XenMotion Deep Dive Citrix XenServer 5

XenMotion – Live VM Movement XenMotion allows minimal downtime movement of VMs between physical systems

XenMotion allows minimal downtime movement of VMs between physical systems

XenMotion – Live VM Movement Generally 150-200ms of actual “downtime”

Generally 150-200ms of actual “downtime”

XenMotion – Live VM Movement Most of the downtime is related to network switch moving IP traffic to new port

Most of the downtime is related to network switch moving IP traffic to new port

XenMotion CPU Requirements XenMotion requires systems that have similar CPUs

XenMotion requires systems that have similar CPUs

XenMotion CPU Requirements Must be the same manufacturer

Must be the same manufacturer

XenMotion CPU Requirements Must be the same type

Must be the same type

XenMotion CPU Requirements Can be different speed

Can be different speed

XenMotion CPU Requirements Example Xeon 51xx series chips Could have a mix of 5130 and 5120 chips

Example Xeon 51xx series chips

Could have a mix of 5130 and 5120 chips

Pre-Copy Migration: Round 1 Systems verify correct storage and network setup on destination server Source Virtual Machine Destination

Systems verify correct storage and network setup on destination server

Pre-Copy Migration: Round 1 VM Resources Reserved on Destination Server Source Virtual Machine Destination

VM Resources Reserved on Destination Server

Pre-Copy Migration: Round 1 While source VM is still running XenServer copies over memory image to destination server

While source VM is still running XenServer copies over memory image to destination server

Pre-Copy Migration: Round 1 XenServer keeps track of any memory changes during this process

XenServer keeps track of any memory changes during this process

Pre-Copy Migration: Round 1

Pre-Copy Migration: Round 1

Pre-Copy Migration: Round 1 After first pass most of the memory image is now copied to the destination server

After first pass most of the memory image is now copied to the destination server

Pre-Copy Migration: Round 1 Any memory changes during initial memory copy are tracked

Any memory changes during initial memory copy are tracked

Pre-Copy Migration: Round 2 XenServer now does another pass at copying over changed memory

XenServer now does another pass at copying over changed memory

Pre-Copy Migration: Round 2

Pre-Copy Migration: Round 2 Xen still tracks any changes during the second memory copy

Xen still tracks any changes during the second memory copy

Pre-Copy Migration: Round 2 Second copy moves much less data

Second copy moves much less data

Pre-Copy Migration: Round 2 Also less time for memory changes to occur

Also less time for memory changes to occur

Pre-Copy Migration: Round 2

Pre-Copy Migration Xen will keep doing successive memory copies until minimal differences between source & destination

Xen will keep doing successive memory copies until minimal differences between source & destination

XenMotion: Final Source VM is paused and last bit of memory and machine state copied over

Source VM is paused and last bit of memory and machine state copied over

XenMotion: Final Master unlocks storage from source system and locks to destination system

Master unlocks storage from source system and locks to destination system

XenMotion: Final Destination VM is unpaused and attached to storage and network resources

Destination VM is unpaused and attached to storage and network resources

XenMotion: Final Source VM resources cleared

Source VM resources cleared

Resources

Resources XenServer Product Page http://www.citrix.com/xenserver XenServer Community – XenServer Blog http://community.citrix.com/blogs/group/server-virtualization/ XenServer Support Forums http://www.citrix.com/xenserver/forums/ Citrix Knowledge Center http://support.citrix.com/ Xen Community http://www.xen.org/ © 2008 Citrix Systems, Inc. — All rights reserved

XenServer Product Page

http://www.citrix.com/xenserver

XenServer Community – XenServer Blog

http://community.citrix.com/blogs/group/server-virtualization/

XenServer Support Forums

http://www.citrix.com/xenserver/forums/

Citrix Knowledge Center

http://support.citrix.com/

Xen Community

http://www.xen.org/

Next Steps Download XenServer Express Edition for free Download XenServer Enterprise Edition 30-day Trial

Download XenServer Express Edition for free

Download XenServer Enterprise Edition 30-day Trial