mm 953bf4fcbd Disable vdev cache (readahead) by default.
The vdev cache is very underutilized (hit ratio 30%-70%) and may consume
excessive memory on systems with many vdevs.

Illumos-gate revision:	13346

Obtained from:	Illumos (Bug #175)
MFC after:	1 week
2011-06-28 06:32:35 +00:00
..
MFC
2011-05-16 16:34:03 +00:00