Does rsync check and ignore files that already exist? Post: 302954109

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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

09-04-2015

Registered User

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 SUSE

dpmsgettimeouts

DPMSGetTimeouts(3)						    X FUNCTIONS 						DPMSGetTimeouts(3)

NAME

       DPMSGetTimeouts - retrieves the timeout values used by the X server for DPMS timings

SYNOPSIS

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

       Bool DPMSGetTimeouts
	      (
		    Display *display,
		    CARD16 *standby,
		    CARD16 *suspend,
		    CARD16 *off
	      );

ARGUMENTS

       display
	      Specifies the connection to the X server

       standby
	      Specifies the current standby timeout in seconds

       suspend
	      Specifies the current suspend timeout in seconds

       off    Specifies the current off timeout in seconds

DESCRIPTION

       The DPMSGetTimeouts function retrieves the timeout values used by the X server for DPMS timings.

       The  value  standby is the amount of time of inactivity in seconds before standby mode is invoked. A value of zero indicates that this mode
       has been disabled.

       The value suspend is the amount of time of inactivity in seconds before the second level of power savings is  invoked.	A  value  of  zero
       indicates that this mode has been disabled.

       The  value off is the amount of time of inactivity in seconds before the third and final level of power savings is invoked. A value of zero
       indicates that this mode has been disabled.

RETURN VALUES

       TRUE	      The DPMSGetTimeouts function returns TRUE when values are returned.

       FALSE	      The DPMSGetTimeouts function returns FALSE when no values returned.

SEE ALSO

       DPMSCapable(3), DPMSInfo(3), DPMSSetTimeouts(3)

X Version 11							   libXext 1.1.1						DPMSGetTimeouts(3)

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