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 4.0 06/17/2014 VFS_COMMIT(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 4.0 06/17/2014 VFS_PREALLOC(8)
Hi expert,
I have log :
TOTAL-TIME : 2125264636
DATA-BYTES-DOWN : 3766111307032
DATA-BYTES-UP : 455032157567
DL = (3766111307032/2125264636)/1024 = 1.73
UL = (455032157567/2125264636)/1024 = 0.21
I want the result :
TOTAL = 1.94 ... (4 Replies)