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Martin Matuska b28e57cb82 Allow setting a lower ashift with -o ashift 
Previous patches have allowed you to set an increased ashift to
avoid doing 512b IO with 4k sector devices.  However, it was not
possible to set the ashift lower than the reported physical sector
size even when a smaller logical size was supported.  In practice,
there are several cases where settong a lower ashift is useful:

* Most modern drives now correctly report their physical sector
  size as 4k.  This causes zfs to correctly default to using a 4k
  sector size (ashift=12).  However, for some usage models this
  new default ashift value causes an unacceptable increase in
  space usage.  Filesystems with many small files may see the
  total available space reduced to 30-40% which is unacceptable.

* When replacing a drive in an existing pool which was created
  with ashift=9 a modern 4k sector drive cannot be used.  The
  'zpool replace' command will issue an error that the new drive
  has an 'incompatible sector alignment'.  However, by allowing
  the ashift to be manual specified as smaller, non-optimal,
  value the device may still be safely used.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1381
Closes #1328
Issue #967
Issue #548
2013-04-12 10:50:46 -07:00
cmd Refresh links to web site 2013-03-06 15:46:41 -08:00
config Replace the ZFS_AC_META perl dependency with awk 2013-04-02 16:05:45 -07:00
dracut Refresh dracut module setup 2013-03-21 12:51:06 -07:00
etc Remove ARCH packaging 2013-03-06 15:46:41 -08:00
include build: resolve orthographic and other grammatical errors 2013-04-02 10:44:52 -07:00
lib Illumos #3422, #3425 2013-04-12 09:01:36 -07:00
man Man page updates for SMB 2013-04-02 10:36:25 -07:00
module Allow setting a lower ashift with -o ashift 2013-04-12 10:50:46 -07:00
patches Adding grub2 mkconfig support patch 2012-07-30 16:17:23 -07:00
rpm Add additional dependencies for DKMS package 2013-04-02 16:06:02 -07:00
scripts build: resolve orthographic and other grammatical errors 2013-04-02 10:44:52 -07:00
udev Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
.gitignore gitignore: anchor entries at their respective directory 2013-04-02 10:50:17 -07:00
AUTHORS Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
autogen.sh build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
configure.ac Automake 1.10.1 compat: AM_SILENT_RULES 2013-04-02 16:05:45 -07:00
copy-builtin Consistent menuconfig name 2012-08-26 13:49:37 -07:00
COPYRIGHT Refresh links to web site 2013-03-06 15:46:41 -08:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
META Tag zfs-0.6.1 2013-03-26 08:50:29 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
zfs-script-config.sh.in Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

Native ZFS for Linux!

ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.

ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.

Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org