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

Cascading Failover in a Continental Cluster
Data Storage Setup
Chapter 8372
• mkprigrp—create device group on nodes that connect to the
primary Symmetrix. Run this script only on each node that
connects to the primary Symmetrix.
• mksecgrp—create device group on nodes that connect to the
secondary Symmetrix. Run this script only on each node that
connects to the secondary Symmetrix.
• mkrecgrp—create device group on nodes that connect to the
recovery Symmetrix. Run this script only on each node that
connects to the recovery Symmetrix.
After the device groups are created, the SymCLI database can be
viewed with the commands:
• List all device groups:
# symdg list
• List the content of a device group:
# symld -g <symdevgrpname> list
• List the gatekeeper devices:
# symgate list
• List all devices and their states:
# symrdf list
9. Create a text file that contains a list of the standard device and BCV
device pair in the secondary Symmetrix. This file is required when
doing operations on the BCV devices in the secondary Symmetrix
from a node that connects to the recovery Symmetrix.
This file has two columns. The first column contains the Symmetrix
device number for the standard device. The second column contains
the Symmetrix device number for the BCV device. Refer to the
sample file midhop in the
/opt/cmcluster/toolkit/SGSRDF/cascade/Samples directory.
10. Create a text file that contains a list of the standard device and BCV
device pair in the recovery Symmetrix. This file is required when
doing operations on the BCV devices in the recovery Symmetrix from
a node that connects to the primary Symmetrix or the secondary
Symmetrix. Refer to the sample file lasthop in the
/opt/cmcluster/toolkit/SGSRDF/cascade/Samples directory.