Enabling Disaster Recovery for Hyper-V Workloads Using Hyper-V ReplicaShreesh DubeyPrincipal Group Program ManagerMicrosoft Corporation

VIR302

Average # of outages per year ? A. 1B. 3C. 6D. 25

Average # of outages per year ? A. 1B. 3C. 6D. 25

Downtime cost per day ?A. $500B. $3,850C. $7,750D. $12,500

Average # of outages per year ? A. 1B. 3C. 6D. 25

Downtime cost per day ?A. $500B. $3,850C. $7,750D. $12,500

Average # of outages per year ? A. 1B. 3C. 6D. 25

Downtime cost per day ?A. $500B. $3,850C. $7,750D. $12,500 x 6 = $75,000!

% of SMB respondents who DO NOT have a Disaster Recovery plan?

A. 10B. 15C. 25D. 50

% of SMB respondents who DO NOT have a Disaster Recovery plan?

A. 10B. 15C. 25D. 50!

Those 50% of SMB Disaster Recovery plan is…

Session Objectives and Takeaways

Relevance and Overview of Hyper-V Replica Capabilities and Value PropositionDeployment Considerations

Relevance of Hyper-V Replica

Hyper-V Replica:Availability across datacenter

Site A Site B

Hyper-V & Failover Clustering: Availability within datacenter

Overview of Hyper-V Replica

Affordable

Easy to manage

Flexible

Inbox Replication DR Scenarios

Application Agnostic Storage Agnostic

Flexible Deployment

Head Office

Branch Office

Replication between two data centersReplication between SMB to hoster

Hoster’s Data Center

Customer 1 Customer 2

demo

Replication Capabilities

Asynchronous Replication

Primary Host

Primary VM

Log File

Log File

Replica Host

Replica VM

Resiliency from FailuresRetry and resume semanticsResynchronization

Seamless handling of VM MobilityNo admin intervention requiredLive Migration, Storage Migration and Quick MigrationWithin cluster and across cluster

Replication Resiliency

Site A

Site B

VM Mobility

Pre-requisites: Primary migration: All primary servers must be authorizedReplica migration: Requires Hyper-V Replica Broker

DR Scenarios

Testing DR plan Site Maintenance

Impending Disaster Sudden Disaster

1. Shutdown primary VM2. Send last log3. Failover Replica VM4. Reverse replicate

Testing DR or site maintenance or impending disasterZero data loss but some downtime Efficient reverse replication

Site A

Site B

Planned Failover

Ongoing replication

Network Configuration on Replica

VM Connectivity on ReplicaVswitch creation and assignmentVLAN tagging

VM identity in a different subnetInject static IP address Auto assignment via DHCP Preserve IP address via Network Virtualization

VM Name ResolutionUpdate DNS records to reflect new IP address

Primary 10.22.100.

XX15.25.10.X

X

Client

Replica

Server Name IP Address

SQLVM 10.22.100.XX

Server Name IP Address

SQLVM 15.25.10.XX

demo

Planned Failover

Test Failover

Non-disruptive testing of workload – zero downtimeTest any recovery pointPre-configure isolated network

Site A

Site B

Test Failover Demo Setup

Primary Server

AD

Exchange

Outlook

Replica AD

Replica Exchang

e

Replica Outlook

ProductionNetwork

ReplicaServer

Test AD

Test Exchang

e

Test Outlook

Test Network

demo

Test Failover

Deployment Considerations

Deployments Customer Segment

Storage Workloads

Hyper-V Replica

SMBHoster

Enterprise

0.5 GB 1 GB 3 GB 5 GB 7 GB 8 GB 10 GB0

2

4

6

8

10

12

14

Uncompressed data transferred in 24 hrs

Avg

. R

ep

licati

on

Late

ncy (

min

s)

512 Kbps, 20ms latency, 1% packet loss 768 Kbps, 20ms la-

tency, 1% packet loss 1.5Mbps, 20ms

latency, 1% packet loss

Network CapacityCapacity planning is criticalEstimate rate of data changeEstimate for peak usage and effective network bandwidth

Network ThrottlingUse Windows Server 2012 QoS to throttle replication traffic

Throttling based on the destination subnet

New-NetQosPolicy “Replication Traffic to 10.0.0.0/8” –DestinationAddress 10.0.0.0/8 –MinBandwidthWeightAction 40

Throttling based on the destination port

New-NetQosPolicy “Replication Traffic to 8080” –DestinationPort 8080 –ThrottleRateActionBytesPerSecond 100000

Network Utilization

Replicating multiple VMs in parallelHigher concurrency leads to resource contention and latencyLower concurrency leads to underutilizing

Manage initial replication through schedulingManage delta replication

Network bandwidth Ideal number of parallel transfers

1.5 Mbps, 100ms, 1% packet loss

3 (Default)

300 Mbps, 10ms, 1% packet loss 10

Backup copy to seed Initial ReplicationBack-up Primary VM

Concurrent backup and replication are handled seamlesslyRestore of Primary VM requires resync

Back-up Replica VMReplica VM turned offBackup is on hold when VHD is modified by replicationRestore of replica VM requires resync

Backup Interoperability

Impact on primary serverStorage space: Proportional to writes in the VMStorage IOPS on ~ 1.5 times write IOPS

Impact on replica serverStorage space: Proportional to the write-churn

Each additional recovery point ~10% of the base VHD size

Storage IOPS: 0.6 times write IOPS to receive and convert

3-5 times write IOPS to receive, apply, merge for additional recovery points

Memory ~50MB per replicating VHD CPU impact <3%

Server Impact

demo

Customer Example

In Review: Session Objectives and Takeaways

Relevance of Hyper-V Replica and when to use itComplements high availability and migration

Capabilities and Value PropositionInbox solutionFlexible deployment scenariosComprehensive replication and failover capabilities

Deployment ConsiderationsNetworkSystem ImpactBack-up Inter-op

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