Can PBS act as SAN as well?

I have been tasked with building a production Proxmox system where the intention was to have two PVE servers in a cluster, plus one PBS system to provide storage and backup services (and to be a QDevice). When it was designed, the PBS is the sole storage system and therefore has all the large SSDs (five 7.68TB SSDs), and the two VM servers contain just a basic 400GB SSD each to house the PVE host OS.

The assumption was that PBS would be a large storage pool that would be used for both the...

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