From: Stephane CHAZELAS <stephane_chazelas@yahoo.fr>
To: kvm@vger.kernel.org
Subject: Re: Convert one .img disk created with sparse=true to no sparse
Date: Thu, 20 Oct 2011 15:57:44 +0000 (UTC) [thread overview]
Message-ID: <slrnja0h7o.i8d.stephane.chazelas@spam.is.invalid> (raw)
In-Reply-To: slrnja0dl8.h81.stephane.chazelas@spam.is.invalid
2011-10-20, 14:56(+00), Stephane CHAZELAS:
[...]
> On extent based FS (ext4, btrfs...), there might be a way to
> guarantee as few extents as possible, but I don't know it.
Actually, with both ext4 and btrfs, it is possible to defrag a
file in place. So you could un-sparse the file first:
make sure it is not being used otherwise and:
cat < old.img 1<> old.img
or
pv < old.img 1<> old.img
to get a progress bar.
and defrag it:
e4defrag -v old.img
btrfs filesystem defragment -v old.img
(not tested).
--
Stephane
prev parent reply other threads:[~2011-10-20 15:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-20 11:21 Convert one .img disk created with sparse=true to no sparse Gonzalo Marcote Peña
2011-10-20 14:43 ` Stefan Hajnoczi
2011-10-20 21:28 ` Simon Wilson
2011-10-21 10:24 ` Stephane CHAZELAS
2011-10-21 11:20 ` Gonzalo Marcote Peña
2011-10-20 14:56 ` Stephane CHAZELAS
2011-10-20 15:57 ` Stephane CHAZELAS [this message]
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