From: Chris Mason <chris.mason@oracle.com>
To: Andreas Philipp <philipp.andreas@gmail.com>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Btrfs balance
Date: Thu, 20 Jan 2011 16:31:20 -0500 [thread overview]
Message-ID: <1295558587-sup-5042@think> (raw)
In-Reply-To: <4D38338B.3090903@gmail.com>
Excerpts from Andreas Philipp's message of 2011-01-20 08:07:23 -0500:
>
> Hi,
>
> Maybe it is a very stupid question but I want to ask it anyway. In
> general, 'btrfs filesystem balance' takes very long to finish and
> produces lots of IO. So what are the classical usage scenarios, when
> it is (really) worth doing a balance?
The idea behind the balance is to spread the used space across all your
drives evenly. So you would usually run it after adding a new drive.
It's also useful if your disk has a lot of space allocated to either
data or metadata and you want to return to a more reasonable default.
Josef has a patch to do this more dynamically that we're fixing up
(hopefully for 2.6.38-rc2).
In general, it isn't something that you want to do very often.
-chris
next prev parent reply other threads:[~2011-01-20 21:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-20 13:07 Btrfs balance Andreas Philipp
2011-01-20 13:39 ` Hugo Mills
[not found] ` <4D384C75.5090202@gmail.com>
2011-01-20 15:09 ` Hugo Mills
2011-01-20 13:40 ` Helmut Hullen
2011-01-20 17:46 ` Hubert Kario
2011-01-20 21:31 ` Chris Mason [this message]
-- strict thread matches above, loose matches on Subject: below --
2011-01-20 14:58 Tomasz Chmielewski
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