From stockhausen at collogia.de Thu Dec 19 07:54:16 2013 Content-Type: multipart/mixed; boundary="===============6124638222869435170==" MIME-Version: 1.0 From: Markus Stockhausen To: users at ovirt.org Subject: [Users] Clarification - Thin Disk Date: Thu, 19 Dec 2013 12:54:12 +0000 Message-ID: <12EF8D94C6F8734FB2FF37B9FBEDD173585B2712@EXCHANGE.collogia.de> --===============6124638222869435170== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable ------=3D_NextPartTM-000-a91c9107-4b77-48f8-9d90-42109529926d Content-Type: multipart/alternative; boundary=3D"_000_12EF8D94C6F8734FB2FF37B9FBEDD173585B2712EXCHANGEcollogi_" --_000_12EF8D94C6F8734FB2FF37B9FBEDD173585B2712EXCHANGEcollogi_ Content-Type: text/plain; charset=3D"iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello, could someone clarify the term "thin disk" in the context of Templates. Up to now for me a thin disk is space that is allocated on demand. But if I create VM from a template and use type "Thin" it must be a little bit different. The newly created VM will operate on the frozen template data plus some delta file that stores the changed block. Is that right? Shouldn't that be a "linked-disk"? Extra question: Why can't I move a (thin provisioned) template disk and instead have to copy it and delete it afterwards? Thanks in advance. Markus --_000_12EF8D94C6F8734FB2FF37B9FBEDD173585B2712EXCHANGEcollogi_ Content-Type: text/html; charset=3D"iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hello,

could someone clarify the term "thin disk" in the context of Temp= =3D lates.
Up to now for me a thin disk is space that is allocated on demand.

But if I create VM from a template and use type "Thin" it must be= =3D a
little bit different. The newly created VM will operate on the frozen
template data plus some delta file that stores the changed block.
Is that right? Shouldn't that be a "linked-disk"?

Extra question: Why can't I move a (thin provisioned) template disk
and instead have to copy it and delete it afterwards?

Thanks in advance.

Markus
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cnRUTS0wMDAtYTkxYzkxMDctNGI3Ny00OGY4LTlkOTAtNDIxMDk1Mjk5MjZkLS0KCg== --===============6124638222869435170==-- From iheim at redhat.com Thu Dec 19 16:43:22 2013 Content-Type: multipart/mixed; boundary="===============9034700408132226817==" MIME-Version: 1.0 From: Itamar Heim To: users at ovirt.org Subject: Re: [Users] Clarification - Thin Disk Date: Thu, 19 Dec 2013 16:43:17 -0500 Message-ID: <52B36875.4080201@redhat.com> In-Reply-To: 12EF8D94C6F8734FB2FF37B9FBEDD173585B2712@EXCHANGE.collogia.de --===============9034700408132226817== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On 12/19/2013 07:54 AM, Markus Stockhausen wrote: > Hello, > > could someone clarify the term "thin disk" in the context of Templates. > Up to now for me a thin disk is space that is allocated on demand. > > But if I create VM from a template and use type "Thin" it must be a > little bit different. The newly created VM will operate on the frozen > template data plus some delta file that stores the changed block. > Is that right? Shouldn't that be a "linked-disk"? thin doesn't mean it has a snapshot, only its not pre-allocating the = entire storage needed iirc. > > Extra question: Why can't I move a (thin provisioned) template disk > and instead have to copy it and delete it afterwards? just wasn't a prominent use case to implement i guess (would also need = to check no VMs/disks derive from the template of course). --===============9034700408132226817==--