On Tue, Feb 21, 2012 at 4:01 PM, Markus Armbruster wrote:
> Anthony Liguori writes:
>
>> On 02/07/2012 07:50 AM, Stefan Hajnoczi wrote:
>>> On Tue, Feb 7, 2012 at 1:34 PM, Kevin Wolf wrote:
Am 07.02.2012 11:29, schrieb Ori Mamluk:
> Repagent is a new module that allows an external repli
Anthony Liguori writes:
> On 02/07/2012 07:50 AM, Stefan Hajnoczi wrote:
>> On Tue, Feb 7, 2012 at 1:34 PM, Kevin Wolf wrote:
>>> Am 07.02.2012 11:29, schrieb Ori Mamluk:
Repagent is a new module that allows an external replication system to
replicate a volume of a Qemu VM.
>>
>> I rec
On Wed, Feb 8, 2012 at 2:55 PM, Paolo Bonzini wrote:
> On 02/08/2012 03:39 PM, Stefan Hajnoczi wrote:
>>
>>
>>> > What about taking the existing Ceph/RBD driver in QEMU and changing it
>>> > to
>>> > support arbitrary image formats rather than just raw? That sounds
>>> > much much
>>> > easier
On 02/08/2012 03:39 PM, Stefan Hajnoczi wrote:
> What about taking the existing Ceph/RBD driver in QEMU and changing it to
> support arbitrary image formats rather than just raw? That sounds much much
> easier. The main advantage is that Ceph has a user-space library for use in
> the repl
On Wed, Feb 8, 2012 at 12:46 PM, Paolo Bonzini wrote:
> On 02/08/2012 01:03 PM, Stefan Hajnoczi wrote:
>>
>> If you intend to run an unmodified drbd server on the rephub, then it
>> may not be possible to get point-in-time backups. (Although this
>> probably depends since things like btrfs or zfs
On 02/08/2012 01:03 PM, Stefan Hajnoczi wrote:
If you intend to run an unmodified drbd server on the rephub, then it
may not be possible to get point-in-time backups. (Although this
probably depends since things like btrfs or zfs may allow you to get
back to arbitrary transactions or timestamps.
On 02/07/2012 04:45 PM, Ori Mamluk wrote:
> On 07/02/2012 15:34, Kevin Wolf wrote:
>> Am 07.02.2012 11:29, schrieb Ori Mamluk:
>>> Repagent is a new module that allows an external replication system to
>>> replicate a volume of a Qemu VM.
>>>
>>> This RFC patch adds the repagent client module to Qe
On 02/07/2012 04:05 PM, Paolo Bonzini wrote:
> On 02/07/2012 02:50 PM, Stefan Hajnoczi wrote:
>>> I guess we might need to attach multiple QMP monitors for this to work
>>> (one for libvirt, one for the rephub). I'm not sure if there is a
>>> fundamental problem with this or if it just needs to be
On Wed, Feb 8, 2012 at 6:10 AM, Ori Mamluk wrote:
> On 07/02/2012 17:47, Paolo Bonzini wrote:
>> But I'm also starting to wonder whether it would be simpler to use
>> existing replication code. DRBD is more feature-rich, and you can use it
>> over loopback or NBD devices (respectively raw and non
2012/2/8 Dor Laor :
> On 02/08/2012 08:10 AM, Ori Mamluk wrote:
>>
>> 2. drbd is 'below' all the Qemu block layers - if the protected volume
>> is qcow2 then drbd doesn't get the raw IOs, right?
>
>
> That's one of the major caveats in drbd/iscsi/nbd - there is no support for
> block level snapshot
On Tue, 07 Feb 2012 14:34:12 +0100
Kevin Wolf wrote:
> The other message types could possibly be implemented as QMP commands. I
> guess we might need to attach multiple QMP monitors for this to work
> (one for libvirt, one for the rephub). I'm not sure if there is a
> fundamental problem with thi
On Wed, Feb 8, 2012 at 6:10 AM, Ori Mamluk wrote:
> 2. drbd is 'below' all the Qemu block layers - if the protected volume is
> qcow2 then drbd doesn't get the raw IOs, right?
No, if you look at the layers again:
Guest -> QEMU -> drbd -> local NBD server
The local NBD server runs the qcow2, qed
Am 08.02.2012 10:47, schrieb Ori Mamluk:
> On 08/02/2012 10:55, Kevin Wolf wrote:
>> Am 08.02.2012 07:10, schrieb Ori Mamluk:
>>> On 07/02/2012 17:47, Paolo Bonzini wrote:
Why can't QEMU itself stream the full volume in the background, and
send that together with any new I/O? Is it
On 08/02/2012 10:55, Kevin Wolf wrote:
Am 08.02.2012 07:10, schrieb Ori Mamluk:
On 07/02/2012 17:47, Paolo Bonzini wrote:
Why can't QEMU itself stream the full volume in the background, and
send that together with any new I/O? Is it because the rephub knows
which parts are out-of-date and nee
Am 08.02.2012 07:10, schrieb Ori Mamluk:
> On 07/02/2012 17:47, Paolo Bonzini wrote:
>> On 02/07/2012 03:48 PM, Ori Mamluk wrote:
The current streaming code in QEMU only deals with the former.
Streaming to a remote server would not be supported.
>>> I need it at the same time. The Re
On 02/08/2012 08:10 AM, Ori Mamluk wrote:
On 07/02/2012 17:47, Paolo Bonzini wrote:
On 02/07/2012 03:48 PM, Ori Mamluk wrote:
The current streaming code in QEMU only deals with the former.
Streaming to a remote server would not be supported.
I need it at the same time. The Rephub reads either
On 07/02/2012 17:47, Paolo Bonzini wrote:
On 02/07/2012 03:48 PM, Ori Mamluk wrote:
The current streaming code in QEMU only deals with the former.
Streaming to a remote server would not be supported.
I need it at the same time. The Rephub reads either the full volume or
parts of, and concurren
On 02/07/2012 02:12 PM, Anthony Liguori wrote:
Hi,
On 02/07/2012 04:29 AM, Ori Mamluk wrote:
Repagent is a new module that allows an external replication system to
replicate a volume of a Qemu VM.
This RFC patch adds the repagent client module to Qemu.
Please read http://wiki.qemu.org/Contri
On 02/07/2012 09:20 AM, Stefan Hajnoczi wrote:
On Tue, Feb 7, 2012 at 2:59 PM, Anthony Liguori wrote:
On 02/07/2012 07:50 AM, Stefan Hajnoczi wrote:
On Tue, Feb 7, 2012 at 1:34 PM, Kevin Wolfwrote:
Am 07.02.2012 11:29, schrieb Ori Mamluk:
Repagent is a new module that allows an extern
On 02/07/2012 03:48 PM, Ori Mamluk wrote:
The current streaming code in QEMU only deals with the former.
Streaming to a remote server would not be supported.
I need it at the same time. The Rephub reads either the full volume or
parts of, and concurrently protects new IOs.
Why can't QEMU itse
Am 07.02.2012 15:40, schrieb Paolo Bonzini:
> On 02/07/2012 03:06 PM, Ori Mamluk wrote:
>> The main issue about it is that the Rephub also needs the other
>> direction - to read the protected volume. I get the feeling that with
>> live block copy and NBD there's probably something that might fit
>>
On Tue, Feb 7, 2012 at 2:59 PM, Anthony Liguori wrote:
> On 02/07/2012 07:50 AM, Stefan Hajnoczi wrote:
>>
>> On Tue, Feb 7, 2012 at 1:34 PM, Kevin Wolf wrote:
>>>
>>> Am 07.02.2012 11:29, schrieb Ori Mamluk:
Repagent is a new module that allows an external replication system to
re
On 02/07/2012 08:40 AM, Paolo Bonzini wrote:
On 02/07/2012 03:06 PM, Ori Mamluk wrote:
The main issue about it is that the Rephub also needs the other
direction - to read the protected volume. I get the feeling that with
live block copy and NBD there's probably something that might fit
this need
On 02/07/2012 07:50 AM, Stefan Hajnoczi wrote:
On Tue, Feb 7, 2012 at 1:34 PM, Kevin Wolf wrote:
Am 07.02.2012 11:29, schrieb Ori Mamluk:
Repagent is a new module that allows an external replication system to
replicate a volume of a Qemu VM.
I recently joked with Kevin that QEMU is on its wa
On 07/02/2012 16:40, Paolo Bonzini wrote:
On 02/07/2012 03:06 PM, Ori Mamluk wrote:
The main issue about it is that the Rephub also needs the other
direction - to read the protected volume. I get the feeling that with
live block copy and NBD there's probably something that might fit
this need, n
On 07/02/2012 15:34, Kevin Wolf wrote:
Am 07.02.2012 11:29, schrieb Ori Mamluk:
Repagent is a new module that allows an external replication system to
replicate a volume of a Qemu VM.
This RFC patch adds the repagent client module to Qemu.
Documentation of the module role and API is in the p
On 02/07/2012 03:06 PM, Ori Mamluk wrote:
The main issue about it is that the Rephub also needs the other
direction - to read the protected volume. I get the feeling that with
live block copy and NBD there's probably something that might fit
this need, no?
Yes, with two NBD sockets you could do
On 07/02/2012 15:50, Stefan Hajnoczi wrote:
First let me say that I'm not completely used to the inline replies - so
I initially missed some of your mail before.
On Tue, Feb 7, 2012 at 1:34 PM, Kevin Wolf wrote:
Am 07.02.2012 11:29, schrieb Ori Mamluk:
Repagent is a new module that allows an
guori
Cc: Ori Mamluk; Kevin Wolf; qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC PATCH] replication agent module
On 02/07/2012 02:12 PM, Anthony Liguori wrote:
Hi,
On 02/07/2012 04:29 AM, Ori Mamluk wrote:
Repagent is a new module that allows an external replication system
to replicate a volume
On 02/07/2012 02:50 PM, Stefan Hajnoczi wrote:
I guess we might need to attach multiple QMP monitors for this to work
(one for libvirt, one for the rephub). I'm not sure if there is a
fundamental problem with this or if it just needs to be done.
Agreed. You can already query block devices usin
On 02/07/2012 02:50 PM, Stefan Hajnoczi wrote:
We still haven't figured out a nice way to
make image files full-fledged Linux block devices, so we're
reimplementing all the block code in QEMU userspace.
What about my favorite hammer, NBD?
Paolo
On Tue, Feb 7, 2012 at 1:34 PM, Kevin Wolf wrote:
> Am 07.02.2012 11:29, schrieb Ori Mamluk:
>> Repagent is a new module that allows an external replication system to
>> replicate a volume of a Qemu VM.
I recently joked with Kevin that QEMU is on its way to reimplementing
the Linux block and devi
Am 07.02.2012 11:29, schrieb Ori Mamluk:
> Repagent is a new module that allows an external replication system to
> replicate a volume of a Qemu VM.
>
> This RFC patch adds the repagent client module to Qemu.
>
>
>
> Documentation of the module role and API is in the patch at
> replication/qem
to:dl...@redhat.com]
Sent: Tuesday, February 07, 2012 2:25 PM
To: Anthony Liguori
Cc: Ori Mamluk; Kevin Wolf; qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC PATCH] replication agent module
On 02/07/2012 02:12 PM, Anthony Liguori wrote:
Hi,
On 02/07/2012 04:29 AM, Ori Mamluk wrote:
Repagent
nction I call from a new thread
context is bdrv_aio_readv.
-Original Message-
From: Dor Laor [mailto:dl...@redhat.com]
Sent: Tuesday, February 07, 2012 2:25 PM
To: Anthony Liguori
Cc: Ori Mamluk; Kevin Wolf; qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC PATCH] replication agent module
Hi,
On 02/07/2012 04:29 AM, Ori Mamluk wrote:
Repagent is a new module that allows an external replication system to
replicate a volume of a Qemu VM.
This RFC patch adds the repagent client module to Qemu.
Please read http://wiki.qemu.org/Contribute/SubmitAPatch
In particular, use a tool lik
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