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Running an iSCSI SAN on CentOS 5July 14th, 2008 Remco Bressers
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Running iSCSI target on a Fedora system is as easy as yum
install iscsitarget and configure thething. Unfortunatly, on
CentOS, the iSCSI Enterprise Target (IET) daemon is not in the
defaultYum repositories, because CentOS usually uses TGT ( Linux
SCSI Target Framework ).Ok, i could dive into using TGT on a CentOS
box, but thats not what i wanted to use on acorporate SAN. So, lets
find it out the hard way and build from source.
The iSCSI Target system
First, some prerequisites :
# yum install kernel-devel openssl-devel gcc rpm-build
Download the latest IET from the Sourceforge repo and put the
tgz in /usr/src
# cd /usr/src# tar xvf iscsitarget-0.4.15.tar.gz# cd
iscsitarget-0.4.15# make# make install
Alright. IETD is installed and ready to use. The iscsi-target
init.d script is installed and will bestarted at boot-time. Nice!
One bad thing is, that every time you install a new kernel, you
need torecompile ietd . Write this down on your forehead or
somewhere you will look at every single day
Configuring ietd is a piece of cake if the documentation would
be easy findable, but it isnt (orwasnt).First, lets decide who can
connect to the IET daemon :
# vi /etc/initiators.allow
iqn.2008-07.my-sanhead:mydiskname 192.168.1.0/24
Yep, quite a strange string. Its called an IQN (iscsi qualified
name) and i use this namingconvention:iqn.-.:The IQN is an
identifier for your iSCSI target. A target can consist of multiple
disks and/or luns.The iSCSI initiator uses the IQN to connect to
these disks/luns. The subnet 192.168.1.0/24 isallowed to use this
iSCSI target.
Next, well create the initiators.deny file, which is pretty
straightforward :# vi /etc/initiators.deny
ALL:ALL
Time to create the IQN in the ietd configuration file.
# vi /etc/ietd.conf
Target iqn.2008-07.my-sanhead:mydisknameIncomingUser username
12345OutgoingUser username 123456789012Lun 0
Path=/dev/SAN/diskname,Type=fileio,IOMode=wbAlias iSCSI for
disknameImmediateData Yes
http://remcobressers.nl/author/admin/http://remcobressers.nl/2008/07/running-iscsi-san-centos-5/#respondhttp://remcobressers.nl/2008/07/running-iscsi-san-centos-5/#commentshttp://remcobressers.nl/2008/07/running-iscsi-san-centos-5/#commentshttp://iscsitarget.sourceforge.net/http://iscsitarget.sourceforge.net/http://stgt.berlios.de/http://iscsitarget.sourceforge.net/http://iscsitarget.sourceforge.net/http://remcobressers.nl/2008/07/running-iscsi-san-centos-5/#respondhttp://remcobressers.nl/2008/07/running-iscsi-san-centos-5/#commentshttp://iscsitarget.sourceforge.net/http://stgt.berlios.de/http://iscsitarget.sourceforge.net/http://remcobressers.nl/author/admin/
