Google Search Appliance Configuring GSA Mirroring version 7.2 - Manual (Page 15)

Google Search Appliance: Configuring GSA Mirroring 15
Promoting a Replica Node to Master
Promote a replica node to the master node in a GSA mirroring configuration only when the master node
fails and is not accessible. After promotion, the new master node begins crawling where the old master
node stopped its crawl. In addition, port 19900 on the master begins to accept feeds.
If your installation includes connectors, see “Configuring Connectors with GSA Mirroring” on page 14 for
information on sending content from connectors to the new master node.
The process of promoting a search appliance from replica to master in a mirroring configuration
depends on how many nodes are in the configuration.
• When the master node in a two-node configuration fails, you disable mirroring and the replica
becomes an individual search appliance with no mirror node.
• When the master node in a three-or-more-node configuration fails, any replica can be promoted to
master. You can then re-enable mirroring with the remaining nodes.
If the master Google Search Appliance fails and a replica search appliance is promoted to be the master,
do not directly add the former master node back as the master, because this will cause problems in the
mirroring configuration. If you need to use the former master search appliance as the master, add it as
a replica of the new master first. Wait until all index and configuration data are fully synchronized with
the new master node, and then you can add the search appliance as the master again.
To promote a replica node to master when there is only one replica node in the configuration:
1. Log in to the Admin Console of the replica node.
2. Navigate to the GSA
n
> Configuration page and click Disable GSA
n
.
3. Wait approximately 15 to 30 minutes for the Crawl Diagnostics content to display.
4. Click Content Sources > Diagnostics > Crawl Status.
5. Click the Resume Crawl button. The node is configured as an individual search appliance.
To promote a replica node to master when there are two or more replica nodes:
1. Log in to the Admin Console of each replica node and perform steps 2 to 6 on each replica.
2. Click Content Sources > Diagnostics > Crawl Status.
3. Click the Pause Crawl button.
4. Navigate to the GSA
n
> Configuration page and click Disable GSA
n
.
5. Wait approximately 15 to 30 minutes.
6. Examine the Crawl Diagnostics page to see whether it is displaying indexed URL content on all
replica nodes.
7. Log in to the Admin Console of the node you are promoting to the master node.
8. Navigate to the GSA
n
> Configuration page and click Enable.
9. Configure the remaining search appliances as replica nodes.
10. On the new master node, click Content Sources > Diagnostics > Crawl Status.
11. Click the Resume Crawl button.