Debian forky OverlayFS BTRFS/XFS setup

Posted by dba477 on Oct 15, 2026 7:25 PM EDT
https://dbaxps.blogspot.com; By Boris Derzhavets 		Mail this story
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One more option provided is recovery main instance via booting into Overlay instance using Grub Submenu. By explicitly mounting the top-level Btrfs volume (subvolid=5) into a temporary directory like /mnt, you step outside the overlay's jurisdiction. This allows the kernel to recognize the true Btrfs layout and perform instant atomic subvolume swaps. 

sudo mount -o subvolid=5   /dev/vda4   /mnt
sudo btrfs subvolume list   /mnt/@
sudo mv   /mnt/@  /mnt/@_broken
sudo btrfs subvolume snapshot /mnt/@snapshots/snap-ID/snapshot  /mnt/@
sudo btrfs subvolume  delete   /mnt/@_broken

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