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Table of Contents

Administration Guide

Troubleshoot HA issues

Problem

Active-passive HA cluster does not switch to the secondary unit after a failure.

Solution

If an individual service has failed that does not disrupt the HA heartbeat, an active-passive HA cluster may not fail over. For example, it is possible that one or more services (such as SMTP, IMAP, POP3, web access, or a hard drive or network interface) could fail on the primary unit without affecting the HA heartbeat.

To cause failover when an individual service fails, configure service monitoring (see Configuring service-based failover) on both the primary unit and secondary unit.

See also 

Monitoring the HA status

Configuring service-based failover

Problem

Mail queues do not appear on the HA secondary unit.

Solution

In order to display queue content in the secondary unit, mail data must be synchronized from the primary unit. If the Backup MTA queue directories option is disabled, mail queues will not be synchronized. You can enable MTA spool synchronization to view the mail queues from either the secondary or primary unit.

Note

Synchronization of MTA spool directories can result in decreased performance, and may not let you to view all email in the mail queues, as mail queue content can change more rapidly than synchronization occurs.

Troubleshoot HA issues

Problem

Active-passive HA cluster does not switch to the secondary unit after a failure.

Solution

If an individual service has failed that does not disrupt the HA heartbeat, an active-passive HA cluster may not fail over. For example, it is possible that one or more services (such as SMTP, IMAP, POP3, web access, or a hard drive or network interface) could fail on the primary unit without affecting the HA heartbeat.

To cause failover when an individual service fails, configure service monitoring (see Configuring service-based failover) on both the primary unit and secondary unit.

See also 

Monitoring the HA status

Configuring service-based failover

Problem

Mail queues do not appear on the HA secondary unit.

Solution

In order to display queue content in the secondary unit, mail data must be synchronized from the primary unit. If the Backup MTA queue directories option is disabled, mail queues will not be synchronized. You can enable MTA spool synchronization to view the mail queues from either the secondary or primary unit.

Note

Synchronization of MTA spool directories can result in decreased performance, and may not let you to view all email in the mail queues, as mail queue content can change more rapidly than synchronization occurs.