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Windows Azure Site Recovery Scenarios


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Windows Azure Site Recovery provides a complete DR solution (replication of workloads and automated DR for failover/failback). ASR helps you to automate the replication of your on-premises servers and virtual machines to a secondary data center.

 

Deployment Scenarios 

ASR provides you five different options to protect your on premises VM workloads from to an extended data center.

 

1. Hyper-v to Hyper-v (On Premises)

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In this scenario you can orchestrate and automate workloads running on virtual machines hosted on Hyper-V servers that are managed by Virtual Machine Manager (VMM) private clouds to replicate to the secondary site. All the virtual machines are replicated from primary site VMM to a secondary VMM site by using Hyper-v replica.

 

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Hyper-V to Hyper-V (On Premises) step by step – https://azure.microsoft.com/en-us/documentation/articles/site-recovery-vmm-to-vmm/

 

2. Hyper-V to Hyper-V SAN Replication

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In this scenario you can orchestrate and automate workloads running on virtual machines hosted on Hyper-V servers that are managed by Virtual Machine Manager (VMM) private clouds. All the virtual machines are replicated from primary site VMM to an extended VMM site by using Storage Array-Based (SAN) replication. SAN replication capabilities provided by storage partners across both Fiber Channel (FC) and Internet Small Computer System Interface (iSCSI) storage. This supports for asynchronous replication for flexibility or synchronous replication for the lowest RPO/RTO.

 

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Hyper-V to Hyper-V SAN Replication step by step – https://azure.microsoft.com/en-us/documentation/articles/site-recovery-vmm-san/

 

3. Hyper-V to Windows Azure

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In this scenario you can orchestrate and automate workloads running on virtual machines hosted on Hyper-V servers that are managed by Virtual Machine Manager (VMM) private clouds to replicate to the secondary site. All the virtual machines are replicated from primary site VMM to a secondary VMM site by using Hyper-v replica.

 

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Hyper-V to Windows Azure step by step – https://azure.microsoft.com/en-us/documentation/articles/site-recovery-vmm-to-azure/

 

4. VMWare or Physical to VMWare

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Microsoft has acquired InImage in 2014 and merged with Azure Site Recovery service in order to give customers a simple, cost-effective way to ensure business continuity with the power and scale of the Azure global cloud. This supports heterogeneous replication and protection of physical and virtual environments regardless of underlying hardware.

 

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Prod Servers

•Discovery of production server OS & configuration (physical & virtual)

•Continuous capture of changing data blocks (CDP)

•Continuous transfer of captured blocks to Process Server cache

•Application detection and consistency

 

Process Server

•In-line compression of incoming CDP data on behalf of prod. servers

•Caching of compressed CDP data and resiliency to WAN outages or QoS problems

•Bandwidth throttling of replication traffic to a Master Target

•Encryption of replication traffic

•Capture of each prod. server & volume level change rate stats

 

Configuration Server

•Replication and recovery policies stored in its DB

•Web-based UI with extensive graphs, reports, and UI/email/SNMP alerts

•User management

•Management dashboard, monitoring pie-charts, real-time granular RPO display

 

Master Target Server

•Downloading data from Process Server and writing to DR VM disks for multiple prod servers (on behalf of all the powered off DR VMs)

•Copying older data from DR VM disks into a journal to allow point-in-time recovery

•Cataloguing the application consistency and recovery points

•Virtual snapshots to allow file and folder recovery at any point in time

•Recovery and cloning of DR VMs for failover as well as non-disruptive drills

•N-tier application recovery

•Inter application recovery sequencing

•Network adaptation of DR VMs to the recovery IP subnet/VLAN

 

Note: Incase you plan to failover VM’s from DR site to Primary Data Center, it is mandatory to have a Master Target server setup in Primary Data Center.

 

VMware or Physical to VMWare step by step – https://azure.microsoft.com/en-us/documentation/articles/site-recovery-vmware-to-vmware/

 

5. VMware or Physical to Windows Azure

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In this scenario you can plan to replicate, failover and recovery of on premises VMware Virtual machines, Physical Windows and Linux Servers by using Azure Site Recovery Service.

If you have one or more VMware Data Centers now you can failover over all the Onpremises VM work load to the Windows Azure with a technology call SCOUT. This technology falls under the azure site recovery umbrella which lets you manage and orchestrate your disaster recovery. This is using the guest based replication technology to failover VM’s between Onpremises and Windows Azure.

 

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Vmware or Physical to Windows Azure Step by Step – https://azure.microsoft.com/en-us/documentation/articles/site-recovery-vmware-to-azure/

 

FAQ:

Azure does not support VHDX. Is VHDX supported for replication?

Yes. Microsoft converts VHDX to VHD for failover. On failback, and get back to VHDX.

Is Gen2 supported?

Yes. ASR converts Gen-2 VMs to Gen-1 on Azure.

What are the OSes supported?

ASR supports all the OSes supported in Azure, which includes most flavors of Windows and Linux.

Can I send my replication traffic over ExpressRoute?

Yes. You can use ExpressRoute to send your replication traffic in a secure and fast manner.

Can I control the network traffic used for replication?

Yes you can use the network throttling on the host agent to control how much network bandwidth is used for replication.

What is the RTO for failover?

Depends on the applications of the customer. The SLA for Azure is 4 hours

http://azure.microsoft.com/en-in/support/legal/sla/

How do I connect to the VMs post failover?

If you are connected to the on-premises network via Azure Network Gateway, you connect in the same way as before failover. You can open the RDP port on the VMs if you are planning to connect to the VMs via the public internet.

Do I pay for the IaaS VM?

When you are protected, you are paying for the ASR license. Only post failover, you will pay for the license of the Iaas VM.

Is failback supported?

Yes – you can failback to on-premises. There are flexible options which optimize for resources or for downtime.

 

Source: ASR Partner Presentation

I hope this article would help for you guys.. Happy reading… Smile

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