On Sat, 19 Mar 2022 at 19:01, Samuel Sieb <sam...@sieb.net> wrote: > On 3/19/22 14:48, George N. White III wrote: > > On Sat, 19 Mar 2022 at 16:14, Samuel Sieb <sam...@sieb.net > > <mailto:sam...@sieb.net>> wrote: > > > > On 3/19/22 05:18, George N. White III wrote: > > > Or just letting btrfs create over-sized "virtual partitions" and > > then > > > allocating > > > physical space as needed. > > > > btrfs doesn't do that. That's LVM thin-provisioning. > > > > > > Fresh install of Fedora 35 using default installation in the free space > > (after shrinking the OEM Windows partition, leaving a little over 400 > GB): > > > > % df -lhT | grep btrfs > > /dev/nvme0n1p6 btrfs 405G 89G 316G 22% / > > /dev/nvme0n1p6 btrfs 405G 89G 316G 22% /home > > % sudo pvs -a > > PV VG Fmt Attr PSize PFree > > /dev/nvme0n1p1 --- 0 0 > > /dev/nvme0n1p2 --- 0 0 > > /dev/nvme0n1p3 --- 0 0 > > /dev/nvme0n1p4 --- 0 0 > > /dev/nvme0n1p5 --- 0 0 > > /dev/nvme0n1p6 --- 0 0 > > /dev/sda1 --- 0 0 > > /dev/sda2 --- 0 0 > > /dev/sdb1 --- 0 0 > > /dev/sdb2 --- 0 0 > > > > So the 405G btrfs shows / and /home sharing the 405G, and no PV's for > > lvm to use. > > I don't know what you're trying to show there. "over-size virtual > partitions" is LVM thin-provisioning. btrfs in your case has used the > 405G partition and that's all the space that's available. It can be > used by any of the btrfs volumes, but any space that's used by one > volume is no longer available for the other ones. Every btrfs volume > shows the same size. > > If you meant something else by your initial comment, you'll need to > explain it. >
We are comparing the Fedora 35 default to manual partitioning. In btrfs terminology, /root is a top-level subvolume <https://btrfs.readthedocs.io/en/latest/Subvolumes.html> and /home is a . subvolume sharing storage with the top-level / filesystem. I just wanted point out that a default install doesn't need predetermined space requirements. Having said that, LVM helps adjust sizes based on in-use demands (but needs more steps to set up).. -- George N. White III
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