HP P6000 Cluster Extension Software Administrator Guide (5697-0986, June 2011)

• For RHCS, the configuration file /etc/opt/hpclxeva/conf/CLXEVA.config is associated
with the RHCS service CLXWEB that is configured to use the P6000 Cluster Extension resource
agent script. RHCS invokes the resource agent script to start the CLXWEB service. The CLXWEB
service checks the DR group member states before the volume groups vgweb and vghtdocs are
activated and the web server is started. The P6000/EVA DR group \Data Replication\
clxwebdrg includes all vdisks for the LVM volume groups vgweb and vghtdocs. The sample
CLXEVA.config file shows the contents of the configuration file with the described failover be-
havior.
For SLE HA, the configuration file /etc/opt/hpclxeva/conf/CLXEVA.config is associated
with the SLE HA resource CLXWEB. SLE HA invokes the resource agent script /usr/lib/ocf/
resource.d/heartbeat/CLXEVA, which checks the DR group member states before the volume
groups vgweb and vghtdocs are activated and the web server is started. The P6000/EVA DR
group \Data Replication\clxwebdrg includes all vdisks for the LVM volume groups vgweb
and vghtdocs. The sample CLXEVA.config file shows the contents of the configuration file
with the described failover behavior.
Sample CLXEVA.config file:
APPLICATION CLXWEB
DC_A_StorageCellWWN 50001FE100270C30
DC_B_StorageCellWWN 50001FE100270CA0
DeviceGroup \Data Replication\clxwebdrg
DC_A_Hosts Host1 Host2
DC_B_Hosts Host3 Host4
DC_A_ManagementHosts clxsmaxlxla
DC_B_ManagementHosts clxsmaxlxlb
CSObjectPathA \ HPEVA_ConsistencySet.InstanceID="50001FE100270C30.6005-08b4-0010
-30ee-0000-7000-7315-0000"
CSObjectPathB \ HPEVA_ConsistencySet.InstanceID="50001FE100270CA0.6005-08b4-0010-
2971-0000-8001-3feb-0000"
ApplicationStartup RESYNCWAIT
• The service (RHCS) or resource group (SLE HA) is configured to wait for a DR merge or full copy
by setting the ApplicationStartup value to RESYNCWAIT.
• P6000 Cluster Extension enables read/write access to the DR group used for the CLXWEB service.
Activation of the volume groups depends on a successful return code from P6000 Cluster Extension.
The logical volumes can be mounted only when their volume groups are active and P6000 Cluster
Extension allows read/write access to the disk group. After the file system for the web server's
executable files and content data is mounted and checked, the NIC is configured with the web
server's IP address.
Configuring P6000 Cluster Extension with RHCS
P6000 Cluster Extension Software is integrated with the RHCS using an RHCS shared resource. P6000
Cluster Extension provides a resource agent script (clxeva.sh) that allows you to manage P6000
Cluster Extension resources.
The executable clxevalxcs is called by P6000 Cluster Extension before volume group activation.
This checks the status of a P6000/EVA DR group associated with a volume group configured for use
with an RHCS service. If necessary, P6000 Cluster Extension takes appropriate actions to allow access
to the volume group's physical disks before attempting to activate and mount the logical volume on
a cluster node.
Configuring P6000 Cluster Extension for Linux56