diff options
| -rw-r--r-- | docs-xml/smbdotconf/tuning/strictallocate.xml | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/docs-xml/smbdotconf/tuning/strictallocate.xml b/docs-xml/smbdotconf/tuning/strictallocate.xml index 2606f2028b..88ebfb0948 100644 --- a/docs-xml/smbdotconf/tuning/strictallocate.xml +++ b/docs-xml/smbdotconf/tuning/strictallocate.xml @@ -10,14 +10,26 @@ of actually forcing the disk system to allocate real storage blocks when a file is created or extended to be a given size. In UNIX terminology this means that Samba will stop creating sparse files. - This can be slow on some systems.</para> + This can be slow on some systems. When you work with large files like + >100MB or so you may even run into problems with clients running into + timeouts.</para> - <para>When strict allocate is <constant>no</constant> the server does sparse - disk block allocation when a file is extended.</para> + <para>When you have an extent based filesystem it's likely that we can make + use of unwritten extents which allows Samba to allocate even large ammounts + of space very fast and you will not see any timeout problems caused by + strict allocate. With strict allocate in use you will also get much better + out of quota messages in case you use quotas. Another advantage of + activating this setting is that it will help to reduce file + fragmentation.</para> + + <para>To give you an idea on which filesystems this setting might currently + be a good option for you: XFS, ext4, btrfs, ocfs2 on Linux and JFS2 on + AIX support unwritten extents. On Filesystems that do not support it, + preallocation is probably an expensive operation where you will see reduced + performance and risk to let clients run into timeouts when creating large + files. Examples are ext3, ZFS, HFS+ and most others, so be aware if you + activate this setting on those filesystems.</para> - <para>Setting this to <constant>yes</constant> can help Samba return - out of quota messages on systems that are restricting the disk quota - of users.</para> </description> <value type="default">no</value> |