How much of a performance overhead is there for sub-volume automated tiering on SSDs?
Sub-volume automated tiering does trigger additional work to be performed by the storage system, whether SSDs or HDDs are involved. Although we haven’t yet tested the performance impact of sub-volume automated tiering on SSDs, there would be a significant number of writes that would occur during the scheduled data movement phase of sub-volume automated tiering, either because new data was being moved to the SSDs, or old data was being moved off the SSD, which would trigger flash media garbage collection.
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There would be a performance impact, but it would be hard to predict without knowing a bit more about the particular SSDs and the tiering profile and policies.
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