How to do Fail-over and Replication between Datacenters


Replication and Fail-over will be different for case to case, it all depends upon the companies’ production environment and defined RTO & RPO. There are several factors to be considered while doing Failover/Replication such as bandwidth and connectivity. DR can be done in several ways, it can be done between VM to VM, Physical to VM, VM to Host level and between applications etc. For best practice this should be between different datacenter geographically different.

Below process best describes Failover and Replication between two VMs, between geographically different datacenters. Here one VM hosted on datacenter ‘A’, Win2K8R2 with IIS installed and wants to replicate/failover with another VM (plane VM – server1.cloudconnectlive.com) on datacenter ‘B’, both VMs are same configurations but more storage space on the B side.

Let’s start with server1.cloudconnectlive.com, download Double Take 7.1.1.0 on server1

DT01

Select Double Take Availability option 

DT02

check for updates

DT03

DT04

Click license activation

DT05

Select client and server option. For best practice select a separate server for management

DT06

Open ports

DT07

license can be activate later

DT08

select a queue path  

DT09

DT10

click finish

DT11

Do the same process in Server 2 (production server)

Open Double Take from start menu, click on add server option

DT12

Put user credentials

DT13

Click OK

DT14

DT15

do the same for server2

DT16

DT17

Click on the manage license option and the license

DT18

Select server 1, click edit and assign the license key

DT19

click on Double Take Availability

DT20

Click on the below option

DT21

select source server, in our case it’s server 2

DT22

Select full server

DT23

select target server, here it’s server 1

DT24

select below option depends upon your plan

DT25

DT26

click finish

DT27

you can see the activity, synchronization time period will depends on the size of the data and bandwidth 

DT28

DT29

After initial synchronizing you can see the message below

DT30

DT31

you can see, now server 1 doesn’t have IIS installed

DT32

click on failover

DT33

select live fail over

DT34

After successful fail-over, server 2 will shutdown automatically and all system/application data will be migrated to server 1, you can check and verify the destination server now. IP address will remain same / change to source IP  depends upon the option you select.

DT35

Done !!!!!

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