iscsi notes

Submitted by sandip on Mon, 10/15/2012 - 10:13

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

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/

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