Another option is to let PosgreSQL do the replication with local storage. There 
are great reasons for Ceph, but databases optimize for this kind of thing 
extremely well. 

With replication in hand, run snapshots to RADOS buckets for long term storage.

> On Oct 17, 2020, at 7:28 AM, Gencer W. Genç <gen...@gencgiyen.com> wrote:
> 
> Hi,
> 
> I have an existing few RBDs. I would like to create a new RBD Image for 
> PostgreSQL. Do you have any suggestions for such use cases? For example;
> 
> Currently defaults are:
> 
> Object size (4MB) and Stripe Unit (None)
> Features: Deep flatten + Layering + Exclusive Lock + Object Map + FastDiff
> 
> Should I use as is or should I use 16KB of object size and different sets of 
> features for PostgreSQL?
> 
> Thanks,
> Gencer.
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