Egregoros

@mwl for me, on 15.0-R, both nvme and virtio present 512-byte sectors to the VM by default. (i haven't tested ahci.)

i usually change that to 4k anyway, but i'm not sure if that makes any real-world performance difference. i'm using regular (zfs) files though, not zvols, i wonder if that makes a difference.

@lw @mwl did the "zvol performance is garbage compared to files" problem ever get solved?

@feld i haven't seen any updates since the Klara article about that, but i also don't really follow ZFS development. mostly i find files are just easier -- the same reason i don't use raw devices for my databases, even though that's usually faster. so i'd probably stick with files anyway for my own uses, which aren't performance-critical. @mwl

@crest @mwl @lw how about pictures?

4K writes are 600% faster on file backed, 1MB writes are over 200% faster

zvol had this issue even on Solaris IIRC