Setting up iSCSI (target/server and initiator/client) on RHEL
It's quite easy to setup an iSCSI environment on Red Hat Enterprise Linux. Try this easy setup to get a better understanding of iSCSI.
Ingredients:
- Two (virtual) machines, a server 172.16.0.1 and a client 172.16.0.2.
- Access to the "RHEL Cluster-Storage" channel on Red Hat Network.
On the server execute these commands to setup a 100 Mb iSCSI target. This target can later be mounted on the client(s).
# yum install scsi-target-utils
# cat /etc/tgt/targets.conf
<target iqn.2010-04.nl.meinit:node1.target1>
backing-store /iscsi1.img
initiator-address 172.16.0.2
</target>
# dd if=/dev/zero of=/iscsi1.img bs=1024 count=102400
# chkconfig tgtd on
# service tgtd startNow on (all) client(s) follow these steps. (Please pay attention that only one client was give access in the configuration example above; 172.16.0.2.)
# yum install iscsi-initiator-utilsTo see what IQNs are available, run:
# iscsiadm -m discover -t sendtargets -p 172.16.0.1The result is a list of IQN(s) available. This discovery is a mandatory step of connecting to the iSCSI target.
Login to the iSCSI target:
# iscsiadm -m node -T iqn.2010-04.nl.meinit:node1.target1 -p 172.16.0.1 -lIf that all works, you have new SCSI devices available, check dmesg and start iscsi at boot time:
# chkconfig iscsi onIn this example the iSCSI target does not have a filesystem. Create it on the client and mount it at boot time:
# fdsik /dev/sda
# mkfs.ext3 /dev/sda1
# echo "/dev/sda1 /mnt ext3 defaults,_netdev 0 0" >> /etc/fstabYou are done, but these commands are quite useful when connecting to an unknown iSCSI device.
To see more about the IQN:
# iscsiadm -m node -T iqn.2010-04.nl.meinit:node1.target1 -p 172.16.0.1
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