How to size an Active Directory domain controller in Windows.Ever since Windows 2.By submitting your personal information, you agree that Tech.Active Session Limit Windows 2008 Disk' title='Active Session Limit Windows 2008 Disk' />Target and its partners may contact you regarding relevant content, products and special offers.You also agree that your personal information may be transferred and processed in the United States, and that you have read and agree to the Terms of Use and the Privacy Policy.Sizing a server typically refers to the number of processors, physical memory, disk space and the applications that the server will host. Information Security And Ethical Hacking Course In Chennai Corporation . The problem with sizing a domain controller DC is that the load is so variable.DCs handle authentication via the Lsass.In addition, processor resources are consumed by database operations on the Ntds.As such, the DC load can be inconsistent for the following reasons The number of authenticated clients is unpredictable since multiple DCs share the load for clients in and out of the site.Applications that perform authentication and Lightweight Directory Access Protocol LDAP queries put additional weight on the DC.Authentication and access to Windows resources by non Windows clients increase the DC load with LDAP queries.Inefficient LDAP queries can put an unpredictable load on the DC.Active Directory AD analysis and monitoring tools put additional load on the DC.Software requirements.The following AD FS requirements are for the server functionality that is built into the Windows Server 2012 R2 operating system.Preparing disk for import job.To prepare drives for an import job, call the WAImportExport tool with the PrepImport command.Which parameters you include depends on.Kyle, Would this work for Windows 2008 R2 Enterprise Edition We have a server with a single 4TB C drive that contains the OS.The server is DC, RDP, DNS, DHCP and.B3.png' alt='Active Session Limit Windows 2008 Disk' title='Active Session Limit Windows 2008 Disk' />While these factors make it more challenging to size a DC, its still possible.The key is to measure actual performance and determine the load and required resources.Ive worked with a number of administrators whose DCs were not up to the task of handling their business.Using some fairly straightforward Perfmon analysis, however, I was able to relieve the pressure on the DCs that were affecting logon performance.Working backwards, I can determine sizing.Lsass. exe. Lsass.DC performance issues in Windows 2.R2, and is responsible for all the authentication activity on a DC.In order to tackle performance issues, Lsass.CPU and memory resources and leaves a detailed memory footprint.The ultimate goal here is to get enough RAM to put the entire Ntds.LDAP queries. To begin, its important to make sure all DCs are installed on x.Anything smaller wont allow Lsass.Determining memory size starts by calculating the Ntds.Perfmon analysis.To do this, simply look at the Ntds.Task Manager to see the memory consumption by Lsass.Note that the Ntds.DC, but the LDAP load may vary per site.Processor sizing.Active Directory processors are also important to calculating domain controller memory size and are linked to AD Jet database session operations.Windows Server 2.R2 actually has a registry key to control these sessions, but they need to be managed cautiously.The more processors in the mix, the more Jet database sessions available.But running out of Jet sessions can cause a variety of events indicating insufficient AD resources.To avoid this, start out with at least four processors.Disk space. Disk space is fairly simple to manage and follows general disk performance rules.Remember to use high performance disks and put the logs and SYSVOL folder on a separate disk spindle from the Ntds.The size of Ntds.SYSVOL folder will be the big hitters for disk space, unless other applications are being hosted on the DC.Performance analysis.By running a Perfmon analysis, admins can determine the load on memory, processors and disk space, as well as the performance of an existing DC preferably on an x.Just use the standard counters memory, processor, disk, network, etc., but add NTDS counters and the Lsass.DC. Run it for at least 4.Once the analysis is complete, evaluate the Lsass.CPU and memory usage.Compare that usage to available memory to determine if the memory usage follows Lsass.Figure 1 shows an increase in available memory in the early morning hours at the same that there is a spike in LDAP bind time see Figure 2.Figure 1 Available memory.Figure 2 LDAP bind time.According to the Perfmon analysis, the LDAP bind time spike is not associated with a decrease in available memory.Therefore, the data needs to be captured over a longer period of time.Note For LDAP bind time, look for sustained periods of 1.PAL will flag warning and error levels.Its best to have a baseline to compare to for CPU analysis, but if there isnt, best practice is to make sure CPU usage is not above 8.Also look for dominance by Lsass.If the system isnt handling the load efficiently, add memory or processors as required.While there is no magic spreadsheet or tool, understanding how to analyze Lsass.Active Directory domain controllers.You can follow Search.Windows. Server. com on Twitter Windows.TT. ABOUT THE AUTHORGary Olsen is a Solution Architect in Hewlett Packards Technology Services organization and lives in Roswell, GA.Gary has worked in the IT industry since 1.MS in Computer Aided Manufacturing from Brigham Young University.Gary has authored numerous technical articles for Tech.Target, Redmond Magazine and Tech.Net magazine, and has presented numerous times at the HP Technology Forum.Gary is a Microsoft MVP for Directory Services and is the founder and president of the Atlanta Active Directory Users Group.
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