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High Availability in a Virtualised World

Mark AdamsDistribution Manager UK&I

Leaders Have Vision™ visionsolutions.com 2

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WHO IS DOUBLE-TAKE SOFTWARE?

Since 2010 part of VISION SOLUTIONSFounded 1991 as NSI SoftwareHQ in Irvine, CaliforniaFocused on- High Availability- Disaster Recovery- Server Migration- Systems Management

Worldwide 700 Employees (80 EMEA)20.000 Customer with 190.000 InstallationsPartnership with Microsoft, VMware, Dell, HP...24/7 Support

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Leaders Have Vision and Vision Has Leaders

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Virtualisation and Availability

• Virtualisation Benefits.......

• Virtualisation brings its own availability tools • But virtualisation could be its own worst enemy

when it comes to availability

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VMware tools

• the VMotion® and Storage VMotion functionality in vSphere makes it possible for organisations to dramatically reduce planned downtime

• VMware HA provides rapid recovery from outages– shared storage is a single point of failure– local availability only

• VMware fault tolerance provides continuous availability– shared storage is a single point of failure– local availability only

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Hyper-V tools

• Hyper-V™ live migration allows you to move running VMs from one Hyper-V™ physical host to another

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Hyper-V tools

• failover clustering at the Hyper-V host level– shared storage is a single point of failure– local availability only

• clustering at the Hyper-V guest level– shared storage is a single point of failure– local availability only

• clustering at the Hyper-V guest level on a single physical server– Physical server is a single point of failure– shared storage is a single point of failure– local availability only

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Virtualisation disadvantage?Some HA techniques and technologies, however,

outstrip the capabilities of virtualisation platforms

• what do you do if you run more than one hypervisor?

• how do you protect a mixed Physical and Virtual environment?

• what do you do for DR?

• what happens if you use more than one storage platform or vendor?

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Is This Your Real Environment?

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Enterprise Environments…

SAN

NAS/iSCSI

NAS/iSCSI Array

VM Volumes

ESX

WAN

Hype

r-V

DB1

DB2

DB3

DB4

DB1

DB2

DB3

DB4

Exchange DatabaseVolumes (DAG)

ExchangeCluster

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DB1

DB2

DB3

DB4

DB1

DB2

DB3

DB4

Exchange DatabaseVolumes (DAG)

Passive

Active

Client Access Server

DB1

DB2

DB3

DB4

WAN

Double-Take DAG Protection

ExchangeCluster

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App_Svr_1 App_DR_3

The source image is mirrored to the target server

After reboot, the target server now has the identity and data of the original source

At failover time, the system state of the source is merged with the target server

Real-time Replication continuously protects the source

Custom App

Custom App

Data Data

Custom App

App_Svr_1

If App_Svr_1 goes down, will failover to App_DR_3.

Double-Take Full Server Failover

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App_Svr_1App_DR_3

The application and data are mirrored to the new target server

– Source and Target swap roles.– Subsequent Failover will move App_Svr_1 back to the original source server. – This same “Reverse” technology also works for VMware ESX VM’s

On Reverse, the system state of the original target is merged with the original source server

Real-time Replication continuously protects the source

Custom App

Data

Custom App

App_Svr_1

The original source comes back on line.

Data

Double-Take Full Server Reversal

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Enterprise Environments…

SAN

NAS/iSCSI

NAS/iSCSI Array

VM Volumes

ESX

WAN

Hype

r-V

DB1

DB2

DB3

DB4

DB1

DB2

DB3

DB4

Exchange DatabaseVolumes (DAG)

ExchangeCluster

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Hype

r-V

Hype

r-V

Double-Take Host Agent Double-Take Host Agent

WAN

ESX

Hype

r-V

Double-Take Guest Agent Double-Take Guest Agent

WAN

Double-Take for Virtual Servers

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C:Replicated

E: NotReplicated

D: Replicated

Web_1

..\source\C\

..\source\D\

C:\

Protection to a Hyper-V or ESX hostOnly the VRA Helper is pre-configured

Virtual Recovery Assistant

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Virtual Recovery Assistant

C:\

C:\

D:\

Web_1C:Replicated

E: NotReplicated

D: Replicated

Protection to a Hyper-V or ESX hostOnly the VRA Helper is pre-configured

Source isshut down

Recovery VMis started up

Web_1

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Enterprise Environments…

SAN

NAS/iSCSI

NAS/iSCSI Array

VM Volumes

ESX

WAN

Hype

r-V

DB1

DB2

DB3

DB4

DB1

DB2

DB3

DB4

Exchange DatabaseVolumes (DAG)

ExchangeCluster

Virtual

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Physical. Virtual. Cloud.

Solutions for availability, backup and migration in physical, virtual, and cloud environments

Cloud

Virtual

Physical

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• Platform Independent Replication

• Migration - Move

• Virtual Availability

• Enterprise Protection

• Virtual Recovery Assistant

Recap and Questions

Physical

Cloud

Virtual

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Coming Soon

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Double-Take Virtual Recovery Appliance

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Questions?

Questions

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Follow Vision On Popular Social Networks

visionsolutions.com

businesscontinuitytoday.com

twitter.com/VSIDTInfo

facebook.com/vsichannel

youtube.com/vsichannel

linkedin.com/companies/6542

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Multi-VM Protection