Iscsi

iSCSI is a protocol that allows you to connect to block-oriented storage over the IP-network. To have an ISCSI target, you do not need to buy an enterprise-class ISCSI storage, you can start an ISCSI target as service on your computer. This is especially useful when running e.g. cluster tests on shared storage.

= QuickStart =

SUSE Linux Enterprise server 10
In this chapter, we will set up an ISCSI target and connect to it

Check your state
See how many block devices you have attached: hwinfo --block --short

Set up a target

 * start yast2
 * chose Miscellaneous->iSCSI target
 * continue as instructed, if prompted, allow to install the package iscsitarget

Set up an initiator

 * start yast2
 * chose Miscellaneous->iSCSI initiator
 * continue as instructed, if prompted, allow to install the package openiscsi

Check if it worked
See how many block devices you have attached: hwinfo --block --short It must be more than before

generic
In this chapter we will set up an iscsi target and test it by installing an iscsi initiator.

Set up a target
tar xvfz iscsitarget-0.4.15.tar.gz cd iscsitarget-0.4.15 make && make install on problems see the article Compiling. /etc/ietd.conf Target iqn.2007-12.local.net:storage.lvm Lun 0 Path=/dev/hdb /etc/init.d/iscsi-target start $ lsof -i [...] ietd     8692   root    7u  IPv6  36856       TCP *:iscsi-target (LISTEN) ietd     8692   root    8u  IPv4  36857       TCP *:iscsi-target (LISTEN)
 * Download the latest version of iscsi-target from http://iscsitarget.sourceforge.net/. In this example, we use version 0.4.15.
 * Unpack the package you just downloaded
 * Build the software
 * create a configuration for your service:
 * start the service
 * verify the service is running

Set up an initiator
To set up an iscsi initiator, install the openiscsi package. Then, discover your targets. Let's assume the IP-address of your target is 192.168.0.5

$ iscsiadm -m discovery -t st -p 192.168.0.5 [fa084c] 192.168.0.5:3260,1 iqn.2001-04.com.example:storage.disk2.sys1.xyz [3727f9] 127.0.0.1:3260,1 iqn.2001-04.com.example:storage.disk2.sys1.xyz $ iscsiadm -m node [fa084c] 192.168.0.5:3260,1 iqn.2001-04.com.example:storage.disk2.sys1.xyz [3727f9] 127.0.0.1:3260,1 iqn.2001-04.com.example:storage.disk2.sys1.xyz

You know now you have a target named iqn.2001-04.com.example:storage.disk2.sys1.xyz Now have a look what drives you have attached: $ hwinfo --block --short disk: /dev/sda            VMware Virtual S   /dev/sdb             IET VIRTUAL-DISK partition: [...] Now connect your iscsi target: $ iscsiadm -m node -T iqn.2001-04.com.example:storage.disk2.sys1.xyz -p 192.168.0.5:3260 --login And find a new device in your list: $ hwinfo --block --short disk: /dev/sda            VMware Virtual S   /dev/sdb             IET VIRTUAL-DISK /dev/sdc            IET VIRTUAL-DISK partition: [...]

= See also =


 * http://en.wikipedia.org/wiki/Iscsi
 * http://fedoranews.org/mediawiki/index.php/Going_Enterprise_-_setup_your_FC4_iSCSI_target_in_5_minutes
 * http://www.howtoforge.com/iscsi_on_linux