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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 REDHAT

apm

APM(1)							     Linux Programmer's Manual							    APM(1)

NAME

       apm - query Advanced Power Management (APM) BIOS

SYNOPSIS

       apm [ -vVmsS ]

DESCRIPTION

       apm  reads /proc/apm and presents the output in a human-readable format.  Since primarily battery status information is provided, this com-
       mand is most useful on laptops with a compliant APM BIOS.  apm also allows the machine to be put into standby or suspend mode.

OPTIONS

       -V, --version
	      Print the apm program version and exit immediately.

       -v, --verbose
	      Print information about the APM BIOS version and Linux APM driver version.

       -m, --minutes
	      Print total minutes remaining instead of using an hh:mm format.

       -s, --suspend
	      Put the machine into suspend mode if possible.

       -S, --standby
	      Put the machine into standby mode if possible.

       -i, --ignore
	      Tell the system to ignore system-generated APM suspend and standby events when on AC power.  This may be useful to  users  who  have
	      laptops and want APM events when on battery power, but not when on AC power.

       -n, --noignore
	      Tell  the  system  not  to  ignore system-generated APM suspend and standby events when on AC power.  This is the default mode; this
	      option is provided as a way to undo a prior "apm -i" call.

       BUGS   This program requires a post-1.3.57 kernel.  This program will not work with older kernels or with the APM patches, since the format
	      for /proc/apm has changed radically.

FILES

       /proc/apm
       linux/drivers/char/apm_bios.c

AUTHOR

       This  program  was written by Rik Faith (faith@cs.unc.edu) and may be freely distributed under the terms of the GNU General Public License.
       There is ABSOLUTELY NO WARRANTY for this program.  The current maintainer is Avery Pennarun (apenwarr@worldvisions.ca).

SEE ALSO

       xapm(1), apmd(8)

								    10 Jan 1996 							    APM(1)
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