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

Physical Data Replication for ContinentalClusters Using EMC SRDF
Preparing a Continental Cluster for Data Replication
Chapter 7328
• Symmetrix serial number
Gatekeeper devices are usually of size 2880. The Symmetrix device
serial number is useful in matching the devices to the actual devices
in the Symmetrix configuration (downloaded by EMC). The following
is a key to interpreting the number:
• The first two digits equal the last two digits of the serial number
of the Symmetrix frame.
• The next three hexidecimal digits equal the Symmetrix device
number that is seen in the output of the status command:
# symrdf -g <symdevgrpname> query
and is used by the ContinentalCluster/SRDF control script and
saved in the file
/etc/cmcluster/<pkg_name>/symrdf.out
The contents of this file may be useful for debugging purposes.
• The next three digits equal the Symmetrix host adapter (SA or
FA) and port numbers; this is useful to see multiple host links to
the same Symmetrix device (PVLinks).
5. Get a list of the disk devices known to the host system. Use the
following command:
# insf -e
Then run one of the following:
# ioscan -kfnC disk
or the preferred form:
# ioscan -fnC disk
Match the device file names in this listing with the device file names
in the output from the syminq command to see which devices are
seen from this host to make sure that this host can see all necessary
devices.
6. Use the Symmetrix ID to determine to which Symmetrix the host is
connected. Then use the Symmetrix device number to determine
which devices are the same logical device seen by each host system
that is connected to the same Symmetrix unit and record the special
device file names for later use.
It is recommended that you create a table with: