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: Fri, 21 Oct 2011 10:24:15 +0000 (UTC) [thread overview]
Message-ID: <slrnja2i2f.5ku.stephane.chazelas@spam.is.invalid> (raw)
In-Reply-To: 20111021072826.Horde.qr6-I9JO7vlOoJJ63zcgY5A@mail.simonandkate.net
2011-10-21, 07:28(+10), Simon Wilson:
[...]
> If working with a NON-sparse VM img (i.e. originally created with
> virt-install --nonsparse), does a cp without --sparse=never retain the
> non-sparse nature of the file, or does it have to be specified?
[...]
See the man page for your "cp" command. The GNU implementation
of "cp" tries to replicate the sparseness of the files by
default, so if the source file wasn't sparse, the destination
shouldn't be either.
If in doubt, you can always use dd/cat/pv to avoid the extra
fancy hole punching that cp might or might not do.
--
Stephane
next prev parent reply other threads:[~2011-10-21 10:24 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 [this message]
2011-10-21 11:20 ` Gonzalo Marcote Peña
2011-10-20 14:56 ` Stephane CHAZELAS
2011-10-20 15:57 ` Stephane CHAZELAS
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