At some point in the last couple of Fedora releases, it was decided to
eliminate /sbin and /bin and use /usr/sbin and /usr/bin instead. For
compatibility, there are symbolic links in the root for bin -> /usr/bin
and sbin -> /usr/sbin. Great! Do not have to worry anymore about the
different locations for programs. BTW, a similar thing is done for /lib
and /lib64.
Really simplifying things.
BUT (and here is the rub) anaconda (in rawhide) lets you put /usr on a
separate BTRFS subvolume but it will not let you put /etc on a separate
subvolume.
IIRC, the idea of /sbin and /bin (as well as /etc) was that it had to be
there for the system to bootup and if it was on a separate partition,
that could not be guarenteed. I am equating partition and subvolume as
equivalent.
If I can put /usr on a different subvolume which will include /usr/bin,
/usr/sbin, /usr/lib, and /usr/lib64, then I should be able to put /etc
on a separate subvolume and anaconda should be enhanced to permit it.
On the other hand, if I need all of those directories, then anaconda has
a bug and should be updated to disallow putting /usr on a separate
subvol or partition or LVMlv.
My reason for bring this up is that I recently screwed up one of my
systems and had to reinstall. Well, asside from the OS itself, I did
have backups for /home and my development directories which are on
separate BTRFS subvolumes.
To do backups, I use btrfs-snapshot and then btrfs-send for a baseline
or delta. This proved to work well. I simply had the do btrfs-receive
the baseline and install it in the new btrfs-filesystem. Then do
another btrfs-receive for the delta.. Since both the restored snapshots
are r/o, I could then do a new btrfs-snapshot to r=create a r/w subvol.
When I realized how well this worked and how easy it was to do, I wanted
to do the same thing for /etc becuase I change a lot of stuff in it such
as /etc/libvirt definitions.
OK, is putting /usr on a different btrfs subvol a bug or a feature?
Gene
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