iSCSI

Install iscsi package
```
$ yum install iscsi-initiator-utils
```
Query iscsi-initiator package installed or not
```
$ rpm -qa | grep -i iscsi
```
Query iscsi intiator name
```
$ cat /etc/iscsi/initiatorname.iscsi
```
This will return output like InitiatorName=iqn.1994-05.com.redhat:9f51e9794fa

Start the iscsi service

$ service iscsi start

or

$ /etc/init.d/iscsi start

Discover available targets from a discovery portal

$ iscsiadm -m discovery -t sendtargets -p ipaddress

Log into all targets
```
$ iscsiadm –m node –l
```
To see the connection status
```
$ iscsiadm -m session
```
Login individual target
```
$ iscsiadm -m node -l -T <iqn_of_target> -l -p <target_ip_address>:3260
```
e.g., iscsiadm -m node -l -T iqn.2001-05.com.equallogic:0-8a0906-centos-cluster -l -p 192.168.40.10:3260
Logging out all targets
```
$ iscsiadm –m node –u
```
Logging off an individual target
```
$ iscsiadm –m node –u –T <iqn_of_target> –p <target_ip_address>:3260
```
e.g., iscsiadm –m node –u –T iqn.2001-05.com.equallogic:0-8a0906-centos-cluster –p 192.168.40.10:3260
Delete session records
```
$ iscsiadm –o delete
```

Rescan lun

$ iscsiadm -m node -p <target_ip_address> --rescan

Get the WWN of the fiber card port(s) by showing the content of /sys/class/fc_host/hostX/port_name
```
$ cat /sys/class/fc_host/hostX/port_name
```

Rescan iscsi devices

$ for i in `ls -U /sys/class/scsi_host/`; do  echo "- - -" > /sys/class/scsi_host/$i/scan ;  done

Rescan FC devices

$ for i in `ls -U /sys/class/fc_host/`; do echo 1 > /sys/class/fc_host/host$i/issue_lip; done

View iSCSI database regarding discovery
```
$ iscsiadm -m discovery -o show
```
View iSCSI database regarding targets to log into
```
$ iscsiadm -m node -o show
```
View iSCSI database regarding sessions logged into
```
$ iscsiadm -m session -o show
```

Provide feedback