[Drbd-dev] The drbd resync process

[Drbd-dev] The drbd resync process

[niko]

Consider node A crashed as primary and rejoining the cluster,B as the
surviving node.
What's the resync process ?

I can't find how the drbd_start_resync () function call the
w_make_resync_request() to send RSDataRequest message to the SyncSource

When the peer node recovers or the connection is re-established, DRBD
combines the bitmap information from both nodes to determine the total
data set that it must re-synchronize.

Why DRBD needs to combines the bitmap information from both nodes since
one is Primary,the other is Secondary?

Thanks ,I'm just a learner.

Re: [Drbd-dev] The drbd resync process

[Lars Ellenberg]

On Fri, Aug 08, 2008 at 04:16:43PM +0800, niko wrote:
> Consider node A crashed as primary and rejoining the cluster,B as the
> surviving node.
> What's the resync process ?
> 
> I can't find how the drbd_start_resync () function call the
> w_make_resync_request() to send RSDataRequest message to the SyncSource

it is "queued for the worker",
and requeued via a timer.

> When the peer node recovers or the connection is re-established, DRBD
> combines the bitmap information from both nodes to determine the total
> data set that it must re-synchronize.
> 
> Why DRBD needs to combines the bitmap information from both nodes since
> one is Primary,the other is Secondary?

both nodes may have changed the data independently.

> Thanks ,I'm just a learner.

now, I'd like to learn a bit more about you, still. so let me repeat my
question,

What is your motivation for this?
How can you help us?
How can you help us help you?


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