSI ID: deadbeaf1:1             SCSI SN: beaf11             Size: 512M             Online: Yes             Poweron/Reset: Yes             Removable media: No             Backing store: /fs.iscsi.disk     Account information:     ACL information:

Accept iSCSI Target

To enable the target to accept any initiators, enter:
# tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL
This should open network port # 3260:
# netstat -tulpn | grep 3260
Sample output:

tcp        0      0 0.0.0.0:3260            0.0.0.0:*               LISTEN      27328/tgtd tcp6       0      0 :::3260                 :::*                    LISTEN      27328/tgtd

And you are done. Your system is configured as iSCSI Target. Remote client computer can access this computers hard disk over network. Your can use cluster aware filesystem to setup real shared storage for small business. Open TCP port 3260 in your firewall, if required.

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