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iscsi target

• Install iscsi utils:
  
  yum install scsi-target-utils
• Bring up tgtd:
  
  chkconfig tgtd on
service tgtd start
• Define an iscsi target name:
  
  # tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.2012-10.com.linuxweblog.srv01:lv1_iscsi0
• Delete specific iscsi target:
  
  # tgtadm --lld iscsi --op delete --mode target --tid 1
• Add a logical unit to the target:
  
  # tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/vg1/lv1_iscsi0
• Delete logical unit:
  
  # tgtadm --lld iscsi --op delete --mode logicalunit --tid 1 --lun 1
• Enable the target to accept any initiators:
  
  # tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL
• View configuration:
  
  # tgtadm --lld iscsi --op show --mode target
• Save the tgt conf:
  
  # tgt-admin --dump >/etc/tgt/targets.conf

iscsi initiator

• install the initiator client:
  
  # yum install iscsi-initiator-utils
• startup the iscsi daemon so all kernel modules get loaded:
  
  # chkconfig iscsid on
# chkconfig iscsi on
# service iscsid start
• Discover targets:
  
  # iscsiadm --mode discovery --type sendtargets --portal 192.168.1.11
• Login to target:
  
  # service iscsi restart
• To manually login:
  
  # iscsiadm --mode node --targetname iqn.2012-10.com.linuxweblog.srv01:lv1_iscsi0 --portal 192.168.1.11 --login
• To manually logout:
  
  # iscsiadm --mode node --targetname iqn.2012-10.com.linuxweblog.srv01:lv1_iscsi0 --portal 192.168.1.11 --logout
• To delete targets:
  
  # iscsiadm --mode node --targetname iqn.2012-10.com.linuxweblog.srv01:lv1_iscsi0 --portal 192.168.1.11 -o delete
• List sessions:
  
  # iscsiadm -m session
• List nodes:
  
  # iscsiadm -m node

References:

• http://www.cyberciti.biz/tips/howto-setup-linux-iscsi-target-sanwith-tgt.html
  
• http://www.cyberciti.biz/tips/rhel-centos-fedora-linux-iscsi-howto.html
  
• http://knowledgelayer.softlayer.com/questions/265/Can+I+connect+multiple+servers+to+a+single+iSCSI+LUN%3F
  
• http://prefetch.net/blog/index.php/2009/04/12/configuring-the-open-iscsi-initiator-on-centos-linux-hosts/