I have read about ADP and it looks like the data is partiitoned automatically by the system. Does anyone have a guide on the approx space reserved by the system for ADP. Does it vary for SATA/SAS/SSD drives or what is the logic. I am just trying to calculate some usable space and need this info.
The root partition size is fixed and automatically set per controller. The actual amount will vary for the total of the root data partition between 430.9GiB (462.7GB) to 431.5GiB (463.3GB). The reason for this 0.13% fluctuation is due to the differing numbers of 4k blocks available with different spindle counts. Of course, the OCD in me wishes it was always just 450GB for a nice round number!
The way that root partition is parceled out is then based upon the number of disk drives with root partitions, calculating for the appropriate RAID level and hot spares as well. Here are the common disk configurations and their corresponding root disk sizes: