[pve-devel] [RFC qemu/storage/qemu-server/container/manager 00/23] backup provider API

[Dietmar Maurer]

> Today, I believe the client is reading the data and pushing it to
> PBS. In the case of CEPH, wouldn't this involve sourcing data from
> multiple nodes and then sending it to PBS? Wouldn't it be more
> efficient for PBS to read it directly from storage? In the case of
> centralized storage, we'd like to eliminate the client load
> completely, having PBS ingest increment differences directly from
> storage without passing through the client.

But Ceph is not a central storage. Instead, data is distributed among the nodes, so you always need to send some data over the network.
There is no way to "read it directly from storage".