blob: 51248e46f7906316421a9a262ffb8039c78a29f8 (
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
|
------------------------------------------------
The iSCSI Initiator for Red Hat Enterprise Linux
------------------------------------------------
**Prerequisite:**
- Package ``iscsi-initiator-utils-6.2.0.873-35`` or newer must be
installed
- Package ``device-mapper-multipath-0.4.9-99`` or newer must be
installed
**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
``multiapthd`` 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_oi_fail_tmo 25
no_path_retry queue
}
}
#. Restart the ``multipathd`` service:
::
# systemctl reload multipathd
**iSCSI Discovery and Setup:**
#. Discover the target portals:
::
# iscsiadm -m discovery -t -st 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.
|
