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Making the Virtualization Decision

Making the Virtualization Decision. Agenda. The Virtualization Umbrella Server Virtualization Architectures The Players Getting Started. What is Virtualization?. The act of abstracting the physical boundaries of a technology. The Virtualization Umbrella. Server Virtualization.

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Making the Virtualization Decision

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  1. Making the Virtualization Decision

  2. Agenda • The Virtualization Umbrella • Server Virtualization Architectures • The Players • Getting Started

  3. What is Virtualization? The act of abstracting the physical boundaries of a technology.

  4. The Virtualization Umbrella Server Virtualization Network Virtualization Clustering Storage Virtualization

  5. Network Virtualization • Emerging Technology • Cisco (Network-Based) • The efficient utilization of network resources through logical segmentation of a single physical network. • Generic Routing Encapsulation (GRE) • Virtual Routing and Forwarding (VRF) • Multi-protocol Label Switching (MPLS) VPNs • Single Physical Network -- multiple closed logical groups

  6. Network Virtualization • Sun Crossbow (Host-Based) • Physical NIC divided into multiple virtual NICs • Bandwidth resource control and virtualization included in the network stack • Bandwidth and priority dynamically assigned to services (FTP, SMB, etc) or Virtual Machines

  7. Storage Virtualization • Host-Based • RAID • Network-Based • In-band • Virtualization appliance resides directly in the data path • Commonly associated with SANs • Cisco, IBM, EMC, Pillar • Out-of-band • Virtualization appliance resides outside of the data path • DFS, Global Namespace

  8. In-band Virtualization • Physical storage resources translated into virtual resources • Replication • Data Management • Combined with server virtualization Virtualization Appliance

  9. Distributed File Systems • Abstract the physical storage location from the data path \\mercury\sales DFS RootPublic Marketing Engineering Sales \\venus\engineering \\mars\marketing

  10. Clustering • Applications run within virtual servers that reside on one or more physical host systems. • Common Implementations: • Failover Clusters • Load Balanced Clusters • Shared Data Clusters

  11. Virtual Server Failover Clustering Shared Storage Physical Node Physical Node Switch (to public LAN)

  12. Server Virtualization • Host systems, such as servers are virtualized • Servers run as virtual machines

  13. Virtual Machines • VM = Independent OS running on top of another OS • Host = System running the Virtualization software • Run several logical servers on one physical system • Decommission older, slower systems • Supports server consolidation • Managed exactly the same as physical systems • Emulates all system hardware • AMD and Intel are changing this

  14. Why Virtualize? • Consolidate Physical Resources • Logical resources may remain the same! • Reduce Power Consumption • Streamline System Recovery • Optimize Resource Utilization • Testing and Development • Training

  15. Server Virtualization Architectures • Host-Based Server Virtualization • Commonly known as “Server Virtualization” • VMware, Microsoft, Xen • OS Virtualization • Swsoft Virtuozzo, Solaris Containers

  16. Host-Based Server Virtualization • Virtual Machine Monitor • Coordinates physical hardware access betweenVMs • Host OS/Hypervisor • Communicates with VMM • Runs server virtualization application

  17. VM Components • Virtual Hardware • Includes RAM, CPU, motherboard and network cards • Virtual Storage • Mapped to physical resource or exist as virtual disk file • .vmx = configuration • .vmdk = virtual hard disk

  18. Host-Based Architectures • Full Virtualization • Everything emulated • Fully portable VMs • Large hit on network, disk I/O, added CPU overhead • Paravirtualization • OS kernel modified to make it hypervisor-aware • Solves problem of CPU overhead • Hardware-assisted Virtualization • Fueled by AMD and Intel • System hardware is aware of virtualization hypervisor

  19. OS Virtualization • Isolation provided at the process level • OS caps placed on individual processesand system resources • Each instance is a “Virtual Environment” (AKA Virtual Private Server or Container) • No added OS overhead (Memory, Disk per VM) • No emulation = No I/O overhead • Excellent track record in web serving • Limited OS support, all VEs on 1 box must use the same OS

  20. The Players -- Server Virtualization • VMware • ESX Server, Virtual Infrastructure 3 • VMware Server • Microsoft • Windows Server Virtualization Service (coming in Windows Server 2008) • Virtual Server 2005 • Xen • XenSource, Virtual Iron, Novell, Red Hat

  21. The Players – OS Virtualization • SWsoft • Virtuozzo • Linux, Windows • Sun • Solaris Containers • HP • Virtual Server Environment (VSE) • IBM • Virtual Partition Manager

  22. Benefits • Power and Hardware Savings • Logical Resource Consolidation • Fewer physical boxes, same or more logical resources • Potential for more single points of failure • Server Portability • Host hardware may not matter • Limitations on pass-through device access needed to ensure portability • Application Failover • Apps that do not natively support clustering can failover as part of a VM

  23. Challenges • Server Selection • Management • Performance • Network & Storage Integration • Backup Complexity

  24. Eliminating Servers • “I want to consolidate 15 to 1!” • “Let’s put the servers that start with A-G on this box, H-S on this box…”

  25. Management • Centralized management, monitoring • VM sprawl • Centralized hypervisor management • Still an OS… still needs updates! • IHVs is developing tools to centrally manage multiple different server virtualized Apps.

  26. Performance • Vastly improved with Hardware-assisted or paravirtualization • Consolidation introduces potential for more bottlenecks • Host disk • Host network • Vendors improving this • Improvements from Intel and AMD • Paravirtualized or synthetic device drivers

  27. Network and Storage Integration • Existing devices may not be supported • Varies by vendor • Some products don’t have ability to add third party drivers • Disk bottlenecks easy possibility • Virtual switch management • 802.1Q support? • Who owns it?

  28. Backup Complexity • Host backup required for VM configuration files • VM Backup • Agent based is still the safest • Centralized backup on the rise • VMware VCB • Microsoft Shadow Copies • Limitations on both OS/application • May not be enough host I/O (disk, network) to support previous backup window

  29. To Virtualize or Not To Virtualize • Many choices for many problems • Storage • Network • Server • Host

  30. Virtualizing Storage • More efficient utilization of storage resources • Simplifies administration • Provides additional methods for data protection • Better Server virtualization flexibility • Considerations: • Integration with existing hardware platforms and operating systems • Integration with existing data protection/backup products

  31. Virtualizing Servers • Average server 10-15% CPU utilization • Consolidating to VMs on few servers = Better efficiency & less space • Client workstation provisioning • VMware ACE • Secure VPN-connected workstations

  32. Summary • Over Plan • Ensure Infrastructure Compatibility • Storage/SAN • Network • OS/application • Backup • Start Slow • For mission critical applications, VM failover support is key

  33. Questions? Andrew Kutz akutz@burtongroup.com

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