Didier Van Hoye - Technical Architect

Microsoft MVP & MEET Memberhttp://workinghardinit.wordpress.com

@workinghardinit

Live Migrate VM and Storage

to Clusters

Live Migrate VM and

Storage Between

Clusters

Live Migrate VM and Storage

to Stand-Alone Server

You can move a VM anywhere in your datacenter with zero downtime!

Client accessing VM

Live Migrate this

VM to another

physical machine

VHDX

Memory content is

copied to new server

VM pre-staged

VHDX

Pages are being

dirtied

Client continues

accessing VM

VHDX

Smaller set of

changes

Recopy of changes

VHDX

Partition State copied

VM Paused

VHDX

Old VM deleted once

migration is verified

successful

Client directed to new

host

VHDX

• Windows Server 2012 now supports the ability to do multiple live migrations in parallel

• Unlimited number of live migrations can be performed in parallel• Default configuration of 2 simultaneous LM’s per host

• Wield this power wisely• Excessive number of simultaneous migrations may actually result in overall

longer times than serially

•

•

•

•

•

Update

Coordinator

Admin

Initiate

Cluster-Aware Updating

Storage Migrate

this VHDX to

another disk

Client accessing VM

VM stays running

servicing clients

VHDX

New VHDX created

on new storage

VHDXVHDX

Writes mirrored to new

Destination VHDX

Reads are from

Source VHDX

VHDX VHDX

VHDX data copied from

Source to Destination

VHDXVHDX

Reads and Writes

transitioned to new VHDX

VHDX

• Protects from unplanned downtime:• Hardware

• Host OS

• VM

• Guest OS

• Apps in VMs

NetFT

Node 1

ClusSvc

VMMS

User

Mode

Kernel

Mode

RHS

Guest OS

VDev

NetFT

Node 2

ClusSvc

VMMS

RHS

Guest OS

VDev

vmclusres.dllvmclusres.dll

FC SAS RBOD

iSCSI FCoE

SAS JBOD

Shared Storage

RAID HBA Software

ReplicationHardware

Replication

SMB

Data Replication

Application

ReplicationSpaces

VM running on Node 2 is

unaffected

Coordination

Node

SAN Connectivity

Failure

I/O Redirected via

network

VM’s can then be live migrated to another

node with zero client downtime

VHDX

Cluster

CLUSTER CLUSTERiSCSI or FC

Guest Cluster

SAN SAN

VHDX VHDX

• Automatic and manual failover for DR

• Supports 3rd party hardware and software based replication

Hyper-V Replica• RPO = 5 minutes

• RTO = Manual (longer)

• Cost = In-box in Windows Server

• Complexity = Low

Multi-Site Clustering• RPO = 0 minutes*

• RTO = Automatic (fast)

• Cost = High

• Complexity = High

*depending on 3rd party replication solution

Systems in

lock step

Planned

Downtime

Unplanned

DowntimeDisaster Recovery