vfs_time_audit(8) [centos man page]

VFS_TIME_AUDIT(8)					    System Administration tools 					 VFS_TIME_AUDIT(8)

NAME

       vfs_time_audit - samba vfs module to log slow VFS operations

SYNOPSIS

       vfs objects = time_audit

DESCRIPTION

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

       The time_audit VFS module logs system calls that take longer than the number of milliseconds defined by the variable time_audit:timeout. It
       will log the calls and the time spent in it.

       It's kind of comparable with strace -T and is helpful to reveal performance problems with the underlying file and storage subsystems.

       This module is stackable.

OPTIONS

       time_audit:timeout = number of milliseconds
	   VFS calls that take longer than the defined number of milliseconds that should be logged. The default is 10000 (10s).

EXAMPLES

       This would log VFS calls that take longer than 3 seconds:

		   [sample_share]
		path = /test/sample_share
		vfs objects = time_audit
		time_audit:timeout = 3000

VERSION

       This man page is correct for version 4.0.0 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.

       The time_audit VFS module was created with contributions from Abhidnya Chirmule.

Samba 4.0							    06/17/2014							 VFS_TIME_AUDIT(8)

VFS_AIO_FORK(8) 					    System Administration tools 					   VFS_AIO_FORK(8)

NAME

       vfs_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 4.0.0 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_FORK(8)