From mboxrd@z Thu Jan 1 00:00:00 1970 From: "kevin.zhang@octlink.com" Subject: Live Snapshot problem: Xen 4.4+ with qcow2 disk Date: Fri, 18 Jul 2014 18:26:33 +0800 Message-ID: <20140718182632758532107@octlink.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============5499287702178910837==" Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel List-Id: xen-devel@lists.xenproject.org This is a multi-part message in MIME format. --===============5499287702178910837== Content-Type: multipart/alternative; boundary="----=_001_NextPart122143810351_=----" This is a multi-part message in MIME format. ------=_001_NextPart122143810351_=---- Content-Type: text/plain; charset="GB2312" Content-Transfer-Encoding: base64 SGkgYWxsLA0KDQogICAgVG9kYXksIEkgdHJpZWQgdG8gdGVzdCB3aGV0aGVyIExpdmUgU25hcHNo b3Qgc2NoZW1hIGNhbiBiZSBhZG9wdGVkIHRvIHFlbXUteGVuIHdpdGggcWNvdzIgZGlzayBpbWFn ZSBhcw0Kd2hhdCB3ZSBkbyB3aXRoIHFlbXUteGVuLXRyYWRpdGlvbmFsIHVzaW5nIHZoZCBkaXNr IGltYWdlLg0KICAgIE15IGxpdmUgc25hcHNob3QgcHJvY2VkdXJlIGlzIGFzIGZvbGxvdzoNCigg bXkgdm0xIGlzIGN1cnJlbnRseSBydW5uaW5nIHdpdGggcWNvdzIgZGlzayBmaWxlIDEucWNvdzIg KSANCiAxLiB4bCBwYXVzZSB2bTENCiAyLiBtdiAxLnFjb3cyIHNuYXAucWNvdzINCiAzLiBxZW11 LWltZyBjcmVhdGUgIC1iIHNuYXAucWNvdzIgLWYgcWNvdzIgMS5xY293Mg0KIDQuIHhsIHVucGF1 c2Ugdm0xDQoNCiAgIEhvd2V2ZXIsIGFzIEkgdW5wYXVzZWQgdm0xLCB0aGUgd3JpdGUgb3BlcmF0 aW9uIHN0aWxsIHdlbnQgdG8gc25hcC5xY293MiBpbnN0ZWFkIG9mICB0aGUgbmV3bHkgY3JlYXRl ZCBzbmFwc2hvdCBmaWxlIDEucWNvdzIuDQpJIHJlbWVtYmVyIHRoYXQgeGVuIDQuMCBhbHNvIGhh ZCBzaW1pbGFyIHByb2JsZW0gaWYgd2UgZGlkIHZoZCBsaXZlIHNuYXBzaG90LCBhbmQgdGhlIHBy b2JsZW0gd2FzIGZpeGVkIGluIHhlbiA0LjEuDQogICBNeSBxdWVzdGlvbiBpcyA6IHdoZXRoZXIg dGhlIGZhaWx1cmUgb2YgbWFraW5nIGxpdmUgcWNvdzIgc25hcHNob3QgaXMgYSBrbm93biBidWcs IG9yICB3aGV0aGVyIEkndmUgbWlzc2VkIHNvbWUga2V5IG9wZXJhdGlvbnMgdG8gbWFrZSBpdCB3 b3JrLg0KDQoNCg0KDQoNCkJlc3QgUmVnYXJkcw== ------=_001_NextPart122143810351_=---- Content-Type: text/html; charset="GB2312" Content-Transfer-Encoding: quoted-printable

Hi all,

Today, I tried to test whether Live Snapshot schem= a can=20 be adopted to qemu-xen with qcow2 disk image as

what we do with qemu-xen-traditional using vhd disk image.

My live snapshot procedure is as follow:

( my vm1 is currently running with qcow2 disk file 1.qcow2=20 )

1. xl pause vm1

2. mv 1.qcow2 snap.qcow2

3. qemu-img create -b snap.qcow2 -f qcow2 1.qcow2

4. xl unpause vm1

However, as I unpaused vm1, the write operation still we= nt to=20 snap.qcow2 instead of the newly created snapshot file 1.qcow2.

I remember that xen 4.0 also had similar problem if we did vhd live=20 snapshot, and the problem was fixed in xen 4.1.

My question is : whether the failure of making live qcow= 2=20 snapshot is a known bug, or whether I've missed some key operations = to=20 make it work.

Best=20 Regards

------=_001_NextPart122143810351_=------ --===============5499287702178910837== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel --===============5499287702178910837==--