We just installed a FAS8020. It is dual controller with two shelves of 900 GB SAS drives and one shelf of 4 TB drives. The plan is to use the 900 GB SAS drives for production systems and the slower 4 TB drives for backup and dev and test systems.
My plan was to put the two 900 GB shelves on controller 1 and the 4 TB shelf on controller 2. I'm torn about having a dedicated root aggregate - I would like to have as much space as possible and it seems like more and more folks are moving away from that so I would like a recommendation. I will have 1 spare of each drive.
Initially the system came up with a dedicated root aggregate on controller 1 with three of the 900 GB drives and a dedicated root aggregate on controller 2 with three of the 4 TB drives.
Should I forget about dedicated root aggregates and just have a single aggregate for each controller?
If not, should I recreate the root aggregate on controller 2 with three of the 900 GB drives so I'm not using 12 TB for a root aggregate? If so, how do I get a root volume on a new aggregate?
As I see it have the following options:
1) A dedicated root aggregate on controller 1 and another aggregate of 44 drives with 1 spare - all 900 GB drives. A dedicated root aggregate on controller 2 and another aggregate of 20 drives with 1 spare - all 4 TB drives.
2) A dedicated root aggregate on controller 1 and another aggregate of 41 drives with 1 spare - all 900 GB drives. A dedicated root aggregate on controller 2 with three 900 GB drives and another aggregate of 23 drives with 1 spare of 4 TB drives.
3) No dedicated root aggregates. Controller 1 is one aggregate of 47 drives with 1 spare - all 900 GB drives. Controller 2 is one aggregate of 23 drives with 1 spare all 4 TB drives.
Thanks for your time and assistance.
Michael