Sure, if all you need is block or object storage there are many alternatives. But if you need NAS which satisfies basic requirements (performant, NFS, HA, snaps

Sure, if all you need is block or object storage there are many alternatives. But if you need NAS which satisfies basic requirements (performant, NFS, HA, snapshots, writable snapshots) it's hard to find better than Netapp. All I've seen is poorly integrated NAS gateways on top of block storage. Perhaps Oracle ZFS is somewhat close.