So, you have usable flash capacity, which is the capacity before deduplication and compression is applied. The...
effective flash capacity is the array's capacity with dedupe and compression turned on.
Many vendors claim a 4:1 or 5:1 data reduction ratio for their systems -- based on typical use. I think that's primarily because of the type of environments they've gone in to. For example, databases have a lot of redundant data, and as such, are very conducive to data reduction.
If you are using an array for general purpose storage for a variety of types of data, not just databases, you're likely to see somewhere in the neighborhood of 3:1 data reduction. So, if I was planning, I would plan for 3:1 even if the vendor says they're able to get 5:1.
That 3:1 ratio is a very conservative number, and typically the people who use the systems are very conservative. And so, that's a practical number work with. Many vendors offer an absolute guarantee of at least 2:1. So that's great, take advantage of it.
Dell aims Project Hermes at moving flash capacity onto the server
LSI doubles flash capacity on Nytro cards
Dig Deeper on All-flash arrays
Related Q&A from Randy Kerns
Logical unit numbers are a logical abstraction between a physical disk device and applications. Learn more about LUN use cases and LUN security ... Continue Reading
What is the one hidden gotcha that you'd advise users about if they were shopping for an all-flash storage array? Continue Reading
How much control do you have with all-flash storage arrays? How much control do you have over how arrays handle your data? Do you control the caching? Continue Reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.