Cohesity – NAS Data Migration Overview

Data Migration

Cohesity NAS Data Migration, part of SmartFiles, was recently announced as a generally available feature within the Cohesity DataPlatform 6.4 release (after being mentioned in the 6.3 release blog post). The idea behind it is that you can use the feature to perform the migration of NAS data from a primary source to the Cohesity DataPlatform. It is supported for NAS storage registered as SMB or NFS (so it doesn’t necessarily need to be a NAS appliance as such, it can also be a file share hosted somewhere).

 

What To Think About

There are a few things to think about when you configure your migration policy, including:

  • The last time the file was accessed;
  • Last time the file was modified; and
  • The size of the file.

You also need to think about how frequently you want to run the job. Finally, it’s worth considering which View you want the archived data to reside on.

 

What Happens?

When the data is migrated an SMB2 symbolic link is left in place of the file with the same name as the file and the original data is moved to the Cohesity View. Note that on Windows boxes, remote to remote symbolic links are disabled, so you need to run these commands:

C:\Windows\system32>fsutil behavior set SymlinkEvaluation R2R:1
C:\Windows\system32>fsutil behavior query SymlinkEvaluation

Once the data is migrated to the Cohesity cluster, subsequent read and write operations are performed on the Cohesity host. You can move data back to the environment by mounting the Cohesity target View on a Windows client, and copying it back to the NAS.

 

Configuration Steps

To get started, select File Services, and click on Data Migration.

Click on the Migrate Data to configure a migration job.

You’ll need to give it a name.

 

The next step is to select the Source. If you already have a NAS source configured, you’ll see it here. Otherwise you can register a Source.

Click on the arrow to expand the registered NAS mount points.

Select the mount point you’d like to use.

Once you’ve selected the mount point, click on Add.

You then need to select the Storage Domain (formerly known as a ViewBox) to store the archived data on.

You’ll need to provide a name, and configure schedule options.

You can also configure advanced settings, including QoS and exclusions. Once you’re happy, click on Migrate and the job will be created.

You can then run the job immediately, or wait for the schedule to kick in.

 

Other Things To Consider

You’ll need to think about your anti-virus options as well. You can register external anti-virus software or install the anti-virus app from the Cohesity Marketplace

 

Thoughts And Further Reading

Cohesity have long positioned their secondary storage solution as something more than just a backup and recovery solution. There’s some debate about the difference between storage management and data management, but Cohesity seem to have done a good job of introducing yet another feature that can help users easily move data from their primary storage to their secondary storage environment. Plenty of backup solutions have positioned themselves as archive solutions, but many have been focused on moving protection data, rather than primary data from the source. You’ll need to do some careful planning around sizing your environment, as there’s always a chance that an end user will turn up and start accessing files that you thought were stale. And I can’t say with 100% certainty that this solution will transparently work with every line of business application in your environment. But considering it’s aimed at SMB and NFS shares, it looks like it does what it says on the tin, and moves data from one spot to another.

You can read more about the new features in Cohesity DataPlatform 6.4 (Pegasus) on the Cohesity site, and Blocks & Files covered the feature here. Alastair also shared some thoughts on the feature here.

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