zfsio.d seems to work well for zvols, but not for CIFS/NFS shares. Need to test more.

[kdavyd]

[kdavyd]

Local dd from /dev/urandom to a zfs filesystem catches no events either. This bit should be easiest to reproduce.

[kdavyd]

Issue not reproducible on small blocksize; reproducible on 1M blocksize. I think that when we get at or above 128k, a different code path is used.

root@myhost:/volumes/blah/nfs# dd if=/dev/urandom bs=127K of=./test.1m count=100
works

root@myhost:/volumes/blah/nfs# dd if=/dev/urandom bs=128K of=./test.1m count=100
doesn't work