I was hoping someone could explain the cache churn graph on Infosight to me.
For example if the graph shows Volume-A with a Business Hours, small I/O value of 25% does this mean...
- 25% of data removed from cache came from Volume-A
- 25% of data added to cache was from Volume-A
- 25% of cache space is currently allocated to Volume-A
- 25% of cache hits were from data on Volume-A
I would assume it was one of the first two (churn implies change) but it would be good to get some confirmation of this and how to better understand the information presented.