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

Physical Data Replication for ContinentalClusters Using Continuous Access XP
Preparing the Continental Cluster for Data Replication
Chapter 6 289
If there are no configured command devices on the disk array, you
must create two before proceeding. Each command device must have
alternate links (PVLinks). The first command device is the primary
command device. The second command device is a redundant
command device and is used only upon failure of the primary
command device. The command devices must be mapped to the
various host interfaces by using the SVP (disk array console) or a
remote console.
5. Copy the default Raid Manager configuration file to an
instance-specific name. Example:
# cp /etc/horcm.conf /etc/horcm0.conf
6. Create a minimum Raid Manager configuration file by editing the
following fields in the file created in the previous step:
• HORCM_MON—enter the host-name of the system on which you are
editing and the TCP/IP port number specified for this Raid
Manager instance in the /etc/services file.
• HORCM_CMD—enter the primary and alternate link device file
names for both the primary and redundant command devices (for
a total of four raw device file names).
WARNING Make sure that the redundant command device is NOT on
the same physical device as the primary command device.
Also, make sure that it is on a different bus inside the XP
series disk array.
7. If the Raid Manager protection facility is enabled, export the
HORCPERM environment variable to the HORCM permission file:
# export HORCMPERM=/etc/horcmperm0.conf
If the Raid Manager protection facility is not used or disabled, export
the HORCPERM environment variable as follows:
# export HORCMPERM=MGRNOINST
8. Start the Raid Manager instance by using the command
horcmstart.sh <instance-#>. For example:
# horcmstart.sh 0