Google Search Appliance Configuring GSA Mirroring version 7.2 - Manual (Page 4)

Google Search Appliance: Configuring GSA Mirroring 4
Configuring GSA Mirroring
This guide contains the information you need to use GSA mirroring, a feature of the Google Search
Appliance. GSA mirroring is a feature that enables the index and other configuration information from
one search appliance, called the master node, to be replicated to another search appliance, called a
replica. You can set up either an active-active or active-passive mirroring configuration.
This document is for you if you are a search appliance administrator, network administrator, or another
person who configures search appliances or networks. You need to be familiar with the Google Search
Appliance and how to configure crawl, serve, and other features.
On the Admin Console, GSA mirroring is configured under Admin Console > GSA
n
.
Introducing GSA Mirroring
GSA mirroring is a feature that enables the index on one search appliance to be replicated to one or
more search appliances. In this release, you can set up active-active or active-passive mirroring
configurations.
• Use an active-passive configuration, in which all search queries are directed to the master search
appliance, to provide high availability serving.
• Use an active-active configuration, in which search queries are distributed between the master and
mirror search appliances, to provide high capacity serving.
For more information, see “Deciding Which Mirroring Configuration to Use” on page 7.
After GSA mirroring is enabled, all crawling is performed only by the master search appliance, limiting
the load on content servers. The remaining search appliances can serve, but do not crawl. Most
administration is performed only on the master search appliance. Configuration information and the
index are replicated to the other search appliances in the configuration. All search appliances serve
from the same index and corpus.
The search appliance also supports mirroring for a node participating in a unification configuration. For
information about how to set this up, see Configuring GSA Unification.