How to deal with backup when you switch to hyperconverged infrastructure

Vendors of hyperconverged infrastructure provide options for making it easier to backup data on-site, in the cloud or both, but which is best?

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Companies migrating to hyperconverged infrastructure (HCI) systems are usually doing so to simplify their virtualization environment. Since backup is one of the most complicated parts of virtualization, they are often looking to simplify it as well via their migration to HCI.

Other customers have chosen to use HCI to simplify their hardware complexity, while using a traditional backup approach for operational and disaster recovery. Here’s a look at cover both scenarios.

Different types of HCI

Sometimes an HCI system is a collection of hardware on which you run your favorite hypervisor. This is the most common type of HCI vendor and includes products like Nutanix, Simplivity, Datrium and VxRail. 

Each HCI vendor offers a hardware configuration using components supported by the virtualization vendors it wishes to support. Since the system comes pre-built you can be assured that all the hardware components will work together and will work with any supported hypervisors. Any incompatibilities between the various components will be handled by the HCI vendor.

Some HCI vendors also offer their own hypervisors. The best example of this would be Nutanix with their Acropolis hypervisor. Typically such a hypervisor will offer tighter integration with the HCI hardware and integrated data-protection features. Often, the built-in hypervisor is also less expensive than traditional hypervisors, especially if you take advantage of the native data-protection features.

The final type of HCI vendor supports neither VMware nor Hyper-V, nor do they use their own hypervisor. Scale Computing uses the KVM hypervisor, which is open source. Like Nutanix, they do this to reduce their customers’ TCO while offering much of the same functionality that VMware offers. In addition, they also offer integrated data protection.

Integrated data protection

All three types of HCI vendors mentioned above offer integrated data protection. These companies recognize that backup and recovery of traditional servers is complicated enough; virtual servers can be even worse due to the scarcity of I/O resources. So one of the problems that HCI vendors attempt to solve for their customers is the simplification of backup and recovery.

Traditionally, this is done is through the use of snapshots in the HCI product. The snapshots are done at the storage level, with some type of integration into the hypervisor so that the correct thing happens in the operating system when an HCI snapshot is taken.

For example, most hypervisors integrate with the Windows Volume Shadow Service (VSS). When it's time for an HCI snapshot, the hypervisor first tells each VM to create a VSS snapshot. This creates an application-consistent view of the operating system to the hypervisor or HCI data protection system that will then take a snapshot of that snapshot. Once the hypervisor or HCI snapshot has been created, it can release the VSS snapshot.

The entire snapshot-creation process may take only a few seconds from end to end, since it isn’t moving much data, but it is important to understand that at this point it is only a virtual copy of the data. The snapshot needs to be replicated to another system in order to be an actual backup, and all HCIs vendors do just that. Once the bytes specific to that snapshot have been replicated to another system, you have a complete backup of the latest version of all VMs in the snapshot.

Some customers replicate their secondary copy to another HCI system inside their data center, and others send it to the cloud. Customers who store their secondary copy on a local HCI system may also replicate that copy to the cloud. That way they have an onsite and an offsite copy of all systems.

Some HCI vendors with integrated data protection can then replicate the VM's into the cloud and spin them up for DR purposes. If they are able to do that, customers have a local recovery option and a cloud recovery option without spending any money with a third-party data-protection system.

Integrated data protection is not new

The most well-known vendor that started saying that data stored on their systems didn't need to be backed up in the traditional way is NetApp. (Many other storage vendors have since followed NetApp’s example, but they were clearly the early leaders in this space.)

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