First, let's go through the definition of the term
"Disaster Recovery" or in short as its commonly used by IT
professionals "DR."
From an IT point of view, a disaster is anything that stops
the operability of IT services in any organization. IT services, such as
Infrastructure failure or cyber attack ... etc.,
What is "RTO and RPO" and why it is matter?
Recovery Time Objective or "RTO" is the
time needed to recover your IT Services operations after a disaster has
occurred, You’ll want your RTO to be as short as possible,
Recovery Point Objective or "RPO" is the number
of data changes you lose that your company or organization can sustain or how
much data changes you can afford to lose if a disaster happened,
For example: if a disaster happened at 11:00 AM and your DR
solution can recover your Data with change updated until 10:45 AM then your
"RPO" is equal "15 Minutes RPO", if your DR solution can
recover your data with changes updated until 11:00 AM then your RPO is equal to
"0".
Nutanix Provide multiple DR solutions for various use
cases using Asynchronous, Synchronous, and Near Synchronous replication to
support infrastructure recovery as part of a complete business continuity plan:
- Asynchronous DR
- Near Synchronous DR
- Cross-Hypervisor DR
- Metro Availability (Synchronous Replication)
- Metro Availability with Witness (Synchronous Replication)
- Cloud Connect to Azure and AWS (Backup to Cloud)
- Nutanix On-Prem Leap
- Xi Leap Disaster Recovery Service (DRaaS)
Asynchronous DR
The Term "Asynchronous Replication" itself means
to store and forward approach, in another word, writes data to the primary
storage array first and then commits data to be replicated to replication
targets based on a specific schedule,
Step by step building and configuring Asynchronous DR using Nutanix Native Async DR feature
Near Synchronous DR
NearSync DR provides the best of both worlds: zero impact to
primary I/O latency (like async replication) in addition to a very low RPO
(like sync replication (metro). This allows users to have a very low RPO without
having the overhead of requiring synchronous replication for writes.
Cross-Hypervisor DR
Nutanix provides cross-hypervisor disaster recovery for
migrating and DR services between two sites running different hypervisors (ESXi
and AHV Clusters).
Metro Availability (Synchronous Replication)
The Term "Synchronous Replication" itself
means the process of copying data over a storage area network, local area
network or wide area network, so there are multiple, up-to-date copies of the
data,
In another word, when any data write happen in the main
site another copy is sent to DR and wait for DR confirm that the data is
written in DR before committing the data in the main site, that will make
the RPO equal to "0", it is required that the round trip
latency between both sites be equal to or less than "5 ms"
Maintain adequate bandwidth to accommodate peak writes. It is also recommended
that you have a redundant physical network between both sites.
Step by step building and configuring Metro Availability using Nutanix Metro Availability Synchronous Replication DR feature - Click Here
Metro Availability with Witness
Similar to normal Metro Availability, RPO equal to
"0" and even the configuration from Prism is almost the same, the
difference is regarding how the system will react to site failure (Failure
Handling),
Step by Step coming Soon
DR Orchestration (On-prem Leap)
Nutanix Leap will help you setup, configure,
orchestrate and automate all the DR services from centralized location from
Prism Central, From AOS 5.11 onward, Nutanix adds protection policies and
recovery plans to Prism Central for AHV and ESXi, offering an easy way to
orchestrate operations around migrations and unplanned failures, Now you can
apply orchestration policies from a central location, ensuring consistency
across all your sites and clusters, To help manage these new protection
policies and recovery plans, Nutanix uses a construct called Availability
Zones managed by one Prism Central. An availability zone can also
represent a region in Nutanix Xi Cloud Services.
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