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Microsoft Sharepoint Products and Technologies Resource Kit eBook

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242 Part III: Planning <strong>and</strong> Deployment<br />

Table 10-4 Performance Counters for Dedicated Search Servers—Large Server Farm (continued)<br />

Object Counter Threshold Description<br />

Search<br />

catalogs<br />

Search<br />

catalogs<br />

Number of<br />

documents<br />

Queries rate_<br />

(index names or<br />

all instances)<br />

Web service Get requests per<br />

second_total, individual<br />

portal, or Windows<br />

SharePoint<br />

Portal Services site<br />

Leading Indicators for Search Servers<br />

When the percent processor time or query rate counters approach the indicated<br />

thresholds, consider adding a search server to the server farm. In addition, if the<br />

search catalog size exceeds 5 million documents, you must add a search server. As<br />

the number of documents approaches 5 million, propagation <strong>and</strong> crawling times<br />

become unacceptably long.<br />

Evaluating search performance involves more than simply monitoring the<br />

counters in Table 10-4. For more information, see the “Other Factors That Influence<br />

Search Performance” section earlier in this chapter.<br />

Scale-Out Limitations for Search Servers You can have no more than four search<br />

servers per server farm.<br />

Index Servers<br />

<strong>Microsoft</strong> has tested up to<br />

5 million documents.<br />

Indicates which indexes are<br />

most searched by users.<br />

With ongoing monitoring,<br />

trends emerge that equate<br />

requests per second with<br />

CPU consumption.<br />

This counter identifies the total<br />

number of documents in the<br />

catalog.<br />

The number of queries posted to<br />

indexes per second. In conjunction<br />

with other performance data,<br />

this counter can help determine if<br />

your index configuration can be<br />

optimized.<br />

Generally speaking, this is the<br />

rate that clients are requesting<br />

information from the front-end<br />

Web servers.<br />

Table 10-5 lists the most important counters for evaluating the performance of an<br />

index server in a large server farm.<br />

Table 10-5 Performance Counters for Index Servers—Large Server Farm<br />

Object Counter Threshold Description<br />

Processor Percent processor<br />

time_total<br />

Search indexer<br />

catalogs<br />

Search indexer<br />

catalogs<br />

Number of<br />

documents<br />

80 to 85 percent averaged<br />

over three intervals.<br />

<strong>Microsoft</strong> has tested up to<br />

5 million documents.<br />

The total percentage of processor<br />

usage for a server.<br />

The number of documents in the<br />

catalog.<br />

Index size MB 20 GB. The current size of index data in<br />

megabytes.

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