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|
-------------------------
iSCSI Initiator for Linux
-------------------------
**Prerequisite:**
- Package ``iscsi-initiator-utils``
- Package ``device-mapper-multipath``
**Installing:**
Install the iSCSI initiator and multipath tools:
::
# yum install iscsi-initiator-utils
# yum install device-mapper-multipath
**Configuring:**
#. Create the default ``/etc/multipath.conf`` file and enable the
``multipathd`` service:
::
# mpathconf --enable --with_multipathd y
#. Add the following to ``/etc/multipath.conf`` file:
::
devices {
device {
vendor "LIO-ORG"
hardware_handler "1 alua"
path_grouping_policy "failover"
path_selector "queue-length 0"
failback 60
path_checker tur
prio alua
prio_args exclusive_pref_bit
fast_io_fail_tmo 25
no_path_retry queue
}
}
#. Restart the ``multipathd`` service:
::
# systemctl reload multipathd
**iSCSI Discovery and Setup:**
#. If CHAP was setup on the iSCSI gateway, provide a CHAP username and
password by updating the ``/etc/iscsi/iscsid.conf`` file accordingly.
#. Discover the target portals:
::
# iscsiadm -m discovery -t st -p 192.168.56.101
192.168.56.101:3260,1 iqn.2003-01.org.linux-iscsi.rheln1
192.168.56.102:3260,2 iqn.2003-01.org.linux-iscsi.rheln1
#. Login to target:
::
# iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.rheln1 -l
**Multipath IO Setup:**
The multipath daemon (``multipathd``), will set up devices automatically
based on the ``multipath.conf`` settings. Running the ``multipath``
command show devices setup in a failover configuration with a priority
group for each path.
::
# multipath -ll
mpathbt (360014059ca317516a69465c883a29603) dm-1 LIO-ORG ,IBLOCK
size=1.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='queue-length 0' prio=50 status=active
| `- 28:0:0:1 sde 8:64 active ready running
`-+- policy='queue-length 0' prio=10 status=enabled
`- 29:0:0:1 sdc 8:32 active ready running
You should now be able to use the RBD image like you would a normal
multipath’d iSCSI disk.
|
