Hi!
I've read the explanation about how much space is available using disks with different sizes[1]. I understand the rules, but I see a contradiction with definition of RAID-1 in btrs:
«A form of RAID which stores two complete copies of each piece of data. Each copy is stored on a different device. btrfs requires a minimum of two devices to use RAID-1. This is the default for btrfs's metadata on more than one device.
So, let's say we have 3 small disks: 4GB, 3G, and 2GB.
If I create one file of 3GB I think that
3 GB is written on 4GB disk, it leaves 1 GB free.
3 GB of copy is written on 3 GB disk, it leaves 0 GB Free.
So, I create one file of 1GB that is written on 4GB disk, it leaves 0 GB free.
1 GB of copy is written on 2 GB disk, so it leaves 1 GB free.
So I've used 4GB, ok it leaves 1 GB free on only one disk, but cannot be mirrored.
However as [1] I could use 4.5 ((4GB+3GB+2GB)/2) GB instead of 4GB. Surely, I'm missing or mistaking something.
Please could you help me?
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