Disclaimer: *I work for Nutanix*

Consider looking at Nutanix - you can get the hardware from HPE (including Apollo).

Object storage from Nutanix doesn’t even break a sweat at 10PB of usable storage.

However the main reasons to look at Nutanix would be ease of use for

day 0 (bootstrapping) day 1 (administration operations, capacity management), fault tolerance and day n operations (upgrades, security patches etc)

Nutanix spends considerable time and resources on all this to make life of our customers easy.