3 ms·

ZNS does support random writes to the uncommitted blocks at the head of a zone.

• wtallis 6y ago
  I'm not sure what you're trying to say there. My understanding is that each zone is append-only, which definitely isn't how flash erase blocks work.
  • Veedrac 6y ago
    They're not quite append only, there's a ‘zone random write area’ that you can update in-place that exposes the write buffer in front of a zone. To a lesser degree, it also supports parallel appends, which naturally aren't purely sequential either. So you've got random writes both between zones and at the front of each zone. The one thing missing is being able to erase blocks within the committed portion of a zone, but idk how you'd support that without just reimplementing a block layer.
    • wtallis 6y ago
      The ZNS spec doesn't seem to have been published quite yet, but from what I can find it seems like the zone random write area is an optional extension that won't necessarily be implemented by all vendors.