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Dynamic Tiering best practices

Question asked by Saver Ur on Aug 7, 2014

I am new to this tiering and just trying to understand the best way to implement dynamic tiering in our customer environment.

Are there any best practices document on tiering implementation?

 

Here is an example to illustrate,

1. Create HDT pool (p1) with 3 tiers (SSD,SAS & SATA)

2. Create HDT pool (p2) with 2 tiers (SAS & SATA)

How to choose best pool out of these considering a level 0 policy ("places the data in all tiers" as per cli guide) for a volume to create?

How to choose best pool out of these considering a level 5 policy ("places the data preferentially in Tier 2 when there are two tiers, and preferentially in Tier 3 when there are three tiers" as per cli guide) for a volume to create?

 

I also would like to know is there a standard to define high, medium or low tier?

Ex. High => SSD only, Medium => SAS only or Low => SATA like this.

 

Thanks in advance.

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