From: Chris Murphy <lists@colorremedies.com>
To: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: RAID10 Balancing Request for Comments and Advices
Date: Tue, 16 Jun 2015 18:14:05 -0600 [thread overview]
Message-ID: <CAJCQCtRGxCr4GaVwkA0QpK8dYjhaBS0-rmi=ymPxycQiGUa_fg@mail.gmail.com> (raw)
In-Reply-To: <pan$966fb$92ec2f1c$291706f7$cf1b6c68@cox.net>
On Tue, Jun 16, 2015 at 5:58 PM, Duncan <1i5t5.duncan@cox.net> wrote:
> On a current kernel unlike older ones, btrfs actually automates entirely
> empty chunk reclaim, so this problem doesn't occur anything close to near
> as often as it used to. However, it's still possible to have mostly but
> not entirely empty chunks that btrfs won't automatically reclaim. A
> balance can be used to rewrite and combine these mostly empty chunks,
> reclaiming the space saved. This is what Hugo was recommending.
Yes, as little as a -dusage=5 (data chunks that are 5% or less full)
can clear the problem and is very fast, seconds. Possibly a bit
longer, many seconds o single digit minutes is -dusage=15. I haven't
done a full balance in forever.
--
Chris Murphy
next prev parent reply other threads:[~2015-06-17 0:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-16 12:09 RAID10 Balancing Request for Comments and Advices Vincent Olivier
2015-06-16 12:25 ` Hugo Mills
2015-06-16 13:34 ` Vincent Olivier
2015-06-16 23:58 ` Duncan
2015-06-17 0:14 ` Chris Murphy [this message]
2015-06-17 13:13 ` Vincent Olivier
2015-06-17 13:27 ` Hugo Mills
2015-06-17 13:29 ` Vincent Olivier
2015-06-18 4:37 ` Duncan
2015-06-17 13:46 ` Vincent Olivier
2015-06-18 8:00 ` Duncan
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