Active directory security log sie

The domain controller's security event logs are limited to 20 mb in size.  Our DCs are so busy that a 20 mb log holds only a day worth of logs.  I want to increase the size of the security log to a size which will hold at least 5 - 10 days of events, guessing it would be about 100 - 200 MB in size.

Will increasing the security event log size cause a performance issue?
Are there other considerations for sizing the security event log?

Could use advise how to best optimize the domain controller's event logs.

AD is Windows 2008 R2 functional level with about 3000 users.
epmmisAsked:
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David Johnson, CD, MVPOwnerCommented:
you have many options one of which is to archive after they reach the maximum size..  other than the increase in disk usage there are no ill effects of increasing the size.
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VB ITSSpecialist ConsultantCommented:
You can change the maximum log file size to your desired size by right clicking on Security in Event ViewerProperties > modify the Maximum log size (KB) value here to your desired size. As David has mentioned above, you can also configure the logs to archive the log file when it is full in this same window so that you don't lose any history.

Just keep in mind that this will eat up disk space over time so you'll need to either implement a script to clear out older logs or clear them yourself manually.
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Pramod UbheCommented:
increasing log size will not cause any performance issue it will only consume more space or the space that you configure for it.
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epmmisAuthor Commented:
Is there a best practice for retaining security logs?
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epmmisAuthor Commented:
How does the archive option work?  Where are the logs archived logs stored?
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VB ITSSpecialist ConsultantCommented:
Is there a best practice for retaining security logs?
Not really. Just retain as much data as you can easily store and analyze in a reasonable amount of time.
How does the archive option work?  Where are the logs archived logs stored?
When the log file gets full, it archives the oldest events to another file, which you can open in Event Viewer if required. The archived log file along with the default log files are located in %SystemRoot%\System32\Winevt\Logs by default.

Have a look at using Group Policy for some more fine-grained control over the retention of your log files. The settings can be found in Computer ConfigurationPoliciesWindows SettingsSecurity SettingsEvent Log
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epmmisAuthor Commented:
The size of the log file database will be increased and then archived when it gets full.
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