HP EVA Cluster Extension Software Administrator Guide (5697-2445, July 2013)

Creating and configuring the user configuration file
The CLI expects as an argument the name configured as the APPLICATION tag value.
The following is an example of a customized user configuration file when using clxevarun:
---- Sample UCF.cfg begin
APPLICATION CLX030
DeviceGroup \Data Replication\DRG030 #DR group
DC_A_StorageCellWWN 50001FE15002B5A0
DC_B_StorageCellWWN 50001FE15002B570
DC_A_ManagementHosts smam019fk351k # active sma
DC_B_ManagementHosts clxeva1 # passive sma
FailsafeMode disable
DC_A_Hosts w2k7 w2k6
DC_B_Hosts w2k5 w2k8
CSObjectPathA HPEVA_ConsistencySet.InstanceID="50001FE15002B5A0.6005-08b4-
0001-2b74-0000-6000-021a-0000"
CSObjectPathB HPEVA_ConsistencySet.InstanceID="50001FE15002B570.6005-08b4-
0001-27b1-0000-7000-03fe-0000"
\n
APPLICATION CLX031
DeviceGroup \Data Replication\DRG031 #DR group
DC_A_StorageCellWWN 50001FE15002B5A0
DC_B_StorageCellWWN 50001FE15002B570
DC_A_ManagementHosts smam019fk351k # active sma
DC_B_ManagementHosts clxeva1 # passive sma
FailsafeMode disable
DC_A_Hosts w2k7 w2k6
DC_B_Hosts w2k5 w2k8
CSObjectPathA HPEVA_ConsistencySet.InstanceID="50001FE15002B5A0.6005-08b4-
0001-4cf1-0000-6000-061f-0000"
CSObjectPathB HPEVA_ConsistencySet.InstanceID="50001FE15002B570.6005-08b4-
0001-6e12-0000-7000-031a-0000"
---- Sample UCF.cfg end
Timing considerations
HP EVA Cluster Extension Software gives priority to storage system operations over cluster software
operations. If EVA Cluster Extension is invoked during a DR group member resynchronization
operation (merging) or is gathering information about the remote storage system, it waits until the
requested status information is reported. This ensures the priority of data integrity over cluster
software failover behavior.
Because the failover timing depends on the configuration of your HP EVA SMI-S server and P6000
Command View environment and the settings in the UCF.cfg file, you must evaluate the following
considerations:
• EVA Cluster Extension uses HP EVA SMI-S to communicate with the HP EVA storage system,
depending on the settings of the SMI-S request timeout property, and the number of managed
EVA arrays, the online operation could time out. This can also happen if clxevarun is used
in a script or called by another program and the HP SMI-S server instance(s) cannot be reached.
• In the UCF.cfg file, if the ApplicationStartup attribute is set to RESYNCWAIT, EVA Cluster
Extension tries to resynchronize disk pairs and waits until the DR group is in a normal state.
Depending on the amount of data to be transferred, it could take hours to resynchronize. If
this is the case, clxevarun may take some time to return. Do not stop clxevarun; use the
SSSU command show DR_GROUP full-path/dr-group-name or the P6000 Command
View or EVA Continuous Access GUI to check the status of the DR groups.
• Depending on the amount of data that is out of sync between the source and destination vdisk
while the EVA Continuous Access replication link(s) is unavailable, a merge/resynchronization
or a full copy operation is initiated when the EVA CA replication link(s) is re-established. The
Configuring the CLI 69