[rdiff-backup-users] Connection Read Error

[Bob Mead]

Hello list:

I'm almost afraid to post this, but here goes. I have another backup 
which is now failing. This one last worked on 3/30 and has since given 
only "Previous backup seems to have failed, regressing destination now 
messages". If I understand the expected behavior of rdiff correctly, I 
should only see this if the previous attempt to backup has failed. Why 
do I get these messages immediately after a successful backup, i.e. the 
next attempt to backup fails? And, lastly: is there a mechanism in rdiff 
to tell me that the regression has completed successfully? I've never 
seen any messages regarding the completion of the regression. I'm going 
to guess that repeated attempts to backup have failed and that is the 
reason why I am still seeing 'regressing now' messages.

The scenario: 'push' style backup, origin server is Linux 
2.6.7-gentoo-r5 #5 SMP Mon Feb 6 16:54:19 PST 2006 i686 Intel(R) 
Xeon(TM) CPU 2.40GHz GenuineIntel GNU/Linux running rdiff v1.0.4, 
destination server is Linux 2.6.15-51-amd64-server #1 SMP Tue Feb 12 
17:08:38 UTC 2008 x86_64 GNU/Linux running rdiff v1.0.4.

Destination directory is NFS mounted to the destination server (original 
server ran out of space). I've set both rsize and wsize to 16384 and 
timeo to 50 for the nfs mount to improve performance and these settings 
have not changed since the backup last worked. Other backups I run daily 
using this exact scenario (same destination server [also using the nfs 
mount], different origin servers using the same version of rdiff) are 
working just fine.

Rdiff runs as a cron job daily using the following script/commands:
rdiff-backup --print-statistics --exclude-special-files --exclude 
'**tmp' --exclude /var/log --include /etc --include /home --include /var 
--include /root --exclude / / root@<server name>::/home/space/backups/oak
rdiff-backup --remove-older-than 2M root@<server 
name>::/home/space/backups/oak

output:
Previous backup seems to have failed, regressing destination now.
Traceback (most recent call last):
 File "/usr/bin/rdiff-backup", line 23, in ?
   rdiff_backup.Main.Main(sys.argv[1:])
 File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 
285, in Main
   take_action(rps)
 File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 
255, in take_action
   elif action == "backup": Backup(rps[0], rps[1])
 File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 
299, in Backup
   backup_final_init(rpout)
 File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 
396, in backup_final_init
   checkdest_if_necessary(rpout)
 File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 
903, in checkdest_if_necessary
   dest_rp.conn.regress.Regress(dest_rp)
 File "/usr/lib/python2.4/site-packages/rdiff_backup/connection.py", 
line 445, in __call__
   return apply(self.connection.reval, (self.name,) + args)
 File "/usr/lib/python2.4/site-packages/rdiff_backup/connection.py", 
line 367, in reval
   if isinstance(result, Exception): raise result
OSError: [Errno 17] File exists: '/home/space/backups/oak/home/kstewa11'
Traceback (most recent call last):
 File "/usr/bin/rdiff-backup", line 23, in ?
   rdiff_backup.Main.Main(sys.argv[1:])
 File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 
285, in Main
   take_action(rps)
 File "/usr/lib/python2.4/site-packages/rdiff_backup/Main.py", line 
253, in take_action
   connection.PipeConnection(sys.stdin, sys.stdout).Server()
 File "/usr/lib/python2.4/site-packages/rdiff_backup/connection.py", 
line 352, in Server
   self.get_response(-1)
 File "/usr/lib/python2.4/site-packages/rdiff_backup/connection.py", 
line 314, in get_response
   try: req_num, object = self._get()
 File "/usr/lib/python2.4/site-packages/rdiff_backup/connection.py", 
line 230, in _get
   raise ConnectionReadError("Truncated header string (problem "
rdiff_backup.connection.ConnectionReadError: Truncated header string 
(problem probably originated remotely)

Thanks,
   ~bob

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