Not familiar with that option, but having a quick look in src
it doesn't seem to be FS specific, seems to be handled by vfs.

Can anyone confirm or deny this?

----- Original Message ----- From: "Slawa Olhovchenkov" <[email protected]>


On Wed, Oct 23, 2013 at 09:54:59AM +0000, Steven Hartland wrote:

Author: smh
Date: Wed Oct 23 09:54:58 2013
New Revision: 256956
URL: http://svnweb.freebsd.org/changeset/base/256956

Log:
  Improve ZFS N-way mirror read performance by using load and locality
  information.

What about support F_READAHEAD in ZFS (with prefetch disabled by
CPU-intensive)?


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