Vvc: /* Setup initiator */

2010-06-06T15:13:25Z

Setup initiator

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=iSCSI setup=
__NOTITLE__
== Setup a target ==

* install packages
yum install scsi-target-utils

* add targets and allowed hosts to the config file '''/etc/tgt/targets.conf'''
<pre>
default-driver iscsi
<target iqn.2010-05.lan.chepkov:centos>
backing-store /dev/centos/target1
backing-store /dev/centos/target2
vendor_id VVC
initiator-address 10.10.10.19
initiator-address 10.10.10.20
initiator-address 10.10.10.21
</target>
</pre>

* enable and start the service
chkconfig tgtd on
service tgtd start

== Setup an initiator ==
* install packages
yum install iscsi-initiator-utils

* create udev rules to get persistent names

'''/etc/udev/rules.d/local.rules'''
<pre>
KERNEL=="sd*[a-z]", BUS=="scsi", SYSFS{vendor}=="VVC", PROGRAM="/etc/udev/scripts/iscsidev.sh %b",SYMLINK+="iscsi/%c{1}/lun%c{2}/disk"
KERNEL=="sd*[0-9]", BUS=="scsi", SYSFS{vendor}=="VVC", PROGRAM="/etc/udev/scripts/iscsidev.sh %b",SYMLINK+="iscsi/%c{1}/lun%c{2}/part%n"
</pre>

'''/etc/udev/scripts/iscsidev.sh'''
<source lang="bash">
#!/bin/sh

BUS=${1}
HOST=${BUS%%:*}
LUN=`echo ${BUS} | cut -d":" -f4`

[ -e /sys/class/iscsi_host ] || exit 1

file="/sys/class/iscsi_host/host${HOST}/device/session*/iscsi_session*/targetname"
target_name=$(cat ${file} | cut -d":" -f2 | sed 's/\./_/')

logger "iscsidev called with $1 and returned ${target_name} ${LUN}"
echo "${target_name} ${LUN}"
</source>

* start iscsid and discover the targets
service iscsid start
iscsiadm -m discovery -t sendtargets -p 10.10.10.55

* enable and start service
chkconfig iscsi on
service iscsi off

* check it out
<pre>
# ls -lR /dev/iscsi/
/dev/iscsi/:
total 0
drwxr-xr-x 4 root root 80 Jun 6 13:56 centos

/dev/iscsi/centos:
total 0
drwxr-xr-x 2 root root 80 Jun 6 13:58 lun1
drwxr-xr-x 2 root root 80 Jun 6 13:58 lun2

/dev/iscsi/centos/lun1:
total 0
lrwxrwxrwx 1 root root 12 Jun 6 13:56 disk -> ../../../sda
lrwxrwxrwx 1 root root 13 Jun 6 13:58 part1 -> ../../../sda1

/dev/iscsi/centos/lun2:
total 0
lrwxrwxrwx 1 root root 12 Jun 6 13:56 disk -> ../../../sdb
lrwxrwxrwx 1 root root 13 Jun 6 13:58 part1 -> ../../../sdb1

</pre>

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Vvc: /* Setup initiator */