Users Guide
3 Multipath conguration can be veried with the information in /etc/multipath.conf le by utilizing following commands.
multipath -v2 –d
multipath -v3 –d
Once the above commands are veried to be successful, the multipath devices are available at /dev/mapper/mpathX by default
where X is multipath eligible devices.
You can use multipath-ll to verify the status of the multipath conguration. The output should be similar to the details shown below:
linux-ha-2:~ #multipath –ll
mpathc (3690b11c025a5ef001b289a2f60d160b6) dm-1 DELL, Shared PERC8
size=50G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 1:2:1:0 sdc 8:32 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 2:2:1:0 sde 8:64 active ready running
mpathb (3690b11c025a5ef001b2895c11d374ab5) dm-0 DELL, Shared PERC8
size=10G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 1:2:0:0 sdb 8:16 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 2:2:0:0 sdd 8:48 active ready running
In the above output, the status eld shows us whether a path is active or enabled. The active path services the IO. Priority eld is
also used with status eld to identify the path to be used with highest priority. Also each path has a unique access identier to the
shared VD. (For mpathc it is /dev/sdc and /dev/sde.)
Multipath les for Linux multipath conguration
The following are sample multipath.conf les that can be used for Linux multipath conguration. The les may require modication based on
your particular conguration requirements.See the documentation provide by the Linux distribution vendor for further guidance on
multipath conguration.
RHEL 6.5, 6.6, 6.7
defaults {
verbosity 2
polling_interval 10
checker_timeout 90
}
Multipath and clustering setup
43