Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Physical Data Replication for ContinentalClusters Using EMC SRDF
Setting up a Primary Package on the Primary Cluster
Chapter 7340
b. Uncomment the DEVICE_GROUP variable and set them to the
Symmetrix device group names given in the ’symdg list’
command. The DEVICE_GROUP variable may also contain the
consistency group name if using a M by N configuration.
c. Uncomment the RETRY and RETRYTIME variables. The defaults
should be used for the first package. The values should be
slightly different for other packages. RETRYTIME should increase
by two seconds for each package. The product of RETRY *
RETRYTIME should be approximately five minutes. These
variables are used to decide how often and how many times to
retry the Symmetrix status commands.
For example, if there are three packages that have data on a
particular Symmetrix pair (connected by SRDF), then the values
for RETRY and RETRYTIME might be as follows:
d. Uncomment the CLUSTER_TYPE variable and set it to continental.
10. Edit the remaining control script variables (VG, LV, FS, IP, SUBNET,
SERVICE_NAME, SERVICE_CMD and SERVICE_RESTART) according to
the needs of the application as it runs on the primary cluster. See
the MC/ServiceGuard manual for more information on these
variables.
11. Add customer-defined run and halt commands in the appropriate
places according to the needs of the application. See the
MC/ServiceGuard manual for more information on these functions.
12. Distribute EMC SRDF package configuration, environment, and
control script files to other nodes in the primary cluster by using ftp
or rcp:
# rcp -p /etc/cmcluster/<pkg_name>/<pkg_name>.cntl \
other_node:/etc/cmcluster/<pkg_name>/<pkg_name>.cntl
Table 7-2 RETRY and RETRYTIME Values
RETRYTIME RETRY
pkgA 60 5
pkgB 43 7
pkgC 33 9