sync(2) System Calls Manual sync(2)NAME
sync - Updates all file systems
SYNOPSIS
#include <unistd.h>
void sync (void);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
sync(): XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
DESCRIPTION
The sync() function causes all information in memory that should be on disk to be written out. The writing, although scheduled, is not nec-
essarily complete upon return from the sync() function. Types of information to be written include modified superblocks, inodes, data
blocks, and indirect blocks.
The sync() function should be used by programs that examine a file system, such as the df command and the fsck command.
RELATED INFORMATION
Functions: fsync(2)
Commands: sync(8)
Standards: standards(5) delim off
sync(2)
Check Out this Related Man Page
SYNC(2) Linux Programmer's Manual SYNC(2)NAME
sync - commit buffer cache to disk
SYNOPSIS
#include <unistd.h>
void sync(void);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
sync(): _BSD_SOURCE || _XOPEN_SOURCE >= 500
DESCRIPTION
sync() first commits inodes to buffers, and then buffers to disk.
ERRORS
This function is always successful.
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.
NOTES
Since glibc 2.2.2 the Linux prototype is as listed above, following the various standards. In libc4, libc5, and glibc up to 2.2.1 it was
"int sync(void)", and sync() always returned 0.
BUGS
According to the standard specification (e.g., POSIX.1-2001), sync() schedules the writes, but may return before the actual writing is
done. However, since version 1.3.20 Linux does actually wait. (This still does not guarantee data integrity: modern disks have large
caches.)
SEE ALSO bdflush(2), fdatasync(2), fsync(2), sync(8), update(8)COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2007-07-26 SYNC(2)
Hi Linux Admin Guys
My onsite server is always 15 min slow and seems like NTPD (Network Time Protocol (NTP) daemon) not running properly. can anyone suggest me how to rectify this problem? we can't seem to get NTP to properly sync the clock.
Any help is resolving the issue will be helpful.... (12 Replies)
Hello
I have a box with aix 5.3
if I type lsvg -l rootvg all my filesystems are sync except one
rootvg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
hd5 boot 1 2 2 closed/syncd N/A
hd6 paging 32 64 ... (16 Replies)
hi guys
I have multiples linux servers Centos 5.3
the idea is to create a mechanism that when users change his password that new password will change on all linux boxes....
do you have any experience on this?
I know there are scripts to change password for a user but mine is whenever a... (11 Replies)
Dear Guy’s
By using dd command or any strong command, I’d like to copy huge data from file system to another file system
Sours File system: /sfsapp
File system has 250 GB of data
Target File system: /tgtapp
I’d like to copy all these files and directories from /sfsapp to /tgtapp as... (28 Replies)
Hello,
I recently patched my Solaris 10 box and found out that few of the apps are not working. Fortunately, I had detached the mirroring prior to patching, so I just booted into my secondary disk and found that my apps are working....
The problem is this was way back in last month....see... (14 Replies)
Good morning,
My first post and first visit, so hello. I have been asked to see if one of our Linux boxes can have it's time sync automatically because the person who built the system has told our staff it cannot be done. To me that raised some flags because although I am no Linux expert, I just... (12 Replies)
I installed a new kernel 3.0.22 on ubuntu server 11.04 32 bit.
when I select the kenel from boot loader it stops when
Code:
loading initial ramdisk...
I added all_generic_ide at the end of linux line and also added dev/sda1 to linux line: root=UUID=dev/sda1
now it says that
... (12 Replies)
I wanted to know which should be the best way to sync time for a linux machine. We have an application server and a database server, both using RHEL 5.8 as the OS. It is important that the time on both these servers match together and also sync with a common time source. As per my knowledge, these... (11 Replies)
hi all,
i attach a link with what im trying to do automatically via script but i have some questions i need answering please, bear in mind i am really new to bash scripting, the only thing i know how to do is commands in scripts like cd rm tar rsync cp stuff like that
i have mutiple project... (48 Replies)
I am facing an issue of large offset coming from my GPS clock.
I am syncing RHEL 6.3 server by GPS clock through ntpd service. I have too servers of same type and both are syncing independently to the GPS Clock.
>ntpstat of server 1 gives,
Synchronised to unspecified at stratum 15
time... (12 Replies)
Sometimes when I boot, my system goes into emergency mode.
I then use Clonezilla to restore an image.
Usually the image is older than the current date.
This is part of a backup script that runs as a startup program.
cd /home/andy/bin/
zip -u -q Ubuntu_Scripts.zip *.sh *.rb *.c *.py... (22 Replies)
I'm basically looking for the ksh equivalent of bash's PROMPT_COMMAND="history -r", where simply redrawing the command prompt in a terminal will cause ksh to reload the history file.
At the risk of sounding incredibly lazy (in which case I would be guilty as charged), I've noticed that if I have... (13 Replies)
Hello,
I am running a bash script to do an rsync back on a computer running MacOS High Sierra. This is the script I am using,
#!/bin/bash
# main backup location, trailing slash included
backup_loc="/Volumes/Archive_Volume/00_macos_backup/"
# generic backup function
function backup {... (12 Replies)
Someone, please help on this issue:-
Note : for security reason i didn't mention hostnames and ips.
==============================================================================
# ntpstat
unsynchronised
polling server every 1024 s
Ntpstat showing unsynchronised.
... (29 Replies)
Hi,
This is Solaris 9, which is service as NTP server for many unix clients. At backend, it it synching time with three GPS clocks. From past few days, I am noticing time reset to 1 second. Is this a problem ?
I was assuming that if it is a network issue or GPS clock connectivity issue, it... (14 Replies)