With Ceph, you need fast networking for your Storage, 10 Gbit should be the absolute minimum, better 25 or 40 Gbit.
Your data will be on all 3 nodes for redundancy, if one node fails you can still work, if 2 Nodes fail your ceph is no longer...
zpool-rename.md:
rpool is the original, zp_pve the new pool name
# Rescue System booten
zpool import rpool zp_pve -R /mnt -f
for i in proc sys dev run; do mount -o bind /$i /mnt/$i ; done
chroot /mnt
rm /etc/default/grub.d/zfs.cfg
sed -i...