Automated tiering has become a popular offering among most major storage vendors. The ability to automatically and intelligently move part of a LUN or volume to the appropriate storage media based on performance requirements or frequency of use has shown a performance and management value to some IT infrastructures. This is great for taking frequently accessed data and storing it in high-performance storage, like solid-state storage. The ratio of data that is frequently accessed is very small, on the average of 3% to 6% hot blocks for most environments. It’s like the 80/20 rule where 20% of the data accounts for 80% of the activity.
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