Hello,
I'm sharing a btrfs-formatted drive between multiple computers and each
of the machines has a separate home directory on that drive. The root of
the drive is mounted at /mnt/tray and the home directory for machine
{hostname} is under /mnt/tray/Homes/{hostname}. Up until now, I have
mounted /mnt/tray like a normal volume and then did an additional
bind-mount of /mnt/tray/Homes/{hostname} to /home.
Now I have a new drive and wanted to do things a bit more advanced by
creating subvolumes for each of the machines' home directories so that I
can also do independent snapshotting. I guess I could use the bind-mount
method like before but my question is if it is considered safe to do an
additional, "regular" mount of one of the subvolumes to /home instead, like
mount /dev/sdxN /mnt/tray
mount -o subvol=/Homes/{hostname} /dev/sdxN /home
When I experimented with such additional mounts of subvolumes of
already-mounted volumes, I noticed that the mount options of the
additional subvolume mount might differ from the "original" mount. For
instance, the root volume might be mounted with "noatime" while the
subvolume mount may have "relatime".
So my questions are: Is mounting a subvolume of an already mounted
volume considered safe and are there any combinations of possibly
conflicting mount options one should be aware of (compression,
autodefrag, cache clearing)? Is it advisable to use the same mount
options for all mounts pointing to the same physical device?
Best regards,
Sebastian
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