On Fri, Jul 02, 2010 at 03:14:54AM -0400, Lachlan McIlroy wrote:
| Hi all, it's been a while since I posted here!
|
| Various updates to chapters 1,2,4 and 5 of the XFS User Guide.
|
| Fixed various spelling/grammar mistakes, updated outdated and/or
| incorrect facts, added some new slides for delayed allocation and
| direct i/o and fixed some XML formatting for command line examples.
I asked our tech pubs editor for comments. Lori always has good editing
advice.
----- Forwarded message from Lachlan McIlroy <lmcilroy@xxxxxxxxxx> -----
+ Extended attributes (ie Access Control Lists)
^^
such as
+ Extent based allocation (incl. unwritten extents)
^^^^^
including
<listitem><para>Filesystem blocks are comprised of one or more device-level sectors.</para></listitem>
^^^^^^^^^
composed
+ <listitem><para>Through direct IOs of specific alignment (ie stripe boundaries)</para></listitem>
^^
such as
+ <listitem><para>free block count is decremented</para></listitem>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
decrements free block count
+ <listitem><para>Reduces fragmentation by combining writes and allocating extents in large chunks</para></listitem>
^^^^^^^^^^^^^^^^^^^^^
Fragmentation is reduced
+ <listitem><para>Files written randomly (ie memory mapped) can now be allocated contiguously</para></listitem>
^^
such as those that are
+ <listitem><para>Data does not pass through the file system cache</para></listitem>
^^^^^^^^^^^
filesystem
+ <listitem><para>Backup programs can work without polluting the page cache</para></listitem>
^^^
that can
or
, so that they can
??
+ <para>Direct I/O can align block allocations on strip unit/width boundaries</para>
^^^^^
stripe
?
+ <listitem><para>In memory XFS inode used only by the filesystem</para></listitem>
^^^^^^^^^
In-memory
+ <para>Log replay will apply filesystem and metadata changes during mount that had been
^^^^^
a mount
+ <para>mkfs.xfs supports a large number of options for configurating many different XFS filesystems</para>
^^^^^^^^^^^^^
configuring
+ <listitem><para>Allocator will rotor data extents across allocations groups to leave room for inodes</para></listitem>
^^^^
rotate ?
+ <listitem><para>Only available on 64 bit machines</para></listitem>
^^^^^^
64bit
(to be consistent with other uses here)
+ <para>If neither of these two options are specified, then filesystem will behave as if
^^^^^^^^^^
the filesystem
--
Geoffrey Wehrman
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