Newbie guide for X6-2S?

Not sure where else to ask, but wrapping my head around this is challenging, given available documentation.  We're on the latest 12.1.2.10, and docs continue to have references seemingly intended for other system models, not the X6-2S.  "oakcli" is mentioned prominently, but not "odacli" (which actually exists).  The minimal mentions of storage say nothing about how I'm expected to use it: somehow carve out my own LVM physical disks from the NVMe?; what's up with the default 5GB ACFS "commonstore" even though I specified ASM only?; if mirrored NVMe means I should have 3.2 TB usable, where is it os-wise?