EqualLogic Replication


EqualLogic Replication

by Brad Fair

If you’re familiar with EqualLogic (and even if you’re not), you probably know that every EqualLogic array has built in replication features to help you get your data backed up offsite should something ever happen to your production data. There are a few questions you might have about replication, and I hope to be able to answer them. Please comment if you have any questions I didn’t answer in this post!

How EqualLogic Replication Works

EqualLogic replication takes a point-in-time copy of a volume and places it in another EqualLogic group (ideally geographically separate from the original). After the first copy has been moved, each subsequent copy is comprised of the changes that have taken place on the volume since the last replica. Effectively, that means that after your first replica, if you only change 1GB of data, 1GB of data will replicate for your second replica. This efficiency allows you to replicate faster and more frequently. If you feel like your replicas are larger than they should be based off of the amount of data you typically change, check out my article on Unnecessarily Large EqualLogic Snapshots – the concepts are the same.

EqualLogic Replication Requirements – What do I need?

The requirements for replicating with EqualLogic are very minimal. You need:

  • Two or more EqualLogic groups (each with one or more members) and their information,
  • Communication between groups on Layer 3, and
  • A volume to replicate.
Once you’ve met these requirements, you can configure replication. 

EqualLogic Replication How To – How do I configure replication?

Configuring replication is extremely easy, as long as you have the requirements listed above. Follow these steps:
  1. In your production group, right click the menu item that says “Replication Partners” and click “Configure Partner”
  2. Enter in all the necessary information, and select Finish.
  3. In your replication group, do the same.
  4. Back in your production group, right click the volume you want to replicate, and select “Configure Replication”.
  5. Enter in the necessary information, and select Finish.
  6. If you need to, create a schedule for replication. 
I will be the first to admit that these steps are not entirely informative – while they will get you where you need to be, there is more information for me to share on configuring replication. I will do so in another article, and update this page with a link afterwards – stay tuned!

EqualLogic Replication Ports – What ports do I need open for replication to work?

This one’s an easy one. There’s only one port that needs to be open in order for replication to work – that’s port 3260, the iSCSI port. There are other ports required for arrays communicating within a group, which I will cover in another entry.

EqualLogic Replication Demo

If you don’t have the second group, or if you want to see how replication works while considering purchasing an EqualLogic array, please call me at 405-624-3214, email me at brad.fair@interworks.com, or get me on twitter, @bradfair. We have an array that we use for demonstrations, and will be more than happy to configure replication on our own production environment to show you how simple it is!

More About the Author

Brad Fair

Solutions Architect
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