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From: Anthony Liguori <anthony@codemonkey.ws>
To: Ori Mamluk <omamluk@zerto.com>
Cc: "Kevin Wolf" <kwolf@redhat.com>,
	dlaor@redhat.com, "Stefan Hajnoczi" <stefanha@gmail.com>,
	"תומר בן אור" <tomer@zertodata.com>,
	qemu-devel@nongnu.org, "עודד קדם" <oded@zerto.com>,
	"Yair Kuszpet" <yairk@zerto.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [RFC] Replication agent requirements (was [RFC PATCH] replication agent module)
Date: Wed, 08 Feb 2012 07:30:31 -0600	[thread overview]
Message-ID: <4F3278F7.3000804@codemonkey.ws> (raw)
In-Reply-To: <4F3271E3.50704@zerto.com>

On 02/08/2012 07:00 AM, Ori Mamluk wrote:
> Hi,
> Following previous mails from Kevin and Dor, I'd like to specify the high level
> requirements of a replication agent as I see them.
>
> 1. Report each write to a protected volume to the rephub, at an IO transaction
> granularity
> * The reporting is not synchronous, i.e. the write completion is not delayed
> until the rephub received it.
> * The IOs have to be the raw guest IOs - i.e. not converted to any sparse format
> or another filter that alters the size/offset

For now.  I'm sure you'll eventually have a synchronous replication requirement.

We're doomed to reinvent all of the Linux storage layer it seems.  I think we 
really only have two choices: make better use of kernel facilities for this 
(like drbd) or have a proper, pluggable, storage interface so that QEMU proper 
doesn't have to deal with all of this.

Gluster is appealing as a pluggable storage interface although the license is 
problematic for us today.

I'm quite confident that we shouldn't be in the business of replicating storage 
though.  If the answer is NBD++, that's fine too.

Regards,

Anthony Liguori

  reply	other threads:[~2012-02-08 13:30 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
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 [this message]
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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