Normally, existing files in destination are never updated from link-dest
but are transferred over the wire. This patch changes that behaviour to
use link-dest instead, which is a major performance enhancement in our
2. Warnings for --max-size ignored files are displayed if -w/--warning
by Rowan McKenzie (CSIRO SC)
Warnings for -max-size ignored files are displayed if -w/-warning is
specified. Normally, -max-size causes files to be silently ignored!
3. Only output '=>' notifications when -v/--verbose specified
by Rowan McKenzie (CSIRO SC)
Only output '#' notifications when -v/-verbose specified (it's a patch
to the rsync_link_dest_from_bryant patch). This reduces clutter by
suppressing a large class of false positives.:
Hope you can find these.
(All we need now for rsync perfection for our backups is a solution to
the problem of metadata changes being propagated across all directories
for hard-linked files - we would rather new copies be made than lose the
Dr Robert C. Bell
HPC National Partnerships | Scientific Computing
Information Management and Technology
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---------- Forwarded message ----------
Date: Mon, 6 Apr 2015 01:51:21 -0400
From: Ken Chase <[hidden email]>
To: [hidden email] Subject: rsync --link-dest won't link even if existing file is out of date
Feature request: allow --link-dest dir to be linked to even if file exists
This statement from the man page is adhered to too strongly IMHO:
"This option works best when copying into an empty destination hierarchy, as
rsync treats existing files as definitive (so it never looks in the link-dest
dirs when a destination file already exists)".
I was suprised by this behaviour as generally the scheme is to be efficient/save
space with rsync.
When the file is out of date but exists in the --l-d target, it would be great
if it could be removed and linked. If an option was supplied to request this
behaviour, I'd actually throw some money at making it happen. (And a further
option to retain a copy if inode permissions/ownership would otherwise be
I backup many servers with --link-dest that have filesystems of 10+M files on
them. I do not delete old backups - which take 60min per tree or more just so
rsync can recreate them all in an empty target dir when <1% of files change
per day (takes 3-5 hrs per backup!).
Instead, I cycle them in with mv $olddate $today then rsync --del --link-dest
over them - takes 30-60 min depending. (Yes, some malleability of permissions
risk there, mostly interested in contents tho). Problem is, if a file exists
AT ALL, even out of date, a new copy is put overtop of it per the above man
Thus much more disk space is used. Running this scheme with moving old backups
to be written overtop of accumulates many copies of the exact same file over
time. Running pax -rpl over the copies before rsyncing to them works (and
saves much space!), but takes a very long time as it traverses and compares 2
large backup trees thrashing the same device (in the order of 3-5x the rsync's
time, 3-5 hrs for pax - hardlink(1) is far worse, I suspect a some non-linear
algorithm therein - it ran 3-5x slower than pax again).