Security modules in Samba

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vfs_aio_pthread

VFS_AIO_PTHREAD(8)					    System Administration tools 					VFS_AIO_PTHREAD(8)

NAME

       vfs_aio_pthread - implement async I/O in Samba vfs using a pthread pool

SYNOPSIS

       vfs objects = aio_pthread

DESCRIPTION

       This VFS module is part of the samba(7) suite.

       The aio_pthread VFS module enables asynchronous I/O for Samba on platforms which have the pthreads API available, without using the Posix
       AIO interface. Posix AIO can suffer from severe limitations. For example, on some Linux versions the real-time signals that it uses are
       broken under heavy load. Other systems only allow AIO when special kernel modules are loaded or only allow a certain system-wide amount of
       async requests being scheduled. Systems based on glibc (most Linux systems) only allow a single outstanding request per file descriptor
       which essentially makes Posix AIO useless on systems using the glibc implementation.

       To work around all these limitations, the aio_pthread module was written. It uses a pthread pool instead of the internal Posix AIO
       interface to allow read and write calls to be process asynchronously. A pthread pool is created which expands dynamically by creating new
       threads as work is given to it to a maximum of 100 threads per smbd process. To change this limit see the "aio num threads" parameter
       below. New threads are not created if idle threads are available when a new read or write request is received, the new work is given to an
       existing idle thread. Threads terminate themselves if idle for one second.

       Note that the smb.conf parameters aio read size and aio write size must also be set appropriately for this module to be active.

       This module MUST be listed last in any module stack as the Samba VFS pread/pwrite interface is not thread-safe. This module makes direct
       pread and pwrite system calls and does NOT call the Samba VFS pread and pwrite interfaces.

EXAMPLES

       Straight forward use:

		   [cooldata]
		path = /data/ice
		aio read size = 1024
		aio write size = 1024
		vfs objects = aio_pthread

OPTIONS

       aio_pthread:aio num threads = INTEGER
	   Limit the maximum number of threads per smbd that will be created in the thread pool to service IO requests.

	   By default this is set to 100.

VERSION

       This man page is correct for version 4.0 of the Samba suite.

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
       Source project similar to the way the Linux kernel is developed.

Samba 4.0							    06/17/2014							VFS_AIO_PTHREAD(8)

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