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Add or remove a crawl component (Search Server 2010)

Search Server 2010
 

Applies to: Search Server 2010

Topic Last Modified: 2014-04-09

noteNote
  • You can modify a search topology only if you selected the Server Farm installation option when you installed Microsoft Search Server 2010.

  • Microsoft Search Server 2010 Express is an entry-level enterprise search solution that has limited scalability. In Search Server 2010 Express, the topology components of each Search service application must be on one server. Although it is possible to add topology components on that server, in most cases it is not useful. For information about scalable solutions for enterprise search in Microsoft SharePoint 2010 Products, see Technical diagrams (SharePoint Server 2010).

In Search Server 2010, crawl components process crawls of content sources, propagate the resulting index files to query components, and add information about the location and crawl schedule of content sources to their associated crawl databases. Crawl components are associated with a single Search service application. You can distribute the crawl load by adding crawl components to different farm servers.

You assign a farm server to participate in crawling by creating a crawl component on that server. If you want to balance the load of servicing crawls across multiple farm servers, add crawl components to the farm and associate them with the servers that you want to crawl content.

warningWarning
Before you add or remove a crawl component, we strongly recommend that you confirm that all content sources are idle. To check whether all content sources are idle, you can go to the Search_service_application_name:Manage Content Sources page and check the value in the Status field for each content source. A value of Idle in the Status field for a content source indicates that no crawl is in progress.
If one or more content sources are not idle before you add or remove a crawl component, tables in the crawl database can become inconsistent. In this case, active crawls will not resume or stop, which will make it necessary to reset the search index and recrawl all content.
To ensure that all content sources are idle, you can wait until all crawls complete normally, or you can manually stop each crawl that is in progress. For information about how to stop a crawl, see Start, pause, resume, or stop a crawl (Search Server 2010).

  1. Verify that the user account that is performing this procedure is a member of the Farm Administrators group.

  2. In Central Administration, in the Application Management section, click Manage service applications.

  3. On the Service Applications page, click the name of the Search service application to which you want to add a crawl component.

  4. On the Search Administration page, in the Search Application Topology section, click the Modify button.

  5. On the Manage Search Topology page, click New, and then click Crawl Component.

  6. In the Add Crawl Component dialog box, in the Server list, click the farm server to which you want to add the crawl component.

  7. In the Associated Crawl Database list, click the crawl database that you want to associate with the new crawl component.

  8. In the Temporary Location of Index field, you can optionally enter the location on the server that will be used for creating the index files before propagating them to the query components. If you want to accept the default location, leave the contents of this field unchanged.

  9. Click OK to add the new crawl component to the job queue.

  10. On the Manage Search Topology page, click the Apply Topology Changes button to start the SharePoint timer job that will add the new crawl component to the farm on the specified server.

    noteNote
    You can make other changes to the Search topology and then apply them all at the same time by clicking the Apply Topology Changes button.

  1. Verify that the user account that is performing this procedure is a member of the Farm Administrators group.

  2. In Central Administration, in the Application Management section, click Manage service applications.

  3. On the Service Applications page, click the name of the Search service application to which you want to add a crawl component.

  4. On the Search Administration page, in the Search Application Topology section, click the Modify button.

  5. On the Manage Search Topology page, click the crawl component that you want to remove, and then click Delete.

  6. In the message box that appears, click OK to add the removal of the crawl component to the job queue.

  7. On the Manage Search Topology page, click the Apply Topology Changes button to start the SharePoint timer job that will delete the crawl component from the farm.

    noteNote
    You can make other changes to the Search topology and then apply them all at the same time by clicking the Apply Topology Changes button.

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