freebsd-nq/include
Brian Behlendorf 395350c85d Improve AF hard disk detection
Use the bdev_physical_block_size() interface to determine the
minimize write size which can be issued without incurring a
read-modify-write operation.  This is used to set the ashift
correctly to prevent a performance penalty when using AF hard
disks.

Unfortunately, this interface isn't entirely reliable because
it's not uncommon for disks to misreport this value.  For this
reason you may still need to manually set your ashift with:

  zpool create -o ashift=12 ...

The solution to this in the upstream Illumos source was to add
a while list of known offending drives.  Maintaining such a list
will be a burden, but it still may be worth doing if we can
detect a large number of these drives.  This should be considered
as future work.

Reported-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #916
2012-09-04 15:35:32 -07:00
..
linux Improve AF hard disk detection 2012-09-04 15:35:32 -07:00
sys Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
libnvpair.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
libuutil_common.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
libuutil_impl.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
libuutil.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
libzfs_impl.h Illumos #1644, #1645, #1646, #1647, #1708 2012-07-31 09:25:30 -07:00
libzfs.h Illumos #2635: 'zfs rename -f' to perform force unmount 2012-08-23 10:39:43 -07:00
Makefile.am Add the release component to headers 2012-01-18 12:19:47 -08:00
zfs_comutil.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
zfs_deleg.h Illumos #278: get rid zfs of python and pyzfs dependencies 2011-08-01 12:09:36 -07:00
zfs_fletcher.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
zfs_namecheck.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
zfs_prop.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
zpios-ctl.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
zpios-internal.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00