Yeah, unfortunately rsync's --checksum doesn't even employ obvious
optimizations that the man page says it does. There is no reason for it
to checksum files that only exist on one end or are different in sizes
yet it does. Just try doing an rsync of a huge tree to an empty dir.
You won't run out of space. You will get tired of waiting for it to do
something and abort it.
On 7/15/22 02:57, Robin Lee Powell wrote:
--checksum is only slower than re-copying if your network connection
between the hosts is similar in speed (or faster than) each host's
local disk access.
If local disk access is 10x your network link, it is definitely not
slower than re-copying.
Having said that, it really is *very* slow, and before you use it
you should have a clear situation in mind that makes it plausible that
two files could have the same size and last mod time and still not
have the same data.
Or, alternately, be in a situation where a bit flip would be
catastrophic. Such situations are not common.
On Thu, Jul 14, 2022 at 04:26:48AM -0400, Kevin Korb via rsync wrote:
You should almost never use --checksum. It is slower than just re-copying
everything. You should almost always use --times (or --archive which
includes --times). Without this rsync is almost as dumb as cp. Also, ssh
has been the default --ssh for a long time.
On 7/14/22 04:22, Fourhundred Thecat via rsync wrote:
Hello,
I want to sync local folder to remote server. When I run follwing
command repeatedly, it always transfers everything each time again and
again:
rsync --rsh='ssh' foo/ server:/foo/
does it mean I have to always use either --checksum or --times, to
prevent repeated transfer of files that have not changed ?
thank you,
--
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Kevin Korb Phone: (407) 252-6853
Systems Administrator Internet:
FutureQuest, Inc. ke...@futurequest.net (work)
Orlando, Florida k...@sanitarium.net (personal)
Web page: https://sanitarium.net/
PGP public key available on web site.
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