Virtualization - an introduction Gordon Ross Computing Service.

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Presentation transcript:

Virtualization - an introduction Gordon Ross Computing Service

What is virtualization ? “The simulation of the software and/or hardware upon which other software runs.”

3 Why virtualization ? Obsolete hardware/software Consolidation/Efficiency Easier Management Availability Online Hardware Upgrade Test/Dev/Proof-of-Concept 3

4 Why not virtualize ? Cost Hardware Software Complexity Speed Availability Licensing 4

5 Key Terms Virtualisation Software Hypervisor Guests Host

6 Types of virtualization Full Virtualization Guest operating system runs unmodified Para-virtualization Requires guest operating system modification Containers Can only run guests using the same kernel Guest isolation... 6

7 Virtualization Methods Emulation Type 2 Type 1 Hardware assisted 7

8 Virtualization Software VMWare Xen Hyper-V KVM Domains/Containers Desktop (Workstation, Parallels, VirtualBox, Virtual PC, XP Mode) 8

9 VM Migration

10 VM Migration - Requirements Network Shared Storage iSCSI, NFS, FC or not ! CPU Compatibility AMD/Intel, AMD-V/VT, Windows HAL Management System Money... 10

11 High Availability Virtualization VM Crashes Server Outages Load Balancing 11

12 Virtual Machine Management Backups Snapshots Templates & Clones But don’t get trigger happy... Resource Management O/S & Data separation 12

13 Gotchas Time Network MAC Addresses Batch Jobs Patching Management Software DNS & Windows Domains Disc 13