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Version: 4.0.0

Advanced Failover Modes

Cached Configuration Advanced Mode​

In some cases, you cannot pre-sync configuration data from one cluster to the DR site because this exposes data at the DR location. In these situations, you need to cache all configuration data on the Eyeglass appliance instead of pre-syncing it to the DR cluster.

Eyeglass maintains a database of changes, but it is not used for failover operations because the information can be stale during planned failovers. A failover mode allows Eyeglass to sync configuration data to files that are used in all failover modes, both controlled and uncontrolled.

The process works as follows:

  1. Sync Configuration Changes: Every five minutes, Eyeglass syncs configuration changes and updates local files on the Eyeglass appliance.

  2. Read from Cache During Failover: During controlled and uncontrolled failovers, Eyeglass reads from cache files only and does not communicate with the source cluster to create shares, exports, or quotas on the target DR cluster.

  3. Use Potentially Stale Data: In controlled failovers, this means that potentially stale data is used to perform the failover.

How to Enable Cached Configuration Advanced Mode​

  1. Access Eyeglass via SSH: SSH into Eyeglass as the admin user.


  2. Set Read-from-File Mode: Run the command: igls adv failovermode set --readfromfile=true


  3. Complete the Setup: The setup is complete.