HP VMA SAN, Installation And Configuration Manual

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AM456-9025A HP VMA SAN Gateway Installation and Configuration Guide 67
In the above example, support for Memory Array devices was added. When configuring this
file, pay particular attention to the following:
•
path_grouping_policy
should be set to
group_by_serial
•
getuid_callout
should be set
•
path_checker
should be
tur(TEST_UNIT_READY)
•
failback
should be immediate
•
rr_weight
should be uniform since weights are not assigned to the individual paths
•
no_path_retry
should be set to immediately bring path back online
•
rr_min_io
should be set to
4
, but can be subject to change depending on the environment and
workload.
2.
Save the
multipath.conf
file and proceed with Configuring the Multipath Daemon .
Configuring the Multipath Daemon
This section demonstrates how to configure the multipath daemon (
multipathd
) so that it starts
when the system boots up.
To configure the multipath daemon, do the following:
1.
Use the
chkconfig
command to add (
-a
) the multipath daemon (
multipathd
) as a service.
2.
Restart the multipath service, using the
service restart
command.
3.
Verify that the multipath service is running, using the
multipath -ll
command.
The following example demonstrates these steps for a single LUN that is accessible through two
Fibre Channel (FC) ports that are multipathed into a single multipath device (
/dev/mapper/
mpath1
).
#
chkconfig -a multipathd
#
service multipathd restart
#
multipath -ll
mpath176 (36001b97074dc2dff74dc2dfe97c7089e) dm-0 VIOLIN, ARRAY
[size=1.0G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
\_ 5:0:2:1 sdl 8:176 [active][ready]
\_ 5:0:3:1 sdm 8:192 [active][ready]
mpath11 (36001b97074dc2dff74dc2dfeb6ecc00a) dm-1 VIOLIN, ARRAY
[size=1.0G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
\_ 5:0:2:2 sdx 65:112 [active][ready]
\_ 5:0:3:2 sdy 65:128 [active][ready]