On Mon, Jul 22, 2024 at 11:21 PM Alex <[email protected]> wrote:

> Hi,
>
> I've used fedora since it was called Red Hat, but this is the first time
> I've seen disk compression and mounting the same partition on multiple
> mount points.
>
> Can someone help me understand what's happening here?
>
> UUID=832cbf4d-a17f-457d-b768-bd5c1a26bf86 /                       btrfs
> subvol=root,compress=zstd:1 0 0
> UUID=a3e1f06d-f666-442f-9cd5-4d2833552e9c /boot                   ext4
>  defaults        1 2
> UUID=832cbf4d-a17f-457d-b768-bd5c1a26bf86 /home                   btrfs
> subvol=home,compress=zstd:1 0 0
>
> This is the fstab from my new default fedora40 server install. Why is it
> mounting /dev/sda3 (PERC RAID5) on both root and home?
>

> I'm also curious about the real-time disk compression. I wasn't aware it
> could be used on the root filesystem.
>

https://btrfs.readthedocs.io/en/latest/Compression.html

>
> I have another fedora38 server that I plan to upgrade shortly. Can I
> perform an update in place to do the same with my fedora38 server and xfs
> or it is only supported on btrfs?
>
> What is the benefit of mounting the same partition on multiple mount
> points?
>


This one of the benefits of btrfs -- root and home are btrfs sub-volumes.
They share the space of the the parent volume, so
inexperienced users don't end up with lots of free space one one partition
and no free space on another.


-- 
George N. White III
-- 
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