vfs_prealloc(8) [suse man page]

VFS_PREALLOC(8) 					    System Administration tools 					   VFS_PREALLOC(8)

NAME

       vfs_prealloc - preallocate matching files to a predetermined size

SYNOPSIS

       vfs objects = prealloc

DESCRIPTION

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

       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.

       This module is stackable.

OPTIONS

       prealloc:EXT = BYTES
	   Preallocate all files with the extension EXT to the size specified by BYTES.

	   The following suffixes may be applied to BYTES:

	   o   K - BYTES is a number of kilobytes

	   o   M - BYTES is a number of megabytes

	   o   G - BYTES is a number of gigabytes

EXAMPLES

       A process writes TIFF files to a Samba share, and the is known these files will almost always be around 4 megabytes (4194304 bytes):

		   [frames]
		path = /data/frames
		vfs objects = prealloc
		prealloc:tiff = 4M

CAVEATS

       vfs_prealloc is not supported on all platforms and filesystems. Currently only XFS filesystems on Linux and IRIX are supported.

VERSION

       This man page is correct for version 3.0.25 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 3.5							    06/18/2010							   VFS_PREALLOC(8)

VFS_COMMIT(8)						    System Administration tools 					     VFS_COMMIT(8)

NAME

       vfs_commit - flush dirty data at specified intervals

SYNOPSIS

       vfs objects = commit

DESCRIPTION

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

       The vfs_commit VFS module keeps track of the amount of data written to a file and synchronizes it to disk when a specified amount
       accumulates.

       vfs_commit 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.

       This module is stackable.

OPTIONS

       commit:dthresh = BYTES
	   Synchronize file data each time the specified number of bytes has been written.

	   The following suffixes may be applied to BYTES:

	   o   K - BYTES is a number of kilobytes

	   o   M - BYTES is a number of megabytes

	   o   G - BYTES is a number of gigabytes

EXAMPLES

       Synchronize the file data on the [precious] share after every 512 kilobytes (524288 bytes) of data is written:

		   [precious]
		path = /data/precious
		vfs objects = commit
		commit:dthresh = 512K

CAVEATS

       On some systems, the data synchronization performed by commit may reduce performance.

VERSION

       This man page is correct for version 3.0.25 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 3.5							    06/18/2010							     VFS_COMMIT(8)