[magicalhippo]

> But what ensures zraid block coverage on more than one spindle? This probably is safe for a large enough set of drives, but what is the threshold?

Surely they'll use a similar allocation strategy to what ZFS currently uses to allocate disk sectors. And of course if you mix a 4TB and a 8TB drive in a AnyRaid-Mirror configuration, you can only ever have 4TB redundant, so like current ZFS I assume you'll see 4TB. But if you then add a 12TB drive later, you can get 12TB mirrored.

> Is it going to be accepted upstream?

Good question. The S3 storage backend was initially said to be upstreamed, but ended up staying private to maintain a competitive edge.

Haven't checked out HexOS before, but given they're partnering with TrueNAS[1] and hiring Klara, Inc for development, one can certainly hope so.

[1]: https://www.truenas.com/blog/powered-by-truenas-hexos/

[ggm]

Say you have a 2, 2x4s and an 8. You should be able to have almost everything mirrored or have some raidz2 and some raidz1.

[magicalhippo]

You could mirror them, then you could use all the space.

Not sure I see how you'd do a raidz2+raidz1 combo using those drives, at least not without losing 4TB of the 8TB drive, but then I'm tired so.