| 1 | '\" t
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| 2 | .\" Title: vfs_syncops
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| 3 | .\" Author: [see the "AUTHOR" section]
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| 4 | .\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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| 5 | .\" Date: 10/25/2016
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| 6 | .\" Manual: System Administration tools
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| 7 | .\" Source: Samba 4.4
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| 8 | .\" Language: English
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| 9 | .\"
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| 10 | .TH "VFS_SYNCOPS" "8" "10/25/2016" "Samba 4\&.4" "System Administration tools"
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| 11 | .\" -----------------------------------------------------------------
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| 12 | .\" * Define some portability stuff
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| 13 | .\" -----------------------------------------------------------------
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| 14 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 15 | .\" http://bugs.debian.org/507673
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| 16 | .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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| 21 | .\" * set default formatting
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| 26 | .ad l
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| 27 | .\" -----------------------------------------------------------------
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| 28 | .\" * MAIN CONTENT STARTS HERE *
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| 29 | .\" -----------------------------------------------------------------
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| 30 | .SH "NAME"
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| 31 | vfs_syncops \- Ensure meta data operations are performed synchronously\&.
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| 32 | .SH "SYNOPSIS"
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| 33 | .HP \w'\ 'u
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| 34 | vfs objects = syncops
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| 35 | .SH "DESCRIPTION"
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| 36 | .PP
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| 37 | This VFS module is part of the
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| 38 | \fBsamba\fR(7)
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| 39 | suite\&.
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| 40 | .PP
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| 41 | 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
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| 42 | vfs_syncops
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| 43 | VFS module provides a way to perform those operations safely\&.
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| 44 | .PP
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| 45 | This module is stackable\&.
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| 46 | .SH "CONFIGURATION"
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| 47 | .PP
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| 48 | Most of the performance loss with the
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| 49 | vfs_syncops
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| 50 | VFS module is in fsync on close()\&. You can disable that with
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| 51 | syncops:onclose = no
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| 52 | that can be set either globally or per share\&.
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| 53 | .PP
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| 54 | On certain filesystems that only require the last data written to be fsync()\*(Aqed, you can disable the metadata synchronization of this module with
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| 55 | syncops:onmeta = no\&. This option can be set either globally or per share\&.
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| 56 | .PP
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| 57 | The
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| 58 | vfs_syncops
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| 59 | VFS module can also be disabled completely for a share with
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| 60 | syncops:disable = true\&.
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| 61 | .SH "EXAMPLES"
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| 62 | .PP
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| 63 | Add syncops functionality for [share]:
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| 64 | .sp
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| 65 | .if n \{\
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| 66 | .RS 4
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| 67 | .\}
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| 68 | .nf
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| 69 | \fI[share]\fR
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| 70 | \m[blue]\fBpath = /data/share\fR\m[]
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| 71 | \m[blue]\fBvfs objects = syncops\fR\m[]
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| 72 | \m[blue]\fBsyncops:onclose = no\fR\m[]
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| 73 | .fi
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| 74 | .if n \{\
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| 75 | .RE
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| 76 | .\}
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| 77 | .SH "VERSION"
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| 78 | .PP
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| 79 | This man page is correct for version 4\&.1\&.0 of the Samba suite\&.
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| 80 | .SH "AUTHOR"
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| 81 | .PP
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| 82 | 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\&.
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