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Full Discussion: Does rsync check and ignore files that already exist?
Top Forums UNIX for Dummies Questions & Answers Does rsync check and ignore files that already exist? Post 302954109 by newbie_01 on Friday 4th of September 2015 09:58:16 AM
Old 09-04-2015
Does rsync check and ignore files that already exist?
Hi,

We have two (2) servers named primary and standby. There is a directory named /db01/archive that we need to keep in-sync.

Files get transferred from primary and standby. Sometimes when we do a failover or when there is a network issue, some files fail to get transferred.

I want to use rsync to sync the files between the primary and the standby. Does rsync checks and ignores files that already exist on each server or does it check if a file has been modified, is therefore newer and then copy it over?

For example, if file01 to file10 are on the primary and file01 to file05 is already on the standby and a network error happens where file06 to file10 were not transferred and I run rsync, can I use rsync to tell it to copy file06 to file10 because they are missing and copy file01 to file05 only if they had been modified and are now newer than the files that are already in the standby?

Similarly, if we failed over from primary to standby and standby has the file11 to file15 and file13 is missing on primary, can I this time run rsync to copy files from the standby to primary where it only copy over file13 and the rest of the other files BUT only if they had been modified and are now newer than the files that are in the primary.

Basically, what I am ultimately hoping to use rsync with is being able to tell it which of the servers is the source and which one is the target whenever I run rsync. I need to be able to do so since because the role between the servers changes when a failover occurs. Is this possible?

Any advice much appreciated. Thanks in advance.
 

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LEARN ABOUT X11R4

dpmssettimeouts

DPMSSetTimeouts(3)						    X FUNCTIONS 						DPMSSetTimeouts(3)

NAME

       DPMSSetTimeouts - permits applications to set the timeout values used by the X server for DPMS timings

SYNOPSIS

       cc [ flag ... ] file ... -lXext [ library ... ]
       #include <X11/extensions/dpms.h>

       Status DPMSSetTimeouts
	      (
		    Display *display,
		    CARD16 standby,
		    CARD16 suspend,
		    CARD16 off
	      );

ARGUMENTS

       display
	      Specifies the connection to the X server

       standby
	      Specifies the new standby timeout in seconds

       suspend
	      Specifies the new suspend timeout in seconds

       off    Specifies the new off timeout in seconds

DESCRIPTION

       The  DPMSSetTimeouts  function  permits	applications to set the timeout values used by the X server for Display Power Management Signaling
       (DPMS) timings.

       The value standby is the amount of inactivity time, in seconds, before standby mode is invoked. The actual effects of this mode are  depen-
       dent  on  the characteristics of the monitor and frame buffer card. Standby mode is implemented by shutting off the horizontal sync signal,
       and pulsing the vertical sync signal. Standby mode provides the quickest monitor recovery time.	Note also  that  many  monitors  implement
       this mode identical to suspend mode.  A value of zero disables the standby mode.

       The  value  suspend  is	the  amount of time of inactivity, in seconds, before the second level of power savings is invoked. Suspend mode's
       physical and electrical characteristics are implementation defined. For DPMS compliant hardware, setting the suspend mode is implemented by
       pulsing the horizontal sync signal and shutting off the vertical sync signal.  In general, suspend mode recovery is considered to be slower
       than standby mode, but faster than off mode. However it may vary from monitor to monitor.  As noted above,  many  monitors  implement  this
       mode identical to the standby mode.  A value of zero disables this mode.

       The  value  off	is  the  amount of time of inactivity,in seconds, before the third and final level of power savings is invoked. Off mode's
       physical and electrical characteristics are implementation defined. In DPMS compliant hardware, it is implemented by shutting off both hor-
       izontal	and  vertical  sync  signals,  resulting in powering down of the monitor.  Recovery time is implementation dependent.  Usually the
       recovery time is very close to the power-up time of the monitor. A value of zero disables this mode.

       Chronologically, standby mode occurs before or simultaneously with suspend mode, and suspend mode must occur before or simultaneously  with
       off  mode.   Therefore, non-zero mode timeout values must be greater than or equal to the timeout values of earlier modes.  If inconsistent
       values are supplied, a BadValue error will result.

RETURN VALUES

       TRUE	      The DPMSSetTimeouts function returns TRUE when the function has succeeded.

ERRORS

       BadValue       An argument is out of range.

SEE ALSO

       DPMSCapable(3), DPMSInfo(3), DPMSGetTimeouts(3)

X Version 11							   libXext 1.0.5						DPMSSetTimeouts(3)
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