This feature is for performance, not the case you described.
Does it really matter in the modern world where a vanilla two-socket rack unit has a terabyte of DRAM? Everything at scale happens in RAM these days. Everything. Replicating across datacenters gets you all the reliability you need, with none of the fussing about storage latency and block device I/O strategy.
Considering that multiple ZFS developers get paid to make ZFS work well on petabyte-sized disk arrays with SSD caching, and one of them often reports on progress in this area in his podcasts (2.5admins.com and bsdnow if you're interested) .. then yes?
forza_user•2d ago
- https://github.com/kakra/linux/pull/36
- https://wiki.tnonline.net/w/Btrfs/Allocator_Hints
What do you think?
dontdoxxme•4h ago
It seems these patches possibly fix that.