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diff --git a/doc/rbd/iscsi-initiator-linux.rst b/doc/rbd/iscsi-initiator-linux.rst new file mode 100644 index 000000000..bf8c930f3 --- /dev/null +++ b/doc/rbd/iscsi-initiator-linux.rst @@ -0,0 +1,119 @@ +------------------------- +iSCSI Initiator for Linux +------------------------- + +**Prerequisite:** + +- Package ``iscsi-initiator-utils`` + +- Package ``device-mapper-multipath`` + +**Installing:** + +Install the iSCSI initiator and multipath tools: + +.. prompt:: bash # + + yum install iscsi-initiator-utils + yum install device-mapper-multipath + +**Configuring:** + +#. Create the default ``/etc/multipath.conf`` file and enable the + ``multipathd`` service: + + .. prompt:: bash # + + mpathconf --enable --with_multipathd y + +#. Add the following to the ``/etc/multipath.conf`` file: + + :: + + devices { + device { + vendor "LIO-ORG" + product "TCMU device" + 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: + + .. prompt:: bash # + + systemctl reload multipathd + +**iSCSI Discovery and Setup:** + +#. Enable CHAP authentication and provide the initiator CHAP username + and password by uncommenting and setting the following options in + the ``/etc/iscsi/iscsid.conf`` file: + + :: + + node.session.auth.authmethod = CHAP + node.session.auth.username = myusername + node.session.auth.password = mypassword + + If you intend to use mutual (bidirectional) authentication, provide the + target CHAP username and password: + + :: + + node.session.auth.username_in = mytgtusername + node.session.auth.password_in = mytgtpassword + +#. Discover the target portals: + + .. prompt:: bash # + + 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 + +#. Log in to the target: + + .. prompt:: bash # + + iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.rheln1 -l + +**Multipath IO Setup:** + +#. The multipath daemon (``multipathd``) uses the ``multipath.conf`` settings + to set up devices automatically. Running the ``multipath`` command shows + that the devices have been set up in a failover configuration. Notice that + each path has been placed into its own priority group: + + .. prompt:: bash # + + 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 in the same way that you would + use a normal multipath iSCSI disk. + +#. Log out of the target: + + .. prompt:: bash # + + iscsiadm -m node -T iqn.2003-01.org.linux-iscsi.rheln1 -u |