| 1 | '\" t
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| 2 | .\" Title: vfs_commit
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| 3 | .\" Author: [see the "AUTHOR" section]
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| 4 | .\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
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| 5 | .\" Date: 09/18/2013
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| 6 | .\" Manual: System Administration tools
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| 7 | .\" Source: Samba 3.6
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| 8 | .\" Language: English
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| 9 | .\"
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| 10 | .TH "VFS_COMMIT" "8" "09/18/2013" "Samba 3\&.6" "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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| 17 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 18 | .ie \n(.g .ds Aq \(aq
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| 19 | .el .ds Aq '
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| 20 | .\" -----------------------------------------------------------------
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| 21 | .\" * set default formatting
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| 22 | .\" -----------------------------------------------------------------
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| 23 | .\" disable hyphenation
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| 24 | .nh
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| 25 | .\" disable justification (adjust text to left margin only)
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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_commit \- flush dirty data at specified intervals
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| 32 | .SH "SYNOPSIS"
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| 33 | .HP \w'\ 'u
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| 34 | vfs objects = commit
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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 | The
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| 42 | vfs_commit
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| 43 | VFS module keeps track of the amount of data written to a file and synchronizes it to disk when a specified amount accumulates\&.
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| 44 | .PP
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| 45 | vfs_commit
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| 46 | is useful in two circumstances\&. First, if you have very precious data, the impact of unexpected power loss can be minimized by a small commit:dthresh value\&. Secondly, write performance can be improved on some systems by flushing file data early and at regular intervals\&.
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| 47 | .PP
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| 48 | This module is stackable\&.
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| 49 | .SH "OPTIONS"
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| 50 | .PP
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| 51 | commit:dthresh = BYTES
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| 52 | .RS 4
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| 53 | Synchronize file data each time the specified number of bytes has been written\&.
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| 54 | .sp
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| 55 | The following suffixes may be applied to BYTES:
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| 56 | .sp
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| 57 | .RS 4
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| 58 | .ie n \{\
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| 59 | \h'-04'\(bu\h'+03'\c
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| 60 | .\}
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| 61 | .el \{\
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| 62 | .sp -1
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| 63 | .IP \(bu 2.3
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| 64 | .\}
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| 65 | K
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| 66 | \- BYTES is a number of kilobytes
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| 67 | .RE
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| 68 | .sp
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| 69 | .RS 4
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| 70 | .ie n \{\
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| 71 | \h'-04'\(bu\h'+03'\c
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| 72 | .\}
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| 73 | .el \{\
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| 74 | .sp -1
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| 75 | .IP \(bu 2.3
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| 76 | .\}
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| 77 | M
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| 78 | \- BYTES is a number of megabytes
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| 79 | .RE
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| 80 | .sp
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| 81 | .RS 4
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| 82 | .ie n \{\
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| 83 | \h'-04'\(bu\h'+03'\c
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| 84 | .\}
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| 85 | .el \{\
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| 86 | .sp -1
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| 87 | .IP \(bu 2.3
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| 88 | .\}
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| 89 | G
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| 90 | \- BYTES is a number of gigabytes
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| 91 | .RE
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| 92 | .sp
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| 93 | .RE
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| 94 | .RE
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| 95 | .SH "EXAMPLES"
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| 96 | .PP
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| 97 | Synchronize the file data on the [precious] share after every 512 kilobytes (524288 bytes) of data is written:
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| 98 | .sp
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| 99 | .if n \{\
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| 100 | .RS 4
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| 101 | .\}
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| 102 | .nf
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| 103 | \fI[precious]\fR
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| 104 | \m[blue]\fBpath = /data/precious\fR\m[]
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| 105 | \m[blue]\fBvfs objects = commit\fR\m[]
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| 106 | \m[blue]\fBcommit:dthresh = 512K\fR\m[]
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| 107 | .fi
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| 108 | .if n \{\
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| 109 | .RE
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| 110 | .\}
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| 111 | .SH "CAVEATS"
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| 112 | .PP
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| 113 | On some systems, the data synchronization performed by
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| 114 | commit
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| 115 | may reduce performance\&.
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| 116 | .SH "VERSION"
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| 117 | .PP
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| 118 | This man page is correct for version 3\&.0\&.25 of the Samba suite\&.
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| 119 | .SH "AUTHOR"
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| 120 | .PP
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| 121 | 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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