We have a question about how to rebuild the root volume.
We have a FAS 2020 filer with 2 controlers, it works on DATA ONTAP 18.104.22.168p1, there are 28 *300G FC disks in 2 FC disk shelves and 12* 1T SATA disks in main box, right now there are 2 aggregates(agg0 is a 14 FC disks agg and agg1 is a 6 SATA disks agg) in each controlers, and all root vol is on agg0 the FC disk agg.
Right now we want re-build the aggregates like this: assign all 28 FC disks in 1 agg on controler 1 and assign all 12 SATA disks in 1 agg on controler 2. this setting will offer more space and little bit logically than before.
We don't need care the data because there is no data at all on this filer, so our question is can we access this target and how?
Given you dont have any data on the filer and the configuration for the most part will be in /etc/rc and potentially /etc/hosts why dont you just rebuild it?
If you only assign the disks you want it to use for the root aggregate in maintenance mode it will install to these.
Troubleshooting this sounds like it will cost you alot more time that a simple reinstall although you will have to zero the disks.
1. Boot into maintenance mode
2. Destroy root aggregate
3. Unassign all disks
4. Assign disks you want to be the root aggregate for controller a
5. Ctrl C the boot and select 4a to reinstall
6. Restore /etc/rc etc as required.
7. Repeat process for controller b
The NDMP copy of thew root volume works and i have done a couple now, however something about your environment is causing you issues and i would suggest troubleshooting it will take you longer than a reinstall.