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From: Paolo Bonzini <pbonzini@redhat.com>
To: Ori Mamluk <omamluk@zerto.com>
Cc: "Kevin Wolf" <kwolf@redhat.com>, "עודד קדם" <oded@zerto.com>,
	"תומר בן אור" <tomer@zertodata.com>,
	dlaor@redhat.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC PATCH] replication agent module
Date: Tue, 07 Feb 2012 16:47:36 +0100	[thread overview]
Message-ID: <4F314798.8010009@redhat.com> (raw)
In-Reply-To: <4F3139CE.4040103@zerto.com>

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 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parts are out-of-date and need recovery?  In that case, as a first 
approximation the rephub can pass the sector at which streaming should 
start.

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-raw), and also 
store the replication metadata on a file using the loopback device. 
Ceph even has a userspace library and support within QEMU.

Paolo

  reply	other threads:[~2012-02-07 15:47 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-07 10:29 [Qemu-devel] [RFC PATCH] replication agent module Ori Mamluk
2012-02-07 12:12 ` Anthony Liguori
2012-02-07 12:25   ` Dor Laor
2012-02-07 12:30     ` Ori Mamluk
2012-02-07 12:40       ` Anthony Liguori
2012-02-07 14:06         ` Ori Mamluk
2012-02-07 14:40           ` Paolo Bonzini
2012-02-07 14:48             ` Ori Mamluk
2012-02-07 15:47               ` Paolo Bonzini [this message]
2012-02-08  6:10                 ` Ori Mamluk
2012-02-08  8:49                   ` Dor Laor
2012-02-08 11:59                     ` Stefan Hajnoczi
2012-02-08  8:55                   ` Kevin Wolf
2012-02-08  9:47                     ` Ori Mamluk
2012-02-08 10:04                       ` Kevin Wolf
2012-02-08 13:28                         ` [Qemu-devel] [RFC] Replication agent design (was [RFC PATCH] replication agent module) Ori Mamluk
2012-02-08 14:59                           ` Stefan Hajnoczi
2012-02-08 14:59                             ` Stefan Hajnoczi
2012-02-19 13:40                             ` Ori Mamluk
2012-02-20 14:32                               ` Paolo Bonzini
2012-02-21  9:03                                 ` [Qemu-devel] BlockDriverState stack and BlockListeners (was: [RFC] Replication agent design) Kevin Wolf
2012-02-21  9:15                                   ` [Qemu-devel] BlockDriverState stack and BlockListeners Paolo Bonzini
2012-02-21  9:49                                     ` Kevin Wolf
2012-02-21 10:09                                       ` Paolo Bonzini
2012-02-21 10:51                                         ` Kevin Wolf
2012-02-21 11:36                                           ` Paolo Bonzini
2012-02-21 12:22                                             ` Stefan Hajnoczi
2012-02-21 12:57                                               ` Paolo Bonzini
2012-02-21 15:49                                               ` Markus Armbruster
2012-02-21 13:10                                             ` Kevin Wolf
2012-02-21 13:21                                               ` Paolo Bonzini
2012-02-21 15:56                                               ` Markus Armbruster
2012-02-21 16:04                                                 ` Kevin Wolf
2012-02-21 16:19                                                   ` Markus Armbruster
2012-02-21 16:39                                                     ` Kevin Wolf
2012-02-21 17:16                                               ` Stefan Hajnoczi
2012-02-21 10:20                                       ` Ori Mamluk
2012-02-29  8:38                                   ` Ori Mamluk
2012-03-03 11:46                                     ` Stefan Hajnoczi
2012-03-04  5:14                                       ` Ori Mamluk
2012-03-04  8:56                                         ` Paolo Bonzini
2012-03-05 12:04                                         ` Stefan Hajnoczi
2012-02-08 11:02                   ` [Qemu-devel] [RFC PATCH] replication agent module Stefan Hajnoczi
2012-02-08 13:00                     ` [Qemu-devel] [RFC] Replication agent requirements (was [RFC PATCH] replication agent module) Ori Mamluk
2012-02-08 13:30                       ` Anthony Liguori
2012-02-08 12:03                   ` [Qemu-devel] [RFC PATCH] replication agent module Stefan Hajnoczi
2012-02-08 12:46                     ` Paolo Bonzini
2012-02-08 14:39                       ` Stefan Hajnoczi
2012-02-08 14:55                         ` Paolo Bonzini
2012-02-08 15:07                           ` Stefan Hajnoczi
2012-02-07 14:53             ` Kevin Wolf
2012-02-07 15:00             ` Anthony Liguori
2012-02-07 13:34 ` Kevin Wolf
2012-02-07 13:50   ` Stefan Hajnoczi
2012-02-07 13:58     ` Paolo Bonzini
2012-02-07 14:05     ` Paolo Bonzini
2012-02-08 12:17       ` Orit Wasserman
2012-02-07 14:18     ` Ori Mamluk
2012-02-07 14:59     ` Anthony Liguori
2012-02-07 15:20       ` Stefan Hajnoczi
2012-02-07 16:25         ` Anthony Liguori
2012-02-21 16:01       ` Markus Armbruster
2012-02-21 17:31         ` Stefan Hajnoczi
2012-02-07 14:45   ` Ori Mamluk
2012-02-08 12:29     ` Orit Wasserman
2012-02-08 11:45   ` Luiz Capitulino

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