[Samba] Samba 4 DC and member server, rfc3207, winbind, printing, asynchronous I/O - Problems and Fixes

[Jeremy Allison]

On Tue, Nov 19, 2013 at 02:53:11PM +0800, Kinglok, Fong wrote:
> 
> 4.  Asynchronous I/O - should update how-to:
> Reading “The Evolution of I/O in samba” by Mr. Jeremy Allison has been enjoyable.  As an system administrator, I am tempted to enable aio in my samba system.  When trying to do this, I found out less information can be found how to enable aio in samba 4.  Initially, I would love to enable vfs_aio_linux.  However, I cannot turn on the module and found out that the relevant .so is not built even I have tried "apt-get install libaio-dev" in my debian box.  I have no way but turn to enable vfs_aio_pthread instead by the following smb.conf in the member server:
> 
> [global]
>    vfs objects = acl_xattr, aio_pthread
>    aio read size = 1024
>    aio write size = 1024
> 
> The reading performance increases 30% in my test.  I think it is worthwhile to amend it to the official how-to!  And please tell how to build vfs_aio_linux in samba 4 in debian.

Thanks for that info ! Turning on vfs_aio_linux is not
suggested, as it doesn't really help performance (for various
reasons). Consider it a failed experiment.

aio_pthread should be considered the (working) replacement.

Cheers,

	Jeremy.