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How should snapshot overhead be determined?

When calculating overhead, you should keep storage snapshots in mind. Learn how to account for snapshots.

Q: How much overhead should be factored in for snapshots?

About the author
Storage expert Kurtis Lindemann is the director of Technical Services for RoundTower Technologies, a storage service provider based in Cincinnati. Listen to the rest of Kurtis' answers on assessing a customer's storage capacity by downloading our storage capacity podcast.

You will want to work with the array vendor you are specifying to ensure you are meeting their best practice guidelines. At a minimum, if they are keeping block-level changes, you'll want to reserve some small percentage of space for snapshots to ensure you can always take them when you need them. Some vendors require setting aside a significant portion of the storage for snapshots and/or replication, so you want to be sure that you've factored that in. Also, beware that some vendors that provide "unified" or all-in-one SAN and NAS solutions have different best-practice guidelines for the NAS data than they have for SAN, so make sure to account for those differences when sizing.

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