Greetings, In the following article:http://technet.microsoft.com/en-us/library/bb309523.aspx there is 4 parameters for sizing the recommended memory for the ACS Collector. I need to know what is the default values for paremeters "S" and "P", and I need to know what is the difference between these two parameters. Thanks for your help.

Hi, S: StringCacheSize Size of the string cache on the ACS collector, expressed by the maximum number of entries the cache can hold. On average, each queue entry consumes 512 bytes of memory. This cache is used for event record data. P: PrincipalCacheSize Size of the principal cache on the ACS collector, expressed as the maximum number of entries the cache can hold. This cache is used for data that pertains to the user and computer accounts that have access to ACS components. You can find their value under the registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AdtServer\Parameters Thanks,Yog Li -- Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, S: StringCacheSize Size of the string cache on the ACS collector, expressed by the maximum number of entries the cache can hold. On average, each queue entry consumes 512 bytes of memory. This cache is used for event record data. P: PrincipalCacheSize Size of the principal cache on the ACS collector, expressed as the maximum number of entries the cache can hold. This cache is used for data that pertains to the user and computer accounts that have access to ACS components. You can find their value under the registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AdtServer\Parameters Thanks,Yog Li -- Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

P: PrincipalCacheSize Size of the principal cache on the ACS collector, expressed as the maximum number of entries the cache can hold. This cache is used for data that pertains to the user and computer accounts that have access to ACS components. Thanks Yog Li for your response. What's the meaning of "data that pertains to the user and computer accounts that have access to ACS components"? Is this data the name of computers with ACS enabled in their SCOM agents? Is this data the name of user accounts of Operations Manager Administrators Role users that manage ACS? Is this data the name of user accounts and computer accounts that are mentioned in the security log events description? Thanks.