Re: [opensuse] Re: btrfs (with subvolumes) & raid-1 setup

On 11/22/2014 10:03 AM, Gour wrote:

On Sat, 22 Nov 2014 09:23:22 -0500 Anton Aylward wrote:

...

If the ROOT FS is the root then there's no sense it it also being a subvolume

Well, the whole setup is cleaner and allows one to e.g. mount one's root to some other place, but I was not aware if there is some gotcha in regard to snapshots.

Each BtrFS has its own If, for example, as I once tried, you have /home in a separate container as a quite separate BtrFS you can mount it on /home on the root FS. It doesn't matter if the root FS is a BtrFS or not, and if it is it doesn't matter if the /home directory on the root FS is a subvolume or not as the mount of the external will, as is the case with any FS combination, overlay it. As it happened, when I tried that I _initially_ had the /home on the root at a subvolume, then unmounted the second drive, removed the subvolume, created a new /hone directory *which of course had nothing in it) and remounted /home. All was fine. You can configure the snapshot for each FS independently. The "cleaner" makes no sense to me. As for mount .... For quite another reason I once had to boot in maintenance mode and had a RAMFS and mounted my BtrFS containing the system on the RAMFS/mount, and did the other stuff needed so I could do a chroot. The RAMFS's fstab had no information about the BtrFS; the mount was from a manually entered command line. What I'm saying is that as far as mounting the 'ROOTFS' goes it being a BtrFS and having subvolumes MAKES NO DIFFERENCE AT ALL So there is no reason to have the root of the FS as a subvolume in the fstab.

...

A subvolume of what?

Of btrfs filesystem.

But it *IS* the root of the BtrFS. What you are trying to do is declare that the fs is subvolme of itself. The reality of subvolume-ness lies not in what is in the /etc/fstab but in what the FS thinks it has. You have the 12.3 installed? Try btrfs subvolume list -aqt / -- /"\ \ / ASCII Ribbon Campaign X Against HTML Mail / \ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org