Designing Disaster Recovery Clusters using Metroclusters and Continentalclusters, Reprinted October 2011 (5900-1881)

Following are the guidelines that you must follow while configuring the Site Controller Package:
• The default value of the priority parameter is set to no_priority. The Site Controller
Package should not be subjected to any movement because of package prioritization. So do
not change this default value.
• The default value of the failover_policy parameter for the Site Controller Package is set
to site_preferred. Based on your requirement, the value can be set to
site_preferred_manual.
The site_preferred value implies that during a Site Controller Package failover, while
selecting nodes from the list of the node_name entries, the Site Controller Package fails over
to the nodes that belong to the site of the node it last ran on, rather than the nodes that belong
to the other site. The site_preferred_manual failover policy provides automatic failover
of packages within a site and manual failover across sites.
Complete the following procedure to configure the Site Controller Package for the complex workload:
1. Create the Site Controller Package directory on all nodes at both sites:
mkdir -m 755 /etc/cmcluster/cw_sc
2. From any node, create a Site Controller Package configuration file using the dts/sc module.
cmmakepkg -m dts/sc /etc/cmcluster/cw_sc/cw_sc.config
IMPORTANT: When using Metrocluster with Continuous Access XP A.10.00 or later,
Metrocluster with Continuous Access EVA A.05.00 or later, or Metrocluster with EMC SRDF
A.09.00 or later, the cmmakepkg command must be used in conjunction with the array-specific
modular package configuration file.
For example, for Metrocluster with Continuous Access for P9000 and XP, the command is:
cmmakepkg -m dts/sc –m dts/mcxpca cw_sc.config
For Metrocluster with Continuous Access EVA, the command is:
cmmakepkg -m dts/sc –m dts/mccaeva cw_sc.config
For Metrocluster with EMC SRDF, the command is:
cmmakepkg -m dts/sc –m dts/mcsrdf cw_sc.config
3. Edit the cw_sc.config file and specify the following:
IMPORTANT: Ensure there are no packages configured with the critical_package or
managed_package attributes in the Site Controller Package configuration file.
a. Name for the package_name attribute:
package_name cw_sc
b. Names of the nodes explicitly using the node_name attribute.
c. The directory created in step 1 for the dts/dts/dts_pkg_dir attribute.
dts/dts/dts_pkg_dir /etc/cmcluster/cw_sc
It is recommended that the Site Controller package configuration file is located in the
dts/dts/dts_pkg_dir directory.
d. Specify a name for the log file.
script_log_file /etc/cmcluster/cw_sc/cw_sc.log
e. Specify the sites without any packages.
Do not specify any packages using the critical_package or managed_package
attributes.
site site1
356 Designing a Disaster Recovery Solution Using Site Aware Disaster Tolerant Architecture