Hey,
1. The eHealth data source does not provide the total disk throughput value that CCC leverages. You are correct in that all the eHealth disk metircs are % disk busy, not how much bandwidth is used or total space used.
I would recommend not collecting disk metrics from eHealth.
2. Clarification, you can and should use the 'weekly' VMware data adapter and not use the 'daily'. BUT what I am recommending is to use the 'weekly' data adapter (DA) but schedule it to run 1x per day.
The 'Daily' and 'Weekly' data adapter names are referring the the vCenter database metric rollup table that is queried.
The 'Daily' DA pulls data at 5 min increments and is stored in the vCenter DB for 24 hours. The 'Weekly' DA pulls data at 15 minute increments which are stored for 7 days. This means that for the same time period the daily DA will pull 3x the rows as the weekly.
So again, use the Weekly DA and schedule it to run 1x per day.