From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx15.extmail.prod.ext.phx2.redhat.com [10.5.110.20]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r0P8iGw3015718 for ; Fri, 25 Jan 2013 03:44:16 -0500 Received: from diomedes.noc.ntua.gr (diomedes.noc.ntua.gr [147.102.222.220]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r0P8iBkn001235 for ; Fri, 25 Jan 2013 03:44:12 -0500 Date: Fri, 25 Jan 2013 10:44:10 +0200 From: Vangelis Koukis Message-ID: <20130125084410.GB10563@daedalus.cslab.ece.ntua.gr> References: <20130124155312.GA10563@daedalus.cslab.ece.ntua.gr> <20130124180834.GA3122@agk-dp.fab.redhat.com> <51017F0C.20100@bmsi.com> <20130124234235.GB3122@agk-dp.fab.redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="qlTNgmc+xy1dBmNv" Content-Disposition: inline In-Reply-To: <20130124234235.GB3122@agk-dp.fab.redhat.com> Subject: Re: [linux-lvm] Sparse LVs, --virtualsize equal to --size Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: To: LVM general discussion and development Cc: synnefo-devel@googlegroups.com --qlTNgmc+xy1dBmNv Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jan 24, 2013 at 11:42:35pm +0000, Alasdair G Kergon wrote: > So look at thin provisioning with its zeroing option. > External origin. (support currently being added to lvm) >=20 > Or this not-yet-upstream target: > http://people.redhat.com/agk/patches/linux/editing/dm-add-zeroed-target.p= atch >=20 > Alasdair Thanks Alasdair, this seems to fit the bill perfectly, it's a shame it's not yet merged upstream. Until then, if we are to go with the "snapshot-over-the-zero-target" route, can you comment on quantifying the space overhead of tracking chunks in the snapshot? Thanks again, Vangelis. --=20 Vangelis Koukis vkoukis@grnet.gr OpenPGP public key ID: pub 1024D/1D038E97 2003-07-13 Vangelis Koukis Key fingerprint =3D C5CD E02E 2C78 7C10 8A00 53D8 FBFC 3799 1D03 8E97 Only those who will risk going too far can possibly find out how far one can go. -- T.S. Eliot --qlTNgmc+xy1dBmNv Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAlECRdoACgkQ+/w3mR0Djpc8QwCgjSRletFjquTycBeA+YYRg9aJ d98AoKgR5r8lGBGlSmPLYhCYLLSJ+9qS =w0mj -----END PGP SIGNATURE----- --qlTNgmc+xy1dBmNv--