Enterprise TechSQLBest Practices for Running SQL Server with Hyper-V Dynamic Memory June 9, 20168800 views0Share By IG ShareTable of ContentsNote: If you buy something from our links, we might earn a commission. See our disclosure statement. Best Practices for Running SQL Server with Hyper-V Dynamic MemoryHow Hyper V does Dynamic memory assignmentUse Maximum and Minimum MemoryUse Lock Pages in MemoryStart-up Memory is KeyBest Practices for Running SQL Server with Hyper-V Dynamic MemoryMicrosoft recommends to disable Dynamic Memory for virtual machines running SQL Server. This is applicable to both VMware as well as Hyper V. Memory is a critical resource for SQL Server and any resource crunches can cause a negative impact to SQL Server workloads. In short, any shared resources is a strict No, be it CPU, Memory, Disks or Networks. However, in some scenarios customers might run SQL Server with Dynamic Memory enabled to save costs and efficiently manage data-centre resources. In this post, I am going to talk about best practices for running SQL Server with Hyper-V Dynamic Memory.Also read: Best Practices for Running SQL Server in Virtual MachinesHere are the key concepts that needs to be understood.Start-up Memory: The memory assigned to the Virtual Machine when it starts up.Memory Demand: Hyper V Dynamic memory estimated how much memory is required by SQL Server or any other Applications.Memory Buffer: This is the memory assigned on top of “Memory Demand” to meet any immediate system memory requirements.Maximum Memory: The maximum memory that can be allocated to the Virtual Machine.Host Memory Reserve: The memory reserved by the Host OS to effectually run its resources including Hyper V and other server roles.Minimum memory Reserve calculated as follows:Host Reserve = 384 MB + 30 MB per GB memory of the hostIf your start-up memory is 1024 mb, then the maximum buffer pool size of SQL Server will be 16 GB (16000 mb)How Hyper V does Dynamic memory assignmentVirtual Machine Memory = Memory Demand + (Memory Demand * Memory Buffer Percentage)The Technique of Adding memory dynamically to Hyper V Guest OS’s is similar to the “Hot Add CPU” feature.Use Maximum and Minimum MemoryUsing this option you can pre-allocate memory to SQL Server at instance start-up and force the “Memory Demand” to meet the usage requirements.Use Lock Pages in MemoryOnce this option is selected, Windows will not be able to page-out the memory assigned to SQL Server.Start-up Memory is KeyYou need to assign at-least 2 GB of initial Start-up memory and Maximum memory of 12 GB can give you better throughputs in shared memory scenarios.Read the Official Documentation from Microsoft here.Download the SQL Technical Article here. Affiliate Disclosure: Faceofit.com is a participant in the Amazon Services LLC Associates Program. As an Amazon Associate we earn from qualifying purchases. Share What's your reaction? Excited 1 Happy 0 In Love 0 Not Sure 0 Silly 0
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