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Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's descrip
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description |
Date: |
Thu, 23 Apr 2015 14:11:32 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
On 23/04/2015 14:05, Dr. David Alan Gilbert wrote:
> As presented at the moment, I don't see there's any dynamic reconfiguration
> on the primary side at the moment
So that means the bdrv_start_replication and bdrv_stop_replication
callbacks are more or less redundant, at least on the primary?
In fact, who calls them? Certainly nothing in this patch set...
:)
Paolo
- it starts up in the configuration with
> the quorum(disk, NBD), and that's the way it stays throughout the
> fault-tolerant
> setup; the primary doesn't start running until the secondary is connected.
>
> Similarly the secondary startups in the configuration and stays that way;
> the interesting question to me is what happens after a failure.
>
> If the secondary fails, then your primary is still quorum(disk, NBD) but
> the NBD side is dead - so I don't think you need to do anything there
> immediately.
>
> If the primary fails, and the secondary takes over, then a lot of the
> stuff on the secondary now becomes redundent; does that stay the same
> and just operate in some form of passthrough - or does it need to
> change configuration?
>
> The hard part to me is how to bring it back into fault-tolerance now;
> after a primary failure, the secondary now needs to morph into something
> like a primary, and somehow you need to bring up a new secondary
> and get that new secondary an image of the primaries current disk.
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, (continued)
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Kevin Wolf, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Kevin Wolf, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Kevin Wolf, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Dr. David Alan Gilbert, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description,
Paolo Bonzini <=
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Dr. David Alan Gilbert, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Fam Zheng, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/23
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/24
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/24
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Dr. David Alan Gilbert, 2015/04/24
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/24
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Wen Congyang, 2015/04/24
- Re: [Qemu-block] [PATCH COLO v3 01/14] docs: block replication's description, Paolo Bonzini, 2015/04/24