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

Building a Metropolitan Cluster Using MetroCluster/CA
XP/CA Device Group Monitor
Chapter 3118
• If you want to receive notification messages over email, uncomment
the MON_NOTIFICATION_EMAIL variable and set it to a fully qualified
email address. Multiple email addresses can be configured using
comma as separator between the addresses.
• If you want notification messages to be logged in the syslog file,
uncomment the MON_NOTIFICATION_SYSLOG variable and set it to 1.
• If you want notification messages to be logged on the system's
console, uncomment the MON_NOTIFICATION_CONSOLE variable and
set it to 1.
• If you want an automatic resynchronization upon link recovery,
uncomment the AUTO_RESYNC variable and set it to either 0, 1 or 2.
If AUTO_RESYNC is set to 0 (DEFAULT), the monitor will not try to do
the resynchronization from PVOL to SVOL. This setting will only
send notifications.
If AUTO_RESYNC is set to 1, the monitor will split the remote BC if one
is configured from the mirror group before trying to do the
resynchronization from PVOL to SVOL.
If AUTO_RESYNC is set to 2, the monitor will only do the
resynchronization from PVOL to SVOL when it finds the
MON_RESYNC file in the package directory on the node that the
package is running. The monitor will not manage the remote BC
prior to and after the resynchronization. This setting is used if the
user wants to manage the BC themselves.
To enable the CA resynchronization for AUTO_RESYNC=2, it is
necessary to create a file using the HP-UX command touch. For
example:
# touch /etc/cmcluster/packageA/MON_RESYNC
(where /etc/cmcluster/packageA is the package directory)
After the monitor detects the MON_RESYNC file, it is automatically
removed.
The following is an example of the XP/CA device group monitor
definition section in the environment file
(<packagename>_xpca.env>) where the monitor will perform the
following:
• poll every 15 minutes.