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