Iscsi - target and initiator setup debian: Difference between revisions

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<pre>
<pre>
http://iscsitargetandinitiator.blogspot.dk/
http://iscsitargetandinitiator.blogspot.dk/
</pre>

== Show target devices and initiators connected ==
<pre>
tgtadm --lld iscsi --op show --mode target
</pre>

== Add devices/disks/partitions to target ==
<pre>
tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/sdb
</pre>
</pre>


Line 27: Line 37:


More info here: http://www.sysarchitects.com/iscsi_target_on_rhel6
More info here: http://www.sysarchitects.com/iscsi_target_on_rhel6

On debian I couldn't get this to work; I found a simple init-script from RH bugzillatracker which did the trick:

<pre>
#!/bin/sh
### BEGIN INIT INFO
# Provides: tgtd
# Required-Start: $network $syslog
# Required-Stop: $network $syslog
# Default-Start: 2 3 4 5
# Default-Stop:
# Short-Description: Start the iSCSI target server tgt
# Description: iSCSI target server tgt (http://stgt.sf.net)
### END INIT INFO

set -e

TGTD="/usr/sbin/tgtd"
TGTADMIN="/usr/sbin/tgt-admin"
DEFAULTS="/etc/default/tgt"

# Check for daemon presence
[ -x "$TGTD" ] || exit 0

OPTIONS=""
MODULES=""
# Include tgtd defaults if available
[ -r "$DEFAULTS" ] && . "$DEFAULTS"

# Get lsb functions
. /lib/lsb/init-functions

case "$1" in
start)
log_begin_msg "Starting iSCSI target (tgt) services..."
start-stop-daemon --start --quiet --oknodo --exec "$TGTD" -- $OPTIONS
[ -x "$TGTADMIN" ] && $TGTADMIN -e
log_end_msg $?
;;
stop)
log_begin_msg "Stopping iSCSI target (tgt) services..."
start-stop-daemon --stop --quiet --oknodo --retry 2 --exec "$TGTD"
log_end_msg $?
;;
restart)
$0 stop
sleep 1
$0 start
;;
reload|force-reload)
log_begin_msg "Reloading iSCSI target (tgt) services..."
start-stop-daemon --stop --signal 1 --exec "$TGTD"
log_end_msg $?
;;
status)
status_of_proc "$TGTD" tgtd
;;
*)
log_success_msg "Usage: /etc/init.d/tgt {start|stop|restart|reload|force-reload|status}"
exit 1
esac
</pre>

== Generating config file of disks/partitions ==
<pre>
tgt-admin -dump > /etc/tgt/targets.conf
</pre>

== iSCSI with HA ==
Attached pdf document which describes DRBD, Pacemaker and iSCSI setup:

[[File:ha-iscsi.pdf]]


== iSCSI Linux links ==
[http://www.zoobey.com/index.php/resources/all-articles-list/451-linux-tgtadm-setup-iscsi-target--san- Good tgt-based setup]

[http://www.sysarchitects.com/iscsi_target_on_rhel6 Howto add UDEV rules for exposed disks]

[http://www.howtoforge.com/using-iscsi-on-debian-squeeze-initiator-and-target Simple howto with debian initiator and target]

[http://wiki.debian.org/SAN/iSCSI/open-iscsi initiator non-tgt setup]

[http://www.cyberciti.biz/faq/howto-setup-debian-ubuntu-linux-iscsi-initiator/ Simple setup]

[http://www.howtoforge.com/using-iscsi-on-debian-lenny-initiator-and-target open open-iscsi]

Latest revision as of 12:07, 30 November 2012


iSCSI - target (server) setup

We'll use tgt to handle everything dynamically

iSCSI - initiator (client) setup

Link to page:

http://iscsitargetandinitiator.blogspot.dk/

Show target devices and initiators connected

tgtadm --lld iscsi --op show --mode target

Add devices/disks/partitions to target

tgtadm  --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/sdb


Re-adding LVM based iscsi disks after reboot

Requires a change in how LVM 'attaches' to disks.

So if you've added say /dev/sdb to be a complete iscsi device and on the initiator using it as a LVM, it does not attach itself to the target on reboot.

Edit /etc/lvm/lvm.conf and change:

   # By default we accept every block device:
    #filter = [ "a/.*/" ]
    # Every block device except /dev/sdb, that is.
    filter = [ "r|/dev/sdb|" ]

More info here: http://www.sysarchitects.com/iscsi_target_on_rhel6

On debian I couldn't get this to work; I found a simple init-script from RH bugzillatracker which did the trick:

#!/bin/sh
### BEGIN INIT INFO
# Provides:          tgtd
# Required-Start:    $network $syslog
# Required-Stop:     $network $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      
# Short-Description: Start the iSCSI target server tgt
# Description:       iSCSI target server tgt (http://stgt.sf.net)
### END INIT INFO

set -e

TGTD="/usr/sbin/tgtd"
TGTADMIN="/usr/sbin/tgt-admin"
DEFAULTS="/etc/default/tgt"

# Check for daemon presence
[ -x "$TGTD" ] || exit 0

OPTIONS=""
MODULES=""
# Include tgtd defaults if available
[ -r "$DEFAULTS" ] && . "$DEFAULTS"

# Get lsb functions
. /lib/lsb/init-functions

case "$1" in
  start)
    log_begin_msg "Starting iSCSI target (tgt) services..."
    start-stop-daemon --start --quiet --oknodo --exec "$TGTD" -- $OPTIONS
    [ -x "$TGTADMIN" ] && $TGTADMIN -e
    log_end_msg $?
    ;;
  stop)
    log_begin_msg "Stopping iSCSI target (tgt) services..."
    start-stop-daemon --stop --quiet --oknodo --retry 2 --exec "$TGTD"
    log_end_msg $?
    ;;
  restart)
    $0 stop
    sleep 1
    $0 start
    ;;
  reload|force-reload)
    log_begin_msg "Reloading iSCSI target (tgt) services..."
    start-stop-daemon --stop --signal 1 --exec "$TGTD"
    log_end_msg $?
    ;;
  status)
    status_of_proc "$TGTD" tgtd
    ;;
  *)
    log_success_msg "Usage: /etc/init.d/tgt {start|stop|restart|reload|force-reload|status}"
    exit 1
esac

Generating config file of disks/partitions

tgt-admin -dump > /etc/tgt/targets.conf

iSCSI with HA

Attached pdf document which describes DRBD, Pacemaker and iSCSI setup:

File:Ha-iscsi.pdf


iSCSI Linux links

Good tgt-based setup

Howto add UDEV rules for exposed disks

Simple howto with debian initiator and target

initiator non-tgt setup

Simple setup

open open-iscsi