mardi 7 mai 2013

Which type of failover site is right for your organization’s Disaster recovery needs ?


After dialing with Business Impact Assessment and defined your right RTO and RPO value for each critical applications, you can have a very well view about the right failover site for your organization.

In this post I will present the different type of failover site which can be right for your disaster recovery site.

We can define  four type of failover site :

1- Mirrored site
2- Hot site
3- Warm site
4- Cold site


1- Mirrored site


  •    Instantaneously recovers a company’s mission critical applications from a disaster.
  •    Site resides in a geographically distinct data center.
  •    Maintain identical pairs of servers, networks, storage devices.
  •    Most expensive.

2- Hot site

  •    All infrastructure components are prepared, running and ready. 
  •    Full duplication of all data and systems. 
  •    System configuration and application data are sometimes replicated asynchronously and at    failover. 
  •    Application will typically be started at the hot site. 
  •    Hot site can be deployed using Active-Active failover or Active-Passive failover.
3-Warm site

  • The failover isn’t automated via a site recovery manager or stretched cluster. 
  • Recovery of individual applications and servers must be accomplished manually. 
  • You can perform some replication to ensure that Data is available. 
  • Systems and application are installed, prepared and ready to run.
4-Cold site

  • Appropriate for systems and applications that can be recovered in greater than 6 days without impact to the business.
  •  Backups of system configurations, data, and applications are periodically shipped to an offsite data vault.
  •    You have to start from the beginning:
ü  Arrange Networking. 
ü  Procure Hardware.
ü  Build the systems.
ü  Restore The Data.
ü  Configure Client access.

  • Can reduce time by having contracts in place to supply network and hardware.
  • The cheapest option.

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