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Windows Server 2008 R2 SP1 : Dynamic Memory

Windows Server 2008 R2 SP1 : Dynamic Memory. Kurt Roggen [BE] Blog: http://TryCatch.be/blogs/roggenk Blog: http://SCUG.be/blogs/SCVMM. Agenda. Overview Hyper-V & Dynamic Memory Startup RAM, Maximum RAM Memory Buffer, Memory Weight Root Reserve SCVMM & Dynamic Memory.

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Windows Server 2008 R2 SP1 : Dynamic Memory

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  1. Windows Server 2008 R2 SP1:Dynamic Memory Kurt Roggen [BE] Blog: http://TryCatch.be/blogs/roggenk Blog: http://SCUG.be/blogs/SCVMM

  2. Agenda • Overview • Hyper-V & Dynamic Memory • Startup RAM, Maximum RAM • Memory Buffer, Memory Weight • Root Reserve • SCVMM & Dynamic Memory

  3. Virtualization Enhancements in Service Pack 1 RemoteFX Dynamic Memory Leverages the power of virtualized graphics resources and advanced codecs to achieve high fidelity.Enables “local-like” experience for a hosted desktop Allocate range of memory per VM & dynamically adjust memory usage on demand.Consistent performance & Better Manageability

  4. Virtual Memory (vRAM) - Static • Fully allocated at run-time • Up to 64 GB per VM • Can only adjust vRAM when VM is offline

  5. Dynamic Memory: What? “Dynamic Memory enables the system to dynamically adjust virtual machine memory usage based on demand”

  6. Dynamic Memory: What NOT! • Is not Overcommit • Is not Page Sharing • Is not Second Level Paging

  7. Dynamic Memory: Advantages • Real time sizing based on memory demand • Based on performance counters inside VM • Usable for both server and desktop workloads • Higher VM consolidation ratios per host • Windows 7 SP1 allows 12:1 ratio (vCPU:lCPU)

  8. Dynamic Memory: Process • Allocate memory from Hyper-V host memory pool • VM gets memory from memory pool • As long as pool is not empty • Based on memory demand/workload • VM gets memory from other VMs • If memory pool is empty • Based on Memory Priority/Weight • VM releases memory to memory pool VM5 Host Memory Pool VM4 VM3 VM2 VM1

  9. Virtual Memory (vRAM) - Dynamic • Only ‘Startup RAM’ allocated at run-time • Up to 64 GB per VM • Can only adjust vRAM when VM is offline • Windows Server 2008 R2 SP1 feature

  10. Startup RAM & Maximum RAM • Startup RAM • Minimum amount of memory to boot VM • Guaranteed lower memory boundary • Default: 512 MB • Maximum RAM • Limit amount of memory • Default: 64 GB

  11. Memory Sizing • Controlling Memory Availability • How much memory does the VM have? • How much memory does the VM want? • The difference is the availability • Mechanisms in place to control memory • Availability through Memory Buffer and Memory Weight settings

  12. MemoryBuffer • How much “free” memory should we keep in the VM? • Allows for responsiveness to ‘bursty’ workloads • Can be used for file cache “I like to configure my virtual machines so that they have ~20% free memory” • Default: 20%

  13. Put it together Maximum Memory 64 GB Host Memory Pool Memory Demand * Configured Buffer Percentage MemoryBuffer Memory Buffer = 20 % Workload MinimumMemory Memory Demand 512 MB Startup Memory Startup Memory

  14. Memory Priority/Weight • Which VM gets the memory first, when pool is empty • Default: 5,000(1-10,000) • The higher the weight, the higher the availability/priority of memory

  15. Adding/Removing Dynamic Memory • Adding Memory • Immediately when VM needs it (on demand) • Enlightened fashion • Synthetic Memory Driver (VSP/VSC Pair) • No hardware emulation • Light weight • Removing Memory • Unutilized memory is collected every 5 minutes • Wanted to remove memory • Ballooning is more efficient

  16. Dynamic Memory Architecture OS Microsoft Hyper-V Dynamic Memory Components Guest Applications VMWP DM VDEV/VSP User Mode Memory Balancer Interface VMMS Memory Balancer GMO Memory Manager Windows Kernel Windows Kernel Kernel Mode DM VSC VID VMBus VMBus Hypervisor

  17. Supporting Guest OS • Server OS • Windows Server 2003, 2008 & 2008 R2 • Any edition (Web, Standard, Enterprise, Datacenter) • 32-bit & 64-bit versions • Desktop OS • Windows Vista and Windows 7 • Only Enterprise and Ultimate editions • 32-bit & 64-bit versions

  18. System OS Requirements • Host OS Requirements: • Hyper-V SP1 • Guest OS Requirements: • Depends on Guest OS & OS Edition: • Integration Components (IC) and/or • QFE and/or • SP1

  19. System OS Requirements • Host OS Requirements: • Windows Server 2008 R2 SP1 • Microsoft Hyper-V Server 2008 R2 SP1 • Guest OS Requirements: • Windows Server 2003: SP2 + IC • Windows Server 2008: IC • Web/Standard: SP2 + QFE 2230887 • Windows Server 2008 R2: IC • Web/Standard: SP1 • Windows Vista: IC • Windows 7: IC

  20. Root Reserve • Hyper-V has always had the concept of a reserve of memory that is kept for the parent partition • Dynamic Memory allows VMs to push up against the reserve consistently (empty pool) • New behavior to better protect the parent partition from being starved by virtual machines • Since SP1: Host Reserve is auto-calculated based on: • If the machine SLAT capability • Total size of host RAM • NUMA architecture Memory utilized by VMs Host Reserve VM overhead VM Reserve

  21. Dynamic Root Reserve • Dynamic algorithm to determine Root Memory Reserve • Since SP1: Host Reserve is auto-calculated based on: • If the machine SLAT capability • Total size of host RAM • NUMA architecture • Algorithm: 384 MB + 30 MB per GB of host (SLAT capable) • Example: 16 GB Hyper-V Host: 384 + 16*30 = 864 MB • Does not take into account running agents • Virtualization Management (SCVMM) • Software & Patch Management (SCCM) • Monitoring (SCOM) • Backup (SCDPM) • Hardware Agents (Server, Storage, ...) • Anti-Virus

  22. Static Root Reserve • Overridealgorithm to determine Root Memory Reserve • Override using new registry key ‘MemoryReserve’ ‘HKLM\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Virtualization’ • Allows to reserve memory for the parent partition (REG_DWORD in MB) • May result in less memory being available for VMs

  23. RSAT for Windows 7 SP1 • Remote Server Administration Tools (RSAT) • OOB download at http://download.microsoft.com • KB 958830 • Includes latest Hyper-V Manager console to support • Dynamic Memory • RemoteFX

  24. Hyper-V BPA Update • Hyper-V Best Practices Analyzer • Addon to Server Manager • OOB download at http://download.microsoft.com • KB 2485986 • Also supports Dynamic Memory

  25. DM & SQL Server • Only certain editions of SQL Server are aware of dynamically changing system memory. • SQL Server 2005 Enterprise • SQL Server 2008 Enterprise / Datacenter Editions • SQL Server 2008 R2 Enterprise / Datacenter Editions • Support for Guest Clustering

  26. DM & Exchange Server • Most roles are candidates for virtualisation • HUB • CAS • Edge • Mailbox • No support for Dynamic Memory

  27. SCVMM 2008 R2 SP1

  28. SCVMM 2008 R2 SP1 (v2.0.4521) • Adds support for key Hyper-V R2 SP1 features • Configuration support (VM, Templates, HW Profiles, Live Migration, …) • Intelligent Placement support • Dynamic Memory • Startup Memory, Maximum Memory • Memory Priority, Memory Buffer • Updated VMM PRO Packs (SCOM integration) • RemoteFX • Maximum number of monitors • Maximum monitor resolution

  29. Dynamic Memory: Configuration Settings

  30. VMM PRO Tips – In the Box • SCVMM & SCOM Integration • Using PRO-enabled SCOM management packs • Deliver PRO Tips • “HostPerformance” (Hyper-V and VMware) • CPU and Memory • VMM 2008 (CPU: 90+%, RAM: 75+%) • VMM 2008 R2 (CPU/RAM: 100% - Host Reserve CPU/RAM) • “VMRight Sizing” • CPU and Memory (CPU: 90+%, RAM: 90+%) • Support for Dynamic Memory

  31. Updated VMM PRO Packs • VMM PRO management packs for “VM Right Sizing” • Located in AMD64\VirtualizationMP

  32. SCVMM 2008 R2 SP1 Upgrade Process • Update SCVMM Server (& Database) • Update SCOM Server (import new PRO MPs) • Update SCVMM Agents • VM Hosts • Library Servers • Self-Service Portal web servers • Update admin workstations • SCVMM Administrator Console For more information: System Center TechCenter

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