Designing a Disaster Tolerant Solution Using the Three Data Center Architecture
Designing a Disaster Tolerant Architecture Using Three Data Center with Continuous Access XP
Chapter 6 397
• DC1_DC2_DEVICE_GROUP=”dg”
• DC2_DC3_DEVICE_GROUP=”dg_p”
• DC1_DC3_DEVICE_GROUP=”dg_1”
For Three Data Center Multi-Hop topology:
• DC2_DC3 must use Continuous Access-Journal
• DC1_DC3 uses phantom device
A typical definition of values would be as follows:
• DC1_DC2_DEVICE_GROUP=”dg”
• DC2_DC3_DEVICE_GROUP=”dg_1”
• DC1_DC3_DEVICE_GROUP=”dg_p”
The phantom device group, defined in the RAID Manager
configuration files, is used as a bridge to access the remote site
pair state.
NOTE See Appendix A of this guide for a full description of these
environment variables.
l. The values for the following variables are the same as the default
values defined in the configuration file:
MULTIPLE_PVOL_OR_SVOL_FRAMES_FOR_PKG, HORCTIMEOUT and
WAITTIME. These variables may need to be configured based on
your particular requirements.
m. All the remaining variables in the Environment file may remain
commented out.
7. After customizing the control script file and creating the
environment file, and before starting up the package, do a syntax
check on the control script using the following command: (be sure to
include the -n option to perform syntax checking only)
# sh -n <pkgname.cntl>
If any messages are returned, correct the syntax errors.