From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Blake Subject: Re: [Qemu-devel] Are there plans to achieve ram live Snapshot feature? Date: Fri, 09 Aug 2013 09:51:42 -0600 Message-ID: <5205100E.60007@redhat.com> References: <33FB050264B7AD4DBD6583581F2E03104B764728@nkgeml511-mbx.china.huawei.com> <877gfu3m25.fsf@codemonkey.ws> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="0C26arUE2NsreIrqwMeaQrTXkiqLo8J4O" Cc: Chijianchun , "paul@codesourcery.com" , "kvm@vger.kernel.org" , "mtosatti@redhat.com" , "qemu-devel@nongnu.org" To: Anthony Liguori Return-path: Received: from mx1.redhat.com ([209.132.183.28]:41928 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S967877Ab3HIPvt (ORCPT ); Fri, 9 Aug 2013 11:51:49 -0400 In-Reply-To: <877gfu3m25.fsf@codemonkey.ws> Sender: kvm-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --0C26arUE2NsreIrqwMeaQrTXkiqLo8J4O Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 08/09/2013 09:45 AM, Anthony Liguori wrote: > Chijianchun writes: >=20 >> Now in KVM, when RAM snapshot, vcpus needs stopped, it is Unfriendly r= estrictions to users. >> >> Are there plans to achieve ram live Snapshot feature? >=20 > I think you mean a live version of the savevm command. >=20 > You can approximate live migrating to a file, creating an external disk= > snapshot, then resuming the guest. And libvirt does just that, since libvirt 1.0.5, for its external RAM snapshots. The vcpu pause is a mere fraction of a second, so it is generally not noticeable as any guest downtime. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --0C26arUE2NsreIrqwMeaQrTXkiqLo8J4O Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (GNU/Linux) Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJSBRAOAAoJEKeha0olJ0Nqrn8IAJKfchMG2RrbiqU4ri44mowr 75/4b7JpXV0IawvalsZX4BhIbIxpjlvTrfeS1yzTmW9V40uvGHxA9OQ2vV9VW0oN JmQoQTJ6LyzRbFWgGxUL+G1s4EvaRz2z2iGdI0fVtHmDikI9J4YDliH2R2RDKzEj wk6btNKBXJ0uc/J9QYRlikWWmVn1yzXtYEDt/wEKKLQTsQea27jlY2Q2YO8DKaOJ MfOf9a89/3XzudsRHcQUxDe3IppUunTXWiHJHJJOyklCBMVZsSAm/XgJIna3ft0V 5BiTrGNQx3Cgx0NR6D+fldP/KvLBTgPhsuvWD6PlgLwSQlYTnGClAxuiFgeLdJ0= =QZr9 -----END PGP SIGNATURE----- --0C26arUE2NsreIrqwMeaQrTXkiqLo8J4O--