Is Alive

Arcserve Continuous Availability continuously checks to see if the active host is up (according to Send pingrequest, Connect to DB, or User-Defined Script method, see below). These checks are made in scheduled intervals according to the Heartbeat Frequency.

Checking the status is interpreted as follows:

Important! When using scripts, each script must reside in the same path and with the same name on both the Master and the Replica.

Is Alive Timeout (sec)

If the standby host does not receive indication that the active host is alive during this interval (in seconds), switchover or notification is initiated. The checks are performed at the Heartbeat Frequency.

Default is 300 seconds.

Heartbeat Frequency (sec)

Interval (in seconds) for sending heartbeat requests (performing the checks below).

Default is 30 seconds.

Check Method

Send Ping Request

ICMP requests are sent automatically from the standby host to the active host, to check if the active host is up.

During the switchover, the IP is not moved from the active to the standby computer. Therefore, define two IPs for ping:

IP for ping from Master to Replica
Enter IP address to ping. When the Replica computer is the active host, an ICMP request is made from the Master to the Replica. If no reply is received within two seconds, the Replica computer is considered non-operational.

IP for ping from Replica to Master
Enter IP address to send ping to. When the Master computer is the active host, an ICMP request is made from the Replica to the Master. If no reply is received within 2 seconds, then the Master computer is considered to be non-operational.

Connect to DB

[For database applications only] When this property is set to On, Arcserve Continuous Availability connects to the active computer's database according to the Heartbeat Frequency, and checks to see if the database services are running and all databases are mounted.

User-Defined Scripts

Allows the standard check methods to be augmented or replaced by user-defined actions in scripts.

Check Script on Active Host

This script runs on the active server, and checks if it is alive.

Check script on Standby host

This script runs on the standby server, and checks if the active server it is alive.