Re: [Qemu-devel] Re: qcow2 corruption observed, fixed by reverting old change

2009-02-14 Thread Marc Bevand
On Sat, Feb 14, 2009 at 2:28 PM, Dor Laor wrote: > > Both qcow2 and vmdk have the ability to keep 'external' snapshots. I know but they don't implement one feature I cited: clones, or "writable snapshots", which I would like implemented with support for deduplication. Base images / backing files

Re: [Qemu-devel] Re: qcow2 corruption observed, fixed by reverting old change

2009-02-14 Thread Jamie Lokier
Marc Bevand wrote: > On Fri, Feb 13, 2009 at 8:23 AM, Jamie Lokier wrote: > > > > Marc.. this is quite a serious bug you've reported. Is there a > > reason you didn't report it earlier? > > Because I only started hitting that bug a couple weeks ago after > having upgraded to a buggy kvm version

Re: [Qemu-devel] Re: qcow2 corruption observed, fixed by reverting old change

2009-02-14 Thread Jamie Lokier
Dor Laor wrote: > Both qcow2 and vmdk have the ability to keep 'external' snapshots. I didn't see any mention of this in QEMU's documentation. One of the most annoying features of qcow2 is "savevm" storing all VM snapshots in the same qcow2 file. Is this not true? > In addition to what you wrot

Re: [Qemu-devel] Re: qcow2 corruption observed, fixed by reverting old change

2009-02-14 Thread Dor Laor
Marc Bevand wrote: On Fri, Feb 13, 2009 at 8:23 AM, Jamie Lokier wrote: Marc.. this is quite a serious bug you've reported. Is there a reason you didn't report it earlier? Because I only started hitting that bug a couple weeks ago after having upgraded to a buggy kvm version. I

Re: [Qemu-devel] Re: qcow2 corruption observed, fixed by reverting old change

2009-02-13 Thread Marc Bevand
On Fri, Feb 13, 2009 at 8:23 AM, Jamie Lokier wrote: > > Marc.. this is quite a serious bug you've reported. Is there a > reason you didn't report it earlier? Because I only started hitting that bug a couple weeks ago after having upgraded to a buggy kvm version. > Is there a way to restructur

Re: [Qemu-devel] Re: qcow2 corruption observed, fixed by reverting old change

2009-02-13 Thread Chris Wright
* Jamie Lokier (ja...@shareable.org) wrote: > no reason to believe kvm-83 is "stable", but there's no reason to > believe any other version of KVM is especially stable either - there's > no stabilising bug fix only branch that I'm aware of. There's ad-hoc one w/out formal releases. But...never be

Re: [Qemu-devel] Re: qcow2 corruption observed, fixed by reverting old change

2009-02-13 Thread Jamie Lokier
Marc Bevand schrieb: > I tested kvm-81 and kvm-83 as well (can't test kvm-80 or older > because of the qcow2 performance regression caused by the default > writethrough caching policy) but it randomly triggers an even worse > bug: the moment I shut down a guest by typing "quit" in the monitor, > it