On web gui I can create a RAID1 pool with 2 or more disks (in my testcase SSD’s).
While using 2 disks the available space in the pool is that of one disk (approx).
But when using 3 disks I get a free space of 1,5 disk sizes (?).
It seems that metadata are distributed.
It is described, that in this case a failure of one disk can be handled.
I’d like to have all data on all 3 disks identically, that a failure of 2 disks can be tolerated.
How can I establish a RAID1 which is “fully” mirrored?
Can it be done via terminal?
What is the mkfs commandoption to do so (if its possible at all)?
ps: I read a lot of wiki paragraphs but I did nit found this case…
Thanks in advance!