'\" t
.\"     Title: vfs_prealloc
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 03/20/2019
.\"    Manual: System Administration tools
.\"    Source: Samba 4.9.5-Debian
.\"  Language: English
.\"
.TH "VFS_PREALLOC" "8" "03/20/2019" "Samba 4\&.9\&.5\-Debian" "System Administration tools"
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.SH "NAME"
vfs_prealloc \- preallocate matching files to a predetermined size
.SH "SYNOPSIS"
.HP \w'\ 'u
vfs objects = prealloc
.SH "DESCRIPTION"
.PP
This VFS module is part of the
\fBsamba\fR(7)
suite\&.
.PP
The
vfs_prealloc
VFS module preallocates files to a specified size each time a new file is created\&. This is useful in environments where files are of a predetermined size will be written to a disk subsystem where extending file allocations is expensive\&.
.PP
This module is stackable\&.
.SH "OPTIONS"
.PP
prealloc:EXT = BYTES
.RS 4
Preallocate all files with the extension EXT to the size specified by BYTES\&.
.sp
The following suffixes may be applied to BYTES:
.RS
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
K
\- BYTES is a number of kilobytes
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
M
\- BYTES is a number of megabytes
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
G
\- BYTES is a number of gigabytes
.RE
.sp
.RE
.RE
.SH "EXAMPLES"
.PP
A process writes TIFF files to a Samba share, and the is known these files will almost always be around 4 megabytes (4194304 bytes):
.sp
.if n \{\
.RS 4
.\}
.nf
        \fI[frames]\fR
	\m[blue]\fBpath = /data/frames\fR\m[]
	\m[blue]\fBvfs objects = prealloc\fR\m[]
	\m[blue]\fBprealloc:tiff = 4M\fR\m[]
.fi
.if n \{\
.RE
.\}
.SH "CAVEATS"
.PP
vfs_prealloc
is not supported on all platforms and filesystems\&. Currently only XFS filesystems on Linux and IRIX are supported\&.
.SH "VERSION"
.PP
This man page is part of version 4\&.9\&.5\-Debian of the Samba suite\&.
.SH "AUTHOR"
.PP
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\&.