From jhorne at skopos.us Wed Mar 13 17:23:07 2013 Content-Type: multipart/mixed; boundary="===============8257976972866416124==" MIME-Version: 1.0 From: Jonathan Horne To: users at ovirt.org Subject: [Users] re-thin a disk Date: Wed, 13 Mar 2013 21:23:04 +0000 Message-ID: <9BE6F493F83A594DA60C45E6A09DC5AC23B81776@AUSP01DAG0201> --===============8257976972866416124== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable --_000_9BE6F493F83A594DA60C45E6A09DC5AC23B81776AUSP01DAG0201_ Content-Type: text/plain; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable I have a virtual machine with a 500GB thin-provisioned disk, and on it is a= =3D bout 2GB of data. Due to a pvmove operation I am running, the 500GB disk w= =3D ith 2GB of data is growing and growing and is currently 180GB in size, and = =3D im sure it will go all the way to the 500GB before it stops. When this process is finished, is there a way to re-thin the disk back down= =3D to the proper size again? What about the export/import process? Would th= =3D at export it to the data size, not the block size? Thanks, jonathan ________________________________ This is a PRIVATE message. If you are not the intended recipient, please de= =3D lete without copying and kindly advise us by e-mail of the mistake in deliv= =3D ery. NOTE: Regardless of content, this e-mail shall not operate to bind SKO= =3D POS to any order or other contract unless pursuant to explicit written agre= =3D ement or government initiative expressly permitting the use of e-mail for s= =3D uch purpose. --_000_9BE6F493F83A594DA60C45E6A09DC5AC23B81776AUSP01DAG0201_ Content-Type: text/html; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable

I have a virtual machine with a 500GB thin-provisi= on=3D ed disk, and on it is about 2GB of data.  Due to a pvmove operation I = =3D am running, the 500GB disk with 2GB of data is growing and growing and is c= =3D urrently 180GB in size, and im sure it will go all the way to the 500GB before it stops.

 

When this process is finished, is there a way to r= e-=3D thin the disk back down to the proper size again?  What about the expo= =3D rt/import process?  Would that export it to the data size, not the blo= =3D ck size?

 

Thanks,

jonathan


This is a PRIVATE mess= age. I=3D f you are not the intended recipient, please delete without copying and kin= =3D dly advise us by e-mail of the mistake in delivery. NOTE: Regardless of con= =3D tent, this e-mail shall not operate to bind SKOPOS to any order or other contract unless pursuant to explicit wri= =3D tten agreement or government initiative expressly permitting the use of e-m= =3D ail for such purpose. --_000_9BE6F493F83A594DA60C45E6A09DC5AC23B81776AUSP01DAG0201_-- --===============8257976972866416124== Content-Type: multipart/alternative MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="attachment.bin" LS1fMDAwXzlCRTZGNDkzRjgzQTU5NERBNjBDNDVFNkEwOURDNUFDMjNCODE3NzZBVVNQMDFEQUcw MjAxXwpDb250ZW50LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9InVzLWFzY2lpIgpDb250ZW50 LVRyYW5zZmVyLUVuY29kaW5nOiBxdW90ZWQtcHJpbnRhYmxlCgpJIGhhdmUgYSB2aXJ0dWFsIG1h Y2hpbmUgd2l0aCBhIDUwMEdCIHRoaW4tcHJvdmlzaW9uZWQgZGlzaywgYW5kIG9uIGl0IGlzIGE9 CmJvdXQgMkdCIG9mIGRhdGEuICBEdWUgdG8gYSBwdm1vdmUgb3BlcmF0aW9uIEkgYW0gcnVubmlu ZywgdGhlIDUwMEdCIGRpc2sgdz0KaXRoIDJHQiBvZiBkYXRhIGlzIGdyb3dpbmcgYW5kIGdyb3dp 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Jones To: users at ovirt.org Subject: Re: [Users] re-thin a disk Date: Fri, 15 Mar 2013 17:23:24 +0000 Message-ID: <20130315172324.GA22371@rhmail.home.annexia.org> In-Reply-To: 9BE6F493F83A594DA60C45E6A09DC5AC23B81776@AUSP01DAG0201 --===============7506733794902524497== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On Wed, Mar 13, 2013 at 09:23:04PM +0000, Jonathan Horne wrote: > I have a virtual machine with a 500GB thin-provisioned disk, and on > it is about 2GB of data. Due to a pvmove operation I am running, > the 500GB disk with 2GB of data is growing and growing and is > currently 180GB in size, and im sure it will go all the way to the > 500GB before it stops. > > When this process is finished, is there a way to re-thin the disk > back down to the proper size again? What about the export/import > process? Would that export it to the data size, not the block size? There's not a way to do this in-place currently, although we're working on it. If you can accept a copy, then 'qemu-img convert' will automatically sparsify disks, although it only works if there is no left-over data in the blocks. Also requiring a copy, virt-sparsify can fully sparsify a disk even if it has left-over but unused data blocks. See also: http://libguestfs.org/virt-sparsify.1.html http://libguestfs.org/guestfs-faq.1.html#why-doesnt-virt-sparsify-work-on= -the-disk-image-in-place- - - - Your question also made me wonder if there was a tool to do an in-place sparsification of a thin provisioned DM device, but there doesn't seem to be anything for that. *If* such a tool did exist, then you could use it in conjunction with the following guestfish command: http://libguestfs.org/guestfish.1.html#zero-free-space ie. something like: guestfish -a /dev/vg/guest > run > list-filesystems # for each filesystem do: > mount /dev/XXX / > zero-free-space / > umount / followed by running the non-existent thinning tool. Rich. -- = Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjon= es virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v --===============7506733794902524497==--