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Re: [Qemu-devel] [RFC PATCH] replication agent module
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [RFC PATCH] replication agent module |
Date: |
Wed, 08 Feb 2012 09:55:17 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0 |
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 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 which parts are out-of-date and need recovery?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.
> Yes - it's because rephub knows. The parts that need recovery may be a
> series of random IOs that were lost because of a network outage
> somewhere along the replication pipe.
> Easy to think of it as a bitmap holding the not-yet-replicated IOs. The
> rephub occasionally reads those areas to 'sync' them, so in effect the
> rephub needs read access - it's not really to trigger streaming from an
> offset.
So how does the rephub know which areas were touched by lost requests?
Isn't qemu the only one who could know what it sent?
Kevin
- Re: [Qemu-devel] [RFC PATCH] replication agent module, (continued)
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Dor Laor, 2012/02/07
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Ori Mamluk, 2012/02/07
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Anthony Liguori, 2012/02/07
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Ori Mamluk, 2012/02/07
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Paolo Bonzini, 2012/02/07
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Ori Mamluk, 2012/02/07
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Paolo Bonzini, 2012/02/07
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Ori Mamluk, 2012/02/08
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Dor Laor, 2012/02/08
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Stefan Hajnoczi, 2012/02/08
- Re: [Qemu-devel] [RFC PATCH] replication agent module,
Kevin Wolf <=
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Ori Mamluk, 2012/02/08
- Re: [Qemu-devel] [RFC PATCH] replication agent module, Kevin Wolf, 2012/02/08
- Re: [Qemu-devel] [RFC] Replication agent design (was [RFC PATCH] replication agent module), Ori Mamluk, 2012/02/08
- Re: [Qemu-devel] [RFC] Replication agent design (was [RFC PATCH] replication agent module), Stefan Hajnoczi, 2012/02/08
- Re: [Qemu-devel] [RFC] Replication agent design (was [RFC PATCH] replication agent module), Stefan Hajnoczi, 2012/02/08
- Re: [Qemu-devel] [RFC] Replication agent design (was [RFC PATCH] replication agent module), Ori Mamluk, 2012/02/19
- Re: [Qemu-devel] [RFC] Replication agent design (was [RFC PATCH] replication agent module), Paolo Bonzini, 2012/02/20
- [Qemu-devel] BlockDriverState stack and BlockListeners (was: [RFC] Replication agent design), Kevin Wolf, 2012/02/21
- Re: [Qemu-devel] BlockDriverState stack and BlockListeners, Paolo Bonzini, 2012/02/21
- Re: [Qemu-devel] BlockDriverState stack and BlockListeners, Kevin Wolf, 2012/02/21