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Story: State-Isolated Hypervisor Architecture for Fedora Rawhide Server (Assisted by Google AI) Total Replies: 0
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dba477

Sep 03, 2026
9:02 AM EDT 		UPDATE as 10/13/26

Fedora 45 Server (nightly build as of 10/09/26 with KDE Plasma on top of it ) OverlayFS BTRFS setup works pretty stable on bare metal with BTRFS/XFS disk layout as shown below. However, Btrfs-Assistant behavior (e.g. stable recovery main instance via Overlay instances) in VENV significantly differs from Btrfs-Assistant functionality on bare metal. Content of file /etc/btrfs-assistant.conf is updated according to real subvolumes names generated during Anaconda Blivet GUI partition phase.

END UPDATE

UPDATE as of 09/27/26

Schema proposed below may be reproduced on bare metal

boris@Server45fedora:~$ uname -a
Linux Server45fedora 7.2.7-300.fc45.x86_64 #1 SMP PREEMPT_DYNAMIC Mon Sep 21 18:20:21 UTC 2026 x86_64 GNU/Linux
boris@Server45fedora:~$ findmnt -t btrfs
TARGET SOURCE                     FSTYPE OPTIONS
/      /dev/nvme0n1p7[/@-2]       btrfs  rw,relatime,seclabel,compress=zstd:1,ssd,discard=async,space_cache=v2,subvolid=272,subvol=/@-2
├─/.snapshots
│      /dev/nvme0n1p7[/snapshots-1]
│                                 btrfs  rw,relatime,seclabel,compress=zstd:1,ssd,discard=async,space_cache=v2,subvolid=256,subvol=/snapsho
├─/etc/libvirt/qemu
│      /dev/nvme0n1p7[/@qemu]     btrfs  rw,relatime,seclabel,compress=zstd:1,ssd,discard=async,space_cache=v2,subvolid=269,subvol=/@qemu
├─/home
│      /dev/nvme0n1p7[/@home-2]   btrfs  rw,relatime,seclabel,compress=zstd:1,ssd,discard=async,space_cache=v2,subvolid=257,subvol=/@home-2
├─/var/cache
│      /dev/nvme0n1p7[/@cache-2]  btrfs  rw,relatime,seclabel,compress=zstd:1,ssd,discard=async,space_cache=v2,subvolid=259,subvol=/@cache-
└─/var/log
       /dev/nvme0n1p7[/@log-2]    btrfs  rw,relatime,seclabel,compress=zstd:1,ssd,discard=async,space_cache=v2,subvolid=258,subvol=/@log-2
boris@Server45fedora:~$ sudo df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/nvme0n1p7 btrfs     281G  8.0G  271G   3% /
devtmpfs       devtmpfs   16G     0   16G   0% /dev
tmpfs          tmpfs      16G   96K   16G   1% /dev/shm
efivarfs       efivarfs  256K  237K   15K  95% /sys/firmware/efi/efivars
tmpfs          tmpfs     6.3G  2.3M  6.3G   1% /run
none           tmpfs     1.0M     0  1.0M   0% /run/credentials/systemd-journald.service
none           tmpfs     1.0M     0  1.0M   0% /run/credentials/systemd-resolved.service
/dev/nvme0n1p7 btrfs     281G  8.0G  271G   3% /.snapshots
/dev/nvme0n1p7 btrfs     281G  8.0G  271G   3% /etc/libvirt/qemu
tmpfs          tmpfs      16G  4.0K   16G   1% /tmp
/dev/nvme0n1p7 btrfs     281G  8.0G  271G   3% /var/cache
/dev/nvme0n1p7 btrfs     281G  8.0G  271G   3% /home
/dev/nvme0n1p7 btrfs     281G  8.0G  271G   3% /var/log
/dev/nvme0n1p5 ext4      2.0G  353M  1.5G  20% /boot
/dev/nvme0n1p4 vfat      599M  8.0M  591M   2% /boot/efi
/dev/nvme0n1p6 xfs       196G  8.4G  188G   5% /var/lib/libvirt/images
tmpfs          tmpfs     3.2G   96K  3.2G   1% /run/user/1000
However, decouple of @qemu subvolume (mounted on /etc/libvirt/qemu) was done in post installation phase

END UPDATE

UPDATE as of 09/15/2026

Fedora-Server-dvd-x86_64-45-20260915.n.0.iso keeps the same behavior as Beta1.3. What exactly I mean. Anaconda Blivet GUI creates in partition phase

boris@Server45fedora:~$ findmnt -t btrfs
TARGET              SOURCE                FSTYPE OPTIONS
/                   /dev/vda4[/@]         btrfs  rw,relatime,seclabel,compress=zstd:1,discard=async,space_cache=v2,subvolid=268,subvol=/@
├─/.snapshots       /dev/vda4[/snapshots] btrfs  rw,relatime,seclabel,compress=zstd:1,discard=async,space_cache=v2,subvolid=256,subvol=/snapshots
├─/etc/libvirt/qemu /dev/vda4[/@qemu]     btrfs  rw,relatime,seclabel,compress=zstd:1,discard=async,space_cache=v2,subvolid=257,subvol=/@qemu
├─/var/cache        /dev/vda4[/@cache]    btrfs  rw,relatime,seclabel,compress=zstd:1,discard=async,space_cache=v2,subvolid=259,subvol=/@cache
├─/home             /dev/vda4[/@home]     btrfs  rw,relatime,seclabel,compress=zstd:1,discard=async,space_cache=v2,subvolid=260,subvol=/@home
└─/var/log          /dev/vda4[/@log]      btrfs  rw,relatime,seclabel,compress=zstd:1,discard=async,space_cache=v2,subvolid=258,subvol=/@log

boris@Server45fedora:~$ lsblk -f
NAME   FSTYPE FSVER LABEL UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
sr0                                                                           
zram0  swap   1     zram0 4be4912f-3be1-4d14-b959-d298f4c0c117                [SWAP]
vda                                                                           
├─vda1 vfat   FAT32       0D17-2CE1                            1014.1M     1% /boot/efi
├─vda2 ext4   1.0         767ee00b-1b14-4374-8f75-3dc7294e9152    1.5G    17% /boot
├─vda3 xfs                64207f7c-70bc-432f-af88-1d40d57b74d5   43.1G     2% /var/lib/libvirt/images
└─vda4 btrfs              23aa74e4-b9eb-4d3b-81c8-34d9890aab3b   43.5G    12% /var/log
                                                                              /home
                                                                              /var/cache
                                                                              /etc/libvirt/qemu
                                                                              /.snapshots
                                                                              /
Downloaded from https://fedoraproject.org/wiki/Test_Results:Fedora_45_Branch...

END UPDATE

UPDATE as of 09/14/2026

As of now Fedora-Server-dvd-x86_64-Rawhide-20260914.n.0.iso ; Fedora-Server-dvd-x86_64-Rawhide-20260913.n.0.iso don't any longer support partitioning schema in this post However, Fedora-Server-dvd-x86_64-45_Beta-1.3.iso been rolled forward up to 09/14/26 still does

END UPDATE

Please, consult Google AI about content of the post. I also believe that TUX Machines is not the right place to evaluate the quality of post mentioned above. I may also confirm that Anaconda Blivet GUI power and flexibility are really amasing in meantime.

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