5 monitoring failover pairs, 7 testing your configuration – HP StorageWorks Scalable File Share User Manual
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This forces you to manually start the Heartbeat service and the file system after a file system
server node is rebooted.
5.5 Monitoring Failover Pairs
Use the crm_mon command to monitor resources in a failover pair.
In the following sample crm_mon output, there are two nodes that are Lustre OSSs, and eight
OSTs, four for each node.
============
Last updated: Thu Sep 18 16:00:40 2008
Current DC: n4 (0236b688-3bb7-458a-839b-c19a69d75afa)
2 Nodes configured.
10 Resources configured.
============
Node: n4 (0236b688-3bb7-458a-839b-c19a69d75afa): online
Node: n3 (48610537-c58e-48c5-ae4c-ae44d56527c6): online
Filesystem_1 (heartbeat::ocf:Filesystem): Started n3
Filesystem_2 (heartbeat::ocf:Filesystem): Started n3
Filesystem_3 (heartbeat::ocf:Filesystem): Started n3
Filesystem_4 (heartbeat::ocf:Filesystem): Started n3
Filesystem_5 (heartbeat::ocf:Filesystem): Started n4
Filesystem_6 (heartbeat::ocf:Filesystem): Started n4
Filesystem_7 (heartbeat::ocf:Filesystem): Started n4
Filesystem_8 (heartbeat::ocf:Filesystem): Started n4
Clone Set: clone_9
stonith_9:0 (stonith:external/riloe): Started n4
stonith_9:1 (stonith:external/riloe): Started n3
Clone Set: clone_10
stonith_10:0 (stonith:external/riloe): Started n4
stonith_10:1 (stonith:external/riloe): Started n3
The display updates periodically until you interrupt it and terminate the program.
5.6 Moving and Starting Lustre Servers Using Heartbeat
Lustre servers can be moved between nodes in a failover pair, and stopped, or started using the
Heartbeat command crm_resource. The local file systems corresponding to the Lustre servers
appear as file system resources with names of the form Filesystem_n, where n is an integer.
The mapping from file system resource names to Lustre server mount-points is found in cib.xml.
For example, to move Filesystem_7 from its current location to node 11:
# crm_resource -H node11 -M -r Filesystem_7
The destination host name is optional but it is important to note that if it is not specified,
crm_resource
forces the resource to move by creating a rule for the current location with the
value -INFINITY. This prevents the resource from running on that node again until the constraint
is removed with crm_resource -U.
If you cannot start a resource on a node, check that node for values of -INFINITY in /var/lib/
heartbeat/crm/cib.xml
. There should be none. For more details, see the crm_resource
manpage. See also
.
5.7 Testing Your Configuration
The best way to test your Lustre file system is to perform normal file system operations, such as
normal Linux file system shell commands like df, cd, and ls. If you want to measure performance
of your installation, you can use your own application or the standard file system performance
benchmarks described in Chapter 17 Benchmarking of the Lustre 1.8 Operations Manual at:
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Using HP SFS Software