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man pages section 8: System Administration Commands

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Updated: Wednesday, July 27, 2022

vfs_aio_fork (8)


vfs_aio_fork - implement async I/O in Samba vfs


vfs objects = aio_fork


System Administration tools                                    VFS_AIO_FORK(8)

       vfs_aio_fork - implement async I/O in Samba vfs

       vfs objects = aio_fork

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

       The aio_fork VFS module enables async I/O for Samba on platforms where
       the system level Posix AIO interface is insufficient. 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.

       To work around all these limitations, the aio_fork module was written.
       It uses forked helper processes instead of the internal Posix AIO
       interface to create asynchronousity for read and write calls. It has no
       parameters, it will create helper processes when async requests come in
       as needed. Idle helper processes will be removed every 30 seconds.

       This module is stackable.

       Straight forward use:

                path = /data/ice
                vfs objects = aio_fork

       This man page is part of version 4.13.17 of the Samba suite.

       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.

       See attributes(7) for descriptions of the following attributes:

       |Availability   | service/network/samba |
       |Stability      | Volatile              |

       Source code for open source software components in Oracle Solaris can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-

       This software was built from source available at
       https://github.com/oracle/solaris-userland.  The original community
       source was downloaded from

       Further information about this software can be found on the open source
       community website at http://www.samba.org/.

Samba 4.13.17                     06/28/2022                   VFS_AIO_FORK(8)