When planning the capacity for your SharePoint 2010 Farm, don’t forget about the size of your Search databases. SharePoint 2010 Search leverages three distinct databases, with very separate roles as follows:
- Search Administration Database
- Crawl Database
- Property Database
Per TechNet, the recommendations are as follows:
|Size estimation recommendation|
|Search requires three databases. Your environment may include multiple Property and Crawl databases.The Search administration database is typically small: allocate 10 GB.To estimate the required storage for your Property and Crawl databases, use the following multipliers:
The IOPS requirements for Search are significant.
For detailed information about how to estimate capacity required for Search, see Performance and capacity test results and recommendations (SharePoint Server 2010).
Source: TechNet – http://technet.microsoft.com/en-us/library/cc298801.aspx#section1c