How does metric weight work in the Volume Rightsizing Policy?

Products

• CloudHealth

Issue/Introduction

1. If you retain the default weights and thresholds in the policy, each Topic Score will contribute toward 33% of the Total Score. If you have a volume called Volume1 running at 75% across the board for Usage, Read Throughput, and Write Throughput, the Total Score for the volume would be 84.

2. Consider that you want to rightsize some of your file server volumes. You can use a new rightsizing policy to change the weight of the Write Throughput from 1 to 2. Now, Write Throughput accounts for two times the score for Usage or Read Throughput. The contributions of the three metrics to the Total Score are now as follows:

   • Write Throughput: 50%

   • Usage: 25%

   • Read Throughput: 25%.

   If you apply this policy to Volume1, which is running at 75% Write Throughput, the Total Score would continue to be 84.

3. After a week, Volume1 is running at 75% Write Throughput (Score is 84), 49% Usage (Score of 66), and 35% Read Throughput (Score is 33). Using the default weights, the Total Score would be 61, since it is the equal average of 84, 66, and 33. However, if the weight of the Write Throughput is increased to 2, the Total Score is calculated as follows:

   Total Score = (84 * 0.25) + (66 * 0.25) + (33 * 0.5) = 54