Thread (64 messages) 64 messages, 7 authors, 2016-09-22

Re: BTRFS constantly reports "No space left on device" even with a huge unallocated space

From: Jeff Mahoney <hidden>
Date: 2016-09-01 21:03:44

On 9/1/16 1:39 PM, Ronan Arraes Jardim Chagas wrote:
Hi Jeff,

Em Qui, 2016-09-01 às 13:12 -0400, Jeff Mahoney escreveu:
quoted
It's not.  We use qgroups because that's the only way we can track
how
much space each subvolume is using, regardless of whether anyone
wants
to do enforcement.  When it's working properly, snapper can make use
of
that information to make informed decisions on how much space will
actually be released when removing old snapshots.
Given that, what am I loosing by disabling qgroups here? Will I still
be able to recover my machine using snapshots (this saved my two or
three times)?
Absolutely.  It doesn't affect the ability to take, retain, or recover
using snapshots.  It only affects the ability to see how much space a
particular snapshot is using on disk, both from the user wanting to know
and snapper using it to make retention decisions.  Snapper can handle
qgroups not being there.

-Jeff

-- 
Jeff Mahoney
SUSE Labs

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