On Wed, Jul 24, 2024 at 7:28 AM George N. White III <gnw...@gmail.com> wrote:
> On Mon, Jul 22, 2024 at 11:21 PM Alex <mysqlstud...@gmail.com> 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. > > It looks like none of this functionality is available on RAID? I tried to install a new system with two SSDs, but once I tried to configure RAID1 using both disks, btrfs was no longer available as the filesystem. It would be really cool to have disk compression on RAID.
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