Tag : Replication

Zerto: Can Failover Live Be Used for a Datacenter Migration, Consolidation, or HW Refresh?

The answer is yes, if you really wanted to… however, there’s another feature of Zerto that will allow you to perform a much “cleaner” migration of your VM(s) with a more planned approach.

This feature may not be easily located, as it’s found within the Actions menu in the Zerto UI, but it’s actually a very valuable one that basically allows you to migrate VMs from one location to another (cluster to cluster, vCenter to vCenter, vSphere <> Hyper-V, On-Prem to Public Cloud, Site to Site – even from one vendor’s hardware to another) with no data loss.  That’s right, an RPO of ZERO.

Failover Live (FOL)

First off, since the title of this blog post mentions “Failover Live”, or as we abbreviate it as FOL, lets talk about that method first.  What is the FOL process, and how does it work?

The FOL process is an operation that should be used following a disaster to recover your protected VMs in a recovery site, or in the event the protected site ZVM is not available.  The main thing to note here is that when you execute a FOL, Zerto will default to the latest checkpoint, or you can select a previous checkpoint in time to recover to (usually within seconds of each other).  Additionally, you have the option to either leave the VMs in the group running, power them off, or force a shutdown.

Essentially what this means is that when using FOL, Zerto is expecting that there’s been an unplanned environment disruption of some sort and  you need to resume production as quickly as possible in your recovery site.

Here’s the workflow for a failover operation.  You can download a PDF version of this diagram here.

Zerto Virtual Replication Failover Live Workflow Diagram

Please note, that the workflow objects in yellow include some decisions you will need to make based on your type of disruption as it relates to the power state of the VMs in your protected site (Shutdown (gracefully), Leave Powered On, or Force Shutdown).

Regarding my earlier comment about ZERO data loss, this method will only get you to the latest checkpoint when the outage was detected, or a previous checkpoint.  You can choose what point in time to recover to, which in either option, will be a crash-consistent state which may not be desired for something like a migration project.

For additional detail about the Failover Live (FOL) process and how it works, including considerations, see the Zerto Virtual Manager Administration Guide for vSphere.

Move VPG

As opposed to an unplanned disruption to your environment, the “Move VPG” operation in Zerto is recommended when you’re performing a planned migration whether it be your DR site, public cloud, new hardware, or other datacenter.  The difference here is that when you perform a planned migration of your virtual machine(s) to a recovery site, Zerto assumes that both sites are up and healthy and that you are performing a relocation of the virtual machine(s) in a controlled/orderly fashion – with the expectation of no data loss.

Here is the workflow for a Move VPG operation.  You can download a PDF version of this diagram here.

Zerto Virtual Replication Move VPG Workflow Diagram

So as you can see from the workflow above, the steps are a bit different than a failover live, as there are actually some steps taken in the protected site before VMs are brought up in the recovery site to ensure that what is booted is in the exact same state as the source copy.

For additional detail about the Move VPG process and how it works, see the Zerto Virtual Manager Administration Guide for vSphere.

Summary

While you can still use the FOL process to migrate VMs from one location to another, there is still going to be some level of data loss and a crash consistent boot.

To ensure you don’t lose any data (even data that may be in memory at the time you perform a FOL), the “Move VPG” operation will take care of automating the safe/graceful shutdown of a VM and replicate any remaining data before powering up in the recovery site.

When performing either operation, be sure to verify your commit policy as well, because you would want to make sure that the recovered/migrated VM is in a usable state before committing it to the recovery location because once you commit the change, you must wait for promotion and reverse protection (delta sync) to take place before you can perform a failback.  Both options will allow you the ability to rollback without commit, but behave differently in terms of the expected state of the protected site.

 

 

 

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Configuring AWS for Zerto Virtual Replication

By now, it’s no secret that the IT Resilience Platform that Zerto has come to be known as offers complete flexibility when it comes to multi-cloud agility.  This agility allows businesses to accelerate their digital transformation and truly take advantage of what the public cloud platform offers – ensuring even more freedom to choose your cloud and to be able to replicate workloads to, from, and even between public clouds.  As there have been great improvements in Zerto’s any-to-any story, one in particular I’d like to focus on in this article is AWS (Amazon Web Services).

Starting with Zerto Virtual Replication 6.0, customers now have:

  • Orchestration allowing not only targeting AWS for DR or for workload migration, but now the ability to come back out of AWS to on-premises datacenters, or even the ability to replicate between public cloud providers (AWS, Microsoft Azure, IBM Public Cloud) and Cloud Service Providers (CSPs).
  • Zerto Analytics visibility between all sites, including public cloud, now with network statistics and 30-day history.

Now, while these improvements are exciting and offer even more cloud agility to customers, one can’t help but realize that before you can actually start taking advantage of ZVR 6.0 to achieve a hybrid cloud architecture or DR in the cloud (specifically AWS), there are some pre-requisites to complete before doing so.  That said, meeting those requirements may not seem as intuitive as you’d hope at first glance.

While having a cloud use-case is usually the first step, and is determined by business requirements – the challenge lies within understanding what exactly needs to be configured in AWS for ZVR functionality, and how to accomplish it. If you take a look below, the workflow itself is a multi-step process that may not be very easy to perform, until now.

ZVR AWS Workflow
Figure 1: Configuring AWS for ZVR – Workflow

In my usual fashion of wanting to know exactly how things are done and then sharing it with everyone else, I’ve written a how-to document for configuring AWS for Zerto Virtual Replication, which I am happy to say has been turned into an official Zerto whitepaper and is now available for download!

>> Whitepaper – Configuring AWS for Zerto Virtual Replication <<

As usual, feedback, is welcomed with open arms. If you find this useful, please share and be social!

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