Re: syntax for deleting subvolumes?

[Jeff Mahoney <jeffm@suse.com>]

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On 3/18/15 7:33 PM, Chris Murphy wrote:
> On Wed, Mar 18, 2015 at 5:01 PM, K Richard Pixley 
> <rpixley@graphitesystems.com> wrote:
> 
>> My complaint is a) about multiple subvols and b) about an
>> unnecessary and redundant subvol for the top level file system.
> 
> The current granularity supplied by root and home subvolumes is
> minor. Eventually there'd also be a boot subvolume too, but that's
> not supported yet due to a very old grubby bug that's like a booger
> that can't be flicked off.
> 
> openSUSE uses ~13 subvolumes by default, for an idea of much finer 
> granularity (which I don't like, personally, it's too much and
> really is unnecessary).

We use this layout in SLES too and it's necessary for both compliance
and principle-of-lease-surprise purposes in concert with our
snapshot-rollback facility. If you roll back your root file system,
would you really expect to lose all your logs? How about your mail? Do
you want snapshots of /tmp to hang around eating up disk space,
causing you to reduce the number of snapshots you can retain? Keeping
these as separate subvolumes also allows us to mount them seamlessly
when you boot from a snapshot to either recover or reset your system.

Does it look nice and neat? That's a matter of style. But the reasons
for having separate subvolumes are well thought out and completely
necessary.

BTW, going back to the original issue of why you'd even have a
separate non-top-level subvolume for root - if you boot from a
snapshot and choose to continue from there, you wouldn't be able to
remove the old "root" if it weren't a separate subvolume.

- -Jeff

- -- 
Jeff Mahoney
SUSE Labs
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