blob: bf8c930f30c7b150122f9f540fadf931e38f6eb0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
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
|
