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vfs_cacheprime(8) [suse man page]

VFS_CACHEPRIME(8)					    System Administration tools 					 VFS_CACHEPRIME(8)

NAME

       vfs_cacheprime - prime the kernel file data cache

SYNOPSIS

       vfs objects = cacheprime

DESCRIPTION

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

       The vfs_cacheprime VFS module reads chunks of file data near the range requested by clients in order to make sure the data is present in
       the kernel file data cache at the time when it is actually requested by clients.

       The size of the disk read operations performed by vfs_cacheprime is determined by the cacheprime:rsize option. All disk read operations are
       aligned on boundaries that are a multiple of this size. Each range of the file data is primed at most once during the time the client has
       the file open.

       This module is stackable.

OPTIONS

       cacheprime:rsize = BYTES
	   The number of bytes with which to prime the kernel data cache.

	   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

       For a hypothetical disk array, it is necessary to ensure that all read operations are of size 1 megabyte (1048576 bytes), and aligned on 1
       megabyte boundaries:

		[hypothetical]
		vfs objects = cacheprime
		cacheprime:rsize = 1M

CAVEATS

       cacheprime is not a a substitute for a general-purpose readahead mechanism. It is intended for use only in very specific environments where
       disk operations must be aligned and sized to known values (as much as that is possible).

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_CACHEPRIME(8)

Check Out this Related 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)
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