Reference This security policy reference topic for the IT professional describes the best practices, location, values, policy management, and security considerations for this policy setting. For Windows Server 2012 Hyper-V and Windows Server 2012 R2 Hyper-V, the page file of the management OS (commonly called the host OS) should be left at the default of setting of "System Managed." For Hyper-V only host servers, set the page file to 8GB (unless you want a full memory dump on crash, then set it to 1x RAM). But in this case, it ultimately caused this server to fail to allocate memory, even though the system had plenty of free space on the C: drive. For example, if the server had 1 GB RAM, the virtual memory size would be approximately 1.5 GB ("approximately" because Windows adjusts the virtual memory size as needed, and there are other factors that affect virtual memory size as well). Since Hyper-V won’t be using that and you probably have a lot more physical RAM in your hypervisor host than you would in a typical server computer, the page file is probably a lot larger than it needs to be. If your VM is heavily writing to the page file, you either need to add memory, or there is an application that is poorly written, and disabling the page file isn't going to prevent those issues. Despite this, Hyper-V allocates page file space at installation time the same way that a Windows Server 2008 R2 installation would, which is usually at a 1:1 ratio with RAM. It will almost always be 1x RAM. Page file best practices By default, Windows reserves an amount of space for the server's virtual memory that is one and a half times the size of the machine's physical RAM. I leave the page file at Windows default size and settings on all production servers (except for an SSAS server that is experiencing memory pressure). This is per the Hyper-V product group. Windows will always use the page file however, regardless of the amount of physical RAM. I can't think of a valid reason to disable the page file in a Windows server at all. Applies To: Windows Vista, Windows Server 2008, Windows 7, Windows 8.1, Windows Server 2008 R2, Windows Server 2012 R2, Windows Server 2012, Windows 8. This can certainly help if the page file is used frequently. A common practice is to set the page file to a maximum size to prevent page file fragmentation. A page file 1.5*RAM was the norm back in the days when you were lucky to have a SQL Server with 3 or 4 GB of RAM. The Information Security Office has distilled the CIS lists down to the most critical steps for your systems, with a particular focus on configuration issues that are unique to the computing environment at The University of Texas at Austin. Windows Server 2012 R2 Hardening Checklist The hardening checklists are based on the comprehensive checklists produced by CIS. The page file is located on the boot partition (or volume) by default, represented with the C:\pagefile.sys file. After a clean install the initial size of the file varies with the amount of physical RAM in the server. For large amount of RAM, the page file should be the same size as RAM. This is not the case any more. I don't know who published that "best practice", but they are factually incorrect for the reasons stated above. For Server 2008 and 2008 R2: For "normal" servers let Windows manage the page file.


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