Is there a general advice or white paper about how much SSD capacity (tier) we should install in a pool for tiering? 20%?
Cheers and thanks
Dell EMC recommends provisioning a Flash tier in hybrid pools. The Flash tier helps enable pool performance efficiencies, and improves response times when using Snapshots and/or Replication. The minimum recommended Flash capacity is at least 5% of the pool capacity.
The minimum should be at least one, 4+1 R5 - more is the size of the Pool is very large, then use the 5% recommendation.
Also, pay particular attention to the section on page 11 "GENERAL RECOMMENDATIONS".
I would see that as a minimum - esp. for thin provisioning since this also includes the metadata which is preferably put on flash
So if you want 5% user data on flash you need more than that
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