On Fri, 23 May 2014 00:34:25 +0200, Stefan G. Weichinger wrote: > > I'm working on this btrfs malarkey and have a question about best > > practice. It is recommended to leave the root volume empty and > > create a subvolume for the root filesystem which is set with btrfs > > subvolume set-default, which I have done. > > Alternative: mount the subvol via option "subvolid" etc in fstab .... if > you plan to mount different snapshots, for example.
I went with set-default for the root subvolume, if I need the root volume I can mount it with subvolid=0. > > What is the recommended way to create subvolumes that are mounted > > further down the filesystem? Let's say I was usr and var on their > > own subvolumes. Do I create them in the btrfs root, which means > > they have to be mounted from /etc/fstab - or do I create hem below > > the subvolume called root? > > I saw more examples mounting every dir via a > separate line in fstab (which also adds the choice to mount them with > different options, think compression etc). That makes sense, and will be useful should we ever get encryption. > My understanding is: > > * create and use subvols for entities you want to be able to snapshot > and rollback individually. > > * create and use subvols for entities you want to apply special > options to: compression, (no)COW, quota ... > > I would mount each subvol via extra line and create them in parallel ... That's what i ended up doing, thanks. I did have an issue with systemd failing to mount them because the correct symlinks hadn't been created when I run cryptsetup in the initramfs, because it doesn't use udev, but that was fairly easy to fix. > > That raises another question. Assuming I've done it wrong (well, my > > wife always does) is there an equivalent to the zfs rename command > > to move or rename a subvolume? > > As far as I understand you are allowed to mount the root volume (or > academic: any subvol in a higher level) and use plain "mv" to rename > the subvols as if you renamed sub-dirs. rust me to overlook the easy way of doing things, I was looking for an equivalent to "zfs rename" and never considered mv. So far, btrfs looks good on my laptop - time to think about putting it on my desktop. -- Neil Bothwick Ifyoucanreadthis,youspendtoomuchtimefiguringouttaglines.
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