Ubuntu 12.04 iSCSI Configuration

Configure Storage Server with iSCSI. A storage on a network is called iSCSI Target, a Client which connects to iSCSI Target is called iSCSI Initiator.

This example is based on the environment below.

dlp.server.world

[10.0.0.30] - iSCSI Target

www.server.world

[10.0.0.31] - iSCSI Initiator

This example configures to create LVM partition on iSCSI Target, so it need to have enough areas to use. If your iSCSI Target does not have enough areas, add new hard drive.

[1]
Configure iSCSI Target

# create a phisical volume

root@dlp:~#

pvcreate /dev/sdb1

  Physical volume "/dev/sdb1" successfully created

# create a volume group named "vg_target00"

root@dlp:~#

vgcreate -s 32M vg_target00 /dev/sdb1

  Volume group "vg_target00" successfully created

# create a logical volume named "lv_target00"

root@dlp:~#

lvcreate -L 100G -n lv_target00 vg_target00

  Logical volume "lv_target00" created

root@dlp:~#

aptitude -y install iscsitarget iscsitarget-dkms

root@dlp:~#

vi /etc/default/iscsitarget

# change

ISCSITARGET_ENABLE=

true

root@dlp:~#

vi /etc/iet/ietd.conf

# add at the last

# naming rule : [ iqn.yaer-month.domain:any name ]

Target iqn.2012-07.world.server:target0

# provided devicce as a iSCSI target

    Lun 0 Path=/dev/vg_target00/lv_target00,Type=blockio

# iSCSI Initiator's IP address you allow to connect

    initiator-address 10.0.0.31

# authentication info ( set anyone you like for "username", "password" )

    incominguser username password

root@dlp:~#

service iscsitarget restart

* Removing iSCSI enterprise target devices:
...done.
* Stopping iSCSI enterprise target service:
...done.
* Removing iSCSI enterprise target modules:
...done.
* Starting iSCSI enterprise target service
...done.
...done.
root@dlp:~#

chkconfig tgtd on

root@dlp:~#

ietadm --op show --tid=1

# confirm status

Wthreads=8
Type=0
QueuedCommands=32
NOPInterval=0
NOPTimeout=0

[2]

Complete to configure iSCSI Target. See next step to configure iSCSI Initiator.

Configure iSCSI Initiator. This example is based on the environment below.

dlp.server.world

[10.0.0.30] - iSCSI Target

www.server.world

[10.0.0.31] - iSCSI Initiator

[1]
Configure iSCSI Initiator

root@www:~#

aptitude -y install open-iscsi

root@www:~#

vi /etc/iscsi/iscsid.conf

# line 39: uncomment

node.session.auth.authmethod = CHAP

# line 43,44: uncomment and set username and password which set on iSCSI Target

node.session.auth.username =

username

node.session.auth.password =

password

# discover target

root@www:~#

iscsiadm -m discovery -t sendtargets -p 10.0.0.30

10.0.0.30:3260,1 iqn.2012-07.world.server:target0

# confirm status after discovery

root@www:~#

iscsiadm -m node -o show

# BEGIN RECORD 2.0-871 node.name = iqn.2012-07.world.server:target0
node.tpgt = 1
node.startup = manual
iface.hwaddress = <empty>
iface.ipaddress = <empty>
iface.iscsi_ifacename = default
iface.net_ifacename = <empty>
iface.transport_name = tcp
iface.initiatorname = <empty>
node.discovery_address = 10.0.0.30
node.discovery_port = 3260
node.discovery_type = send_targets
node.session.initial_cmdsn = 0
node.session.initial_login_retry_max = 8
node.session.xmit_thread_priority = -20
node.session.cmds_max = 128
node.session.queue_depth = 32
node.session.auth.authmethod = CHAP
node.session.auth.username = username
node.session.auth.password = ********
node.session.auth.username_in = <empty>
node.session.auth.password_in = <empty>
node.session.timeo.replacement_timeout = 120
node.session.err_timeo.abort_timeout = 15
node.session.err_timeo.lu_reset_timeout = 20
node.session.err_timeo.host_reset_timeout = 60
node.session.iscsi.FastAbort = Yes
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.session.iscsi.DefaultTime2Retain = 0
node.session.iscsi.DefaultTime2Wait = 2
node.session.iscsi.MaxConnections = 1
node.session.iscsi.MaxOutstandingR2T = 1
node.session.iscsi.ERL = 0
node.conn[0].address = 10.0.0.30
node.conn[0].port = 3260
node.conn[0].startup = manual
node.conn[0].tcp.window_size = 524288
node.conn[0].tcp.type_of_service = 0
node.conn[0].timeo.logout_timeout = 15
node.conn[0].timeo.login_timeout = 15
node.conn[0].timeo.auth_timeout = 45
node.conn[0].timeo.noop_out_interval = 5
node.conn[0].timeo.noop_out_timeout = 5
node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144
node.conn[0].iscsi.HeaderDigest = None
node.conn[0].iscsi.DataDigest = None
node.conn[0].iscsi.IFMarker = No
node.conn[0].iscsi.OFMarker = No
# END RECORD

# login to target

root@www:~#

iscsiadm -m node --login

Logging in to [iface: default, target: iqn.2012-07.world.server:target0, portal: 10.0.0.30,3260]
Login to [iface: default, target: iqn.2012-07.world.server:target0, portal: 10.0.0.30,3260]: successful

# confirm session

root@www:~#

iscsiadm -m session -o show

tcp: [1] 10.0.0.30:3260,1 iqn.2012-07.world.server:target0

# confirm partitions

root@www:~#

cat /proc/partitions

major minor #blocks name

8

0

31457280

sda

8

1

512000

sda1

8

2

30944256

sda2

253

0

20971520

dm-0

253

1

6160384

dm-1

253

2

3809280

dm-2

8

16

104857600

sdb

# added new device provided from target

[2]

Complete to configure iSCSI Initiator. It's possible to use the provided device from iSCSI Target as a local device.