Your Question : the steps to configure crwal impact rule & when i should use it & the difference between it & crwal rule?
First thing Crawl Impact rules is :-defines the rate at which the Windows SharePoint Services Help Search service requests documents from a Web site during crawling.
Second thing : The rate can be defined either as the number of simultaneous documents requested or as the delay between requests
Third thing : In the absence of a crawler impact rule, the number of documents requested is from 5 through 16 depending on the hardware resources.
The Configuration of it:
Verify that the user account that is performing this procedure is a service application administrator for your FAST Search Content Search Service Application.
In Central Administration, in the Application Management section, click Manage service applications.
On the Service Applications page, in the list of service applications, click your FAST Search Content SSA.
On the Search Administration page, under Crawling, click Crawler Impact Rules.
Click Add Rule.
In the Site box, type the name of the site the crawl rule should apply to.
In the Request Frequency box, set the desired number of simultaneous request and/or the desired request interval.
Do not overload sites with requests. Request few documents at the same time and set a delay between requests.
or you could follow http://technet.microsoft.com/en-us/l.../ff381257.aspx
(Hint if you need more info about this topic you could search for materails about topics in( Building Enterprise Search Applications)) ---but this level in microsoft is 400.
so you should not start in this topics till you finish normal admin and development tasks
Your Question : Heath analiyzer & how to configure heath data collection
First thing Health analiyzer is : health analysis tool which enables you to check for potential configuration, performance, and usage problems.
Seond thing how it work :
* Health Analyzer runs predefined health rules against servers in the farm
* A health rule runs a test and returns a status that tells you the outcome of the test
* When any rule fails, the status is written to the Health Reports list in SharePoint Server 2010 and to the Windows Event log
* Health Analyzer also creates an alert in the Health Analyzer Reports list on the Review problems and solutions page in Central Administration
*You can click an alert to view more information about the problem and see steps to resolve the problem
*You can also open the rule that raised the alert and change its settings.
for more info you could follow http://technet.microsoft.com/en-us/l.../ee748636.aspx
Usage and Health Data Collection Service Application collects Data about Usage and Health of your farm. This information is used for Health Monitoring
The configuration of Health Data Collection
Verify that the user account performing this procedure is a member of the Farm Administrators group.
The usage and health data settings are farm-wide and cannot be set for individual servers in the farm.
In Central Administration, on the Home page, click Monitoring.
On the Monitoring page, in the Reporting section, click Configure usage and health data collection.
On the Configure usage and health data collection page, in the Usage data collectionsection, enable usage data collection by selecting the Enable usage data collectiontext box.
In the Event Selection section, select the events to log by selecting the check box next to the events in the Events to log list.
Logging uses system resources and can affect performance and disk usage. Only log those events for which you want regular reports. For ad hoc reports or investigations, enable logging for specific events, and then disable logging for the events after the report or investigation is complete.
In the Usage data collection settings section, type the path of the folder you want usage and health information to be written to in the Log file location box. The path that you specify must exist on all farm servers.
These settings are applied to all events. To set event collection settings for individual event types, you must use Windows PowerShell.
Type the maximum disk space for the logs in gigabytes (between 1 and 20 GB) in theMaximum log file size box.
In the Health data collection section, select the Enable health data collectioncheck box. To change the collection schedules, click Health Logging Schedule. A list of timer jobs that collect health data is listed. Click any of the timer jobs to change its schedule, or disable that timer job.
In the Logging Database Server section, to change the authentication used, select either the Windows authentication or SQL authentication option.
To change the Database Server and Database Name values, you must use Windows PowerShell.
or you could follow http://technet.microsoft.com/en-us/l.../ee663480.aspx