Hi list,
When reading the documentation for the new way of mirroring [1], some
questions arose, especially with the following sentence:
> Since this mode is not point-in-time consistent, the full snapshot
delta will need to be synced prior to use during a failover scenario.
1) I'm not sure I follow. Why are snapshots not point-in-time, whereas
using the journal-based mirroring is?
2) Also, I am not sure what the implications are for the second part of
the referenced sentence, what significance does the word "full" bear in
"full snapshot delta" ? Further, Isn't it obvious that in order to do a
failover, the other side should have the latest snapshot? - I am
probably missing what the documentation is trying to tell me.
All in all, I think some background concepts are missing in order to
read this chapter of the documentation. It might well be that this is
explained somewhere else in the docs, but maybe we should link to that.
If someone can explain the above 2 points, I'm willing to take a shot at
making a patch if I can make this clearer in the docs.
Thanks,
Hans
[1] https://docs.ceph.com/docs/octopus/rbd/rbd-mirroring/
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