[Drbd-dev] [PATCH] drbdadm: Fix handler called from kernel always invalid for stacking resource

[Nick Wang]

>>> On 2017-7-18 at 16:22, in message <20170718082217.GD4122 at soda.linbit>, Lars
Ellenberg <lars.ellenberg at linbit.com> wrote:
> On Tue, Jul 18, 2017 at 11:16:15AM +0800, Nick Wang wrote:
> >Handler like "before-resync-target" called from kernel
> >space does not have "-S" option for stacking resource, it
> >always return as invalid usage for stacking resource in
> >normal mode, then the connection will be dropped. Add "-S"
> >option for stacking resource automatically if the handler
> >is called from kernel.
> 
> I think the intention was to no longer have stacked with 9,
> stacked was a kludge anyways, because that was the only way
> to add additional nodes with a two-node only replication.
> 
Agree, it is more useful and effective in 8 stage:) Stack still can be 
used in some simple migration without changing any configuration,
for sure the meta data must be converted/replaced to 9 format.
But for two clusters (2 nodes per site) in long distance(cities), only 
need to replicate the same data once to the DR, which is more 
efficiency configure in a plain multiple nodes when the bandwidth 
hit the bottleneck.

And stack is worked with 9. It should not fail/drop connection due to 
an internal call for snapshot of resync target from kernel space.

> That we did not patch it out was probably just being lazy.

:)

Best regards,
Nick