iSCSI quickstart: target

1: Installation

Install scsi-target-utils package

# yum install scsi-target-utils

Open firewall port 3260. SELinux?

Start tgtd daemon

# /etc/init.d/tgtd start

# service tgtd start?
# chkconfig tgtd on?

2: Create target device

Define an iscsi target name/Create a new target device

# tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.2001-04.com.example:storage.disk2.amiens.sys1.xyz
# tgtadm --lld iscsi --op new --mode target --tid=1 --targetname iqn.2009-02.com.example:for.all
# tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.2009-05.com.jarvisstreet:storage.disk1

To view the current configuration, enter:

tgtadm --lld iscsi --op show --mode target

Sample output:

Target 1: iqn.2009-05.com.jarvisstreet:storage.disk1
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: deadbeaf1:0
            SCSI SN: beaf10
            Size: 0 MB
            Online: Yes
            Removable media: No
            Backing store: No backing store
    Account information:
    ACL information:

3: Add logical unit

Add a logical unit .Repeat this process while changing the -b parameter to add more logical units.

# tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/sda3

# tgtadm --lld iscsi --op show --mode target

Target 1: iqn.2009-05.com.jarvisstreet:storage.disk1
    System information:
        Driver: iscsi
        State: ready
    I_T nexus information:
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: deadbeaf1:0
            SCSI SN: beaf10
            Size: 0 MB
            Online: Yes
            Removable media: No
            Backing store: No backing store
        LUN: 1
            Type: disk
            SCSI ID: deadbeaf1:1
            SCSI SN: beaf11
            Size: 100011 MB
            Online: Yes
            Removable media: No
            Backing store: /dev/sda3
    Account information:
    ACL information:

4: Accept initiators

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

tgt-setup-lun utility

tgt-setup-lun(8)                                              tgt-setup-lun(8)

NAME
       tgt-setup-lun  -  creates  a  target,  adds  a device to the target and
       defines initiators that can connect to the target

SYNOPSIS
       tgt-setup-lun -d device  -n  target_name  [initiator_IP1  initiator_IP2
       ...] [-h]

DESCRIPTION
       Starts tgtd if necessary and creates a target according to the supplied
       target_name. The format of the target name is as follows:
       iqn.2001-04.com.hostname-target_name  The  target  name   must   be
       unique.

       The script then adds the requested device to the target. If specific IP
       addresses are defined, it adds them to the list of  allowed  initiators
       for  that  target.  If  no IP addresses is defined, it defines that the
       target accepts any initiator.

EXAMPLES
       Create a target that uses /dev/sdb1 and allows  connections  only  from
       192.168.10.81:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81

       Create  a  target  that uses /dev/sdb1 and allows connections only from
       192.168.10.81 and 192.168.10.82:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81 192.168.10.82

       Create a target that uses /dev/sdb1 and  allows  connections  from  any
       initiator:
       tgt-setup-lun -d /dev/sdb1 -n my_target

       Display help:
       tgt-setup-lun -h

mjhall