That is no small feat, some real nice info here: https://wiki.archlinux.org/title/Bcachefs#Multi_Device_fstab
And you will need to install rEFInd it won’t boot on Grub
I had much better luck on Arch.
inxi -F|grep fs
Host: cachyos-bcahefs Kernel: 6.14.4-1-cachyos-bore arch: x86_64 bits: 64
IF-ID-2: surfshark_ipv6 state: unknown speed: N/A duplex: N/A
IF-ID-3: surfshark_wg state: unknown speed: N/A duplex: N/A mac: N/A
ID-1: / size: 215.7 GiB used: 36.23 GiB (16.8%) fs: bcachefs dev: /dev/sdc2
ID-2: /boot size: 2 GiB used: 524.6 MiB (25.7%) fs: vfat dev: /dev/sdc1
ls /boot
amd-ucode.img initramfs-linux-cachyos-bore-fallback.img refind_linux.conf
EFI initramfs-linux-cachyos-bore.img vmlinuz-linux-cachyos-bore
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
UUID=5F0E-B00D /boot vfat defaults 0 2
UUID=40b9e0e7-c926-4ae0-ab2c-76869b78d3be / bcachefs defaults,noatime 0 1
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
~
My mounts look like:
cat /proc/mounts
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
sys /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
dev /dev devtmpfs rw,nosuid,relatime,size=6951832k,nr_inodes=1737958,mode=755,inode64 0 0
run /run tmpfs rw,nosuid,nodev,relatime,mode=755,inode64 0 0
efivarfs /sys/firmware/efi/efivars efivarfs rw,nosuid,nodev,noexec,relatime 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
/dev/sdc2 / bcachefs rw,noatime, 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev,inode64 0 0
cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
bpf /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=40,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=10073 0 0
debugfs /sys/kernel/debug debugfs rw,nosuid,nodev,noexec,relatime 0 0
mqueue /dev/mqueue mqueue rw,nosuid,nodev,noexec,relatime 0 0
tracefs /sys/kernel/tracing tracefs rw,nosuid,nodev,noexec,relatime 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,nosuid,nodev,relatime,pagesize=2M 0 0
fusectl /sys/fs/fuse/connections fusectl rw,nosuid,nodev,noexec,relatime 0 0
configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /run/credentials/systemd-resolved.service tmpfs ro,nosuid,nodev,noexec,relatime,nosymfollow,size=1024k,nr_inodes=1024,mode=700,inode64,noswap 0 0
tmpfs /tmp tmpfs rw,noatime,inode64 0 0
/dev/sdc1 /boot vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro 0 0
tmpfs /run/credentials/systemd-journald.service tmpfs ro,nosuid,nodev,noexec,relatime,nosymfollow,size=1024k,nr_inodes=1024,mode=700,inode64,noswap 0 0
tmpfs /run/user/1000 tmpfs rw,nosuid,nodev,relatime,size=1415260k,nr_inodes=353815,mode=700,uid=1000,gid=1000,inode64 0 0
gvfsd-fuse /run/user/1000/gvfs fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0
/dev/sde1 /run/media/me/Ventoy exfat rw,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0022,dmask=0022,iocharset=utf8,errors=remount-ro 0 0
portal /run/user/1000/doc fuse.portal rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0
run /run/firejail/dbus tmpfs rw,nosuid,nodev,noexec,relatime,mode=755,inode64 0 0
run /run/firejail/firejail.ro.dir tmpfs ro,nosuid,nodev,relatime,mode=755,inode64 0 0
run /run/firejail/firejail.ro.file tmpfs ro,nosuid,nodev,relatime,mode=755,inode64 0 0
/dev/sdd1 /run/media/me/Crucial-1TB ext4 rw,nosuid,nodev,relatime,errors=remount-ro 0 0