VFS_AIO_FORK(1M) System Administration tools VFS_AIO_FORK(1M)NAMEvfs_aio_fork - implement async I/O in Samba vfs
SYNOPSIS
vfs objects = aio_fork
DESCRIPTION
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.
EXAMPLES
Straight forward use:
[cooldata]
path = /data/ice
vfs objects = aio_fork
VERSION
This man page is correct for version 3.6.0 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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────────────────────┤
│Availability │ SUNWsmbar, SUNWsmbac, SUNWsmbau │
├────────────────────┼─────────────────────────────────┤
│Interface Stability │ External │
└────────────────────┴─────────────────────────────────┘
NOTES
Source code for Samba is available in the SUNWsmbaS package.
Samba(7) delivers the set of four SMF(5) services as can be seen from
the following example:
$ svcs samba wins winbind swat
STATE STIME FMRI
disabled Apr_21 svc:/network/samba:default
disabled Apr_21 svc:/network/winbind:default
disabled Apr_21 svc:/network/wins:default
disabled Apr_21 svc:/network/swat:default
where the services are:
"samba"
runs the smbd daemon managing the CIFS sessions
"wins"
runs the nmbd daemon enabling the browsing (WINS)
"winbind"
runs the winbindd daemon making the domain idmap
"swat"
Samba Web Administration Tool is a service providing access to
browser-based Samba administration interface and on-line
documentation. The service runs on software loopback network
interface on port 901/tcp, i.e. opening "http://localhost:901/" in
browser will access the SWAT service on local machine.
Please note: SWAT uses HTTP Basic Authentication scheme where user name
and passwords are sent over the network in clear text. In the SWAT case
the user name is root. Transferring such sensitive data is advisable
only on the software loopback network interface or over secure
networks.
Samba 3.6 04/10/2012 VFS_AIO_FORK(1M)
