VFS_SYNCOPS(8) System Administration tools VFS_SYNCOPS(8)NAME
vfs_syncops - Ensure meta data operations are performed synchronously.
SYNOPSIS
vfs objects = syncops
DESCRIPTION
This VFS module is part of the samba(7) suite.
Some filesystems (even some journaled filesystems) require that a fsync() be performed on many meta data operations to ensure that the
operation is guaranteed to remain in the filesystem after a power failure. This is particularly important for some cluster filesystems
which are participating in a node failover system with clustered Samba. On those filesystems the vfs_syncops VFS module provides a way to
perform those operations safely.
This module is stackable.
CONFIGURATION
Most of the performance loss with the vfs_syncops VFS module is in fsync on close(). You can disable that with syncops:onclose = no that
can be set either globally or per share.
On certain filesystems that only require the last data written to be fsync()'ed, you can disable the metadata synchronization of this
module with syncops:onmeta = no. This option can be set either globally or per share.
The vfs_syncops VFS module can also be disabled completely for a share with syncops:disable = true.
EXAMPLES
Add syncops functionality for [share]:
[share]
path = /data/share
vfs objects = syncops
syncops:onclose = no
VERSION
This man page is correct for version 4.1.0 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 4.1 06/17/2014 VFS_SYNCOPS(8)
Check Out this Related 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)
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