How To Configure Iscsi Storage On Redhat Linux

Show current installed redhat version and update

[root@CSSW2013NOC3 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.7 (Tikanga)

Display Architecture

[root@CSSW2013NOC3 ~]# getconf LONG_BIT
64

Check isci initiator installed or not (You need iscsi-initiator-utils-6.2.0.742-0.6.el5 or greater)

[root@CSSW2013NOC3 ~]# rpm -qa | grep -i iscsi
iscsi-initiator-utils-6.2.0.872-10.el5

Display interfaces and IP address details

[root@CSSW2013NOC3 ~]# ifconfig -a | more

eth0 Link encap:Ethernet HWaddr 00:50:56:AB:00:E7
inet addr:172.28.*.* Bcast:172.28.12.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2503 errors:0 dropped:0 overruns:0 frame:0
TX packets:838 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:196784 (192.1 KiB) TX bytes:98212 (95.9 KiB)
eth1 Link encap:Ethernet HWaddr 00:50:56:AB:00:E8
inet addr:172.28.*.* Bcast:172.28.40.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4237 errors:0 dropped:0 overruns:0 frame:0
TX packets:3807 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:966177 (943.5 KiB) TX bytes:359247 (350.8 KiB)
eth2 Link encap:Ethernet HWaddr 00:50:56:AB:01:00
inet addr:172.28.*.* Bcast:172.28.40.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4387 errors:0 dropped:0 overruns:0 frame:0
TX packets:3960 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:894415 (873.4 KiB) TX bytes:384013 (375.0 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:10 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:660 (660.0 b) TX bytes:660 (660.0 b)

Creating the interface files for MPIO

[root@CSSW2013NOC3 ~]# iscsiadm -m iface -I eth1 -o new
New interface eth1 added
[root@CSSW2013NOC3 ~]# iscsiadm -m iface -I eth2 -o new
New interface eth2 added

Updating the interface name for each port

[root@CSSW2013NOC3 x ~]# iscsiadm -m iface -I eth1 -o update -n iface.net_ifacename -v eth1
eth1 updated.
[root@CSSW2013NOC3 ~]# iscsiadm -m iface -I eth2 -o update -n iface.net_ifacename -v eth2
eth2 updated.
[root@CSSW2013NOC3 ~]# cat /var/lib/iscsi/ifaces/eth1
# BEGIN RECORD 2.0-872
iface.iscsi_ifacename = eth1
iface.net_ifacename = eth1
iface.transport_name = tcp
# END RECORD
[root@CSSW2013NOC3 ~]# cat /var/lib/iscsi/ifaces/eth2
# BEGIN RECORD 2.0-872
iface.iscsi_ifacename = eth2
iface.net_ifacename = eth2
iface.transport_name = tcp
# END RECORD

Iscsi target Discovering using iscsiadm command

[root@CSSW2013NOC3 ~]# iscsiadm -m discovery -t st -p 172.28.*.*:3260
172.28.*.*:3260,1 iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel
172.28.*.*:3260,1 iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel

Logging into target ( You have option to login individually also)

[root@CSSW2013NOC3 ~]# iscsiadm -m node -l
Logging in to [iface: eth2, target: iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel, portal: 172.28.*.*,3260]
Logging in to [iface: default, target: iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel, portal: 172.28.*.*,3260]
Logging in to [iface: eth1, target: iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel, portal: 172.28.*.*,3260]
Login to [iface: eth2, target: iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel, portal: 172.28.*.*,3260] successful.
Login to [iface: default, target: iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel, portal: 172.28.*.*,3260] successful.
Login to [iface: eth1, target: iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel, portal: 172.28.*.*,3260] successful.

Display scsi attached device

[root@CSSW2013NOC3 ~]# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: VMware Model: Virtual disk Rev: 1.0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi7 Channel: 00 Id: 00 Lun: 00
Vendor: EQLOGIC Model: 100E-00 Rev: 5.2
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi6 Channel: 00 Id: 00 Lun: 00
Vendor: EQLOGIC Model: 100E-00 Rev: 5.2
Type: Direct-Access ANSI SCSI revision: 05

Below command will display Iscsi session details

[root@CSSW2013NOC3 ~]# iscsiadm -m session
tcp: [6] 172.28.*.*:3260,1 iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel
tcp: [7] 172.28.*.*:3260,1 iqn.2001-05.com.equallogic:0-8a0906-a146b2a07-57858e634784f7b0-bobrhel