This is a corollary question to How to verify that rsync copied the device correctly when copy-devices is enabled?

When reattempting a transfer (using the --copy-devices) flag and two levels of verbosity -vv, I got this output:

sudo rsync -vvz --partial --progress --copy-devices /dev/sdb me@otherserver:/backupdisks/mydisk.img
delta-transmission enabled
320,071,851,520 100%   63.47MB/s    1:20:09 (xfr#1, to-chk=0/1)
total: matches=2441955  hash_hits=2441955  false_alarms=204015955 data=0

sent 188 bytes  received 21,979,001 bytes  2,837.31 bytes/sec
total size is 0  speedup is 0.00

What do the "matches", "hash_hits", and "false_alarms" values mean, and does "data=0" mean?

Has the transfer been successful or not?

  • See my answer to your previous question that you link to. – meuh Oct 26 '16 at 14:36

As per https://lists.samba.org/archive/rsync/2004-November/011057.html

false_alarms just tells you how many blocks had a matching weak checksum that did not match when the strong checksum was compared.

rsync only mentions this stat if debugging levels of verbosity are set

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