I have checksum caching enabled, but it is hashing out the entire hard
drive of both the server and the client during a full backup. My
understanding is that when checksum caching is enabled BackupPC is only
suppose to checksum a portion of the files during a full backup, not all
of them.
I verified the disk usage by using "iotop -a" (a disk usage utility) on
both the client and the server, starting it when the full backup started
and checking it every so often. It showed the total disk usage of the
backup (rsync) at nearly the total size of all files in the backup. ie,
it is reading all the files again.
I have --checksum-seed=32761 set, and $Conf{RsyncCsumCacheVerifyProb} is
0.01, both in the main config with no client based overrides.
Using version 3.2.1 on Fedora 16.
The documentation says the checksum caching will be disabled if a "phase
0 failure" happens. Is that referring to a level 0 (full) backup? Would
that include a user cancellation of a backup. Sometimes I will manually
cancel backups through the cgi because they start when I am working.
Here are the top of the backups logs, to show checksum is enabled:
---- First Backup----
full backup started for directory /home
Running: /usr/bin/ssh -q -x -l root clientname /usr/bin/rsync --server
--sender --numeric-ids --perms --owner --group -D --links --hard-links
--times --block-size=2048 --recursive --checksum-seed=32761
--ignore-times . /home/
Xfer PIDs are now 11745
Got remote protocol 30
Negotiated protocol version 28
Checksum caching enabled (checksumSeed = 32761)
Sent Exclude...
---- Latest Backup ----
full backup started for directory /home (baseline backup #19)
Running: /usr/bin/ssh -q -x -l root clientname /usr/bin/rsync --server
--sender --numeric-ids --perms --owner --group -D --links --hard-links
--times --block-size=2048 --recursive --checksum-seed=32761
--ignore-times . /home/
Xfer PIDs are now 13057
Got remote protocol 30
Negotiated protocol version 28
Checksum caching enabled (checksumSeed = 32761)
Sent Exclude...
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