selym wrote:
Thanks again for the response. Perhaps I've just never noticed how much space these things take up, but does it sound right that RAID overhead + reserved space would equal 30 terabytes out of a total 73 allocated (to 2 CPG's)?
It depends. Worst case scenario:
If you have 6x7.68TB(or lets say 8TB for easy math) SSDs, with default sparing and R6 (4+2) you have 48TB of space. You reserve 1 per per 24 SSDs with a minimum of 2 to spare, that is 16TB in this example. Then you have 32TB RAW left. With R6 (4+2) you have 33% RAID overhead and lose ~11TB to overhead and is left with ~21TB for data. That is 21TB of data for 48TB RAW...
Sparing can be reduced to minimum and RAID levels can be changed...