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