rsync - Jul 2011 - How to call rsync client so that is detects that server has gone away?

Hi Larry,
Your tech details are way beyond my knowledge, but maybe python can do
the job for you too? I use this python script (from the python
cookbook) and crontab to keep my sheep in the dry:

#!/usr/bin/env python
#wraps up rsync to synchronize two directories
# ! -- should contain check of disk space using rsync -n option for drytest !
from subprocess import call
import sys
import time

"""this motivated rsync tries to synchronise
forever"""

source = "/media/rsync_gb01/movies/" #note the trailing slash!
target = "bjorn at srv01:/home/bjorn/movies"
rsync = "rsync"
arguments = "-avz --timeout=60 --delete"
cmd = "%s %s %s %s" % (rsync, arguments, source, target)

def sync():
	while True:
		ret = call(cmd, shell=True)
		if ret !=0:
			print "resubmitting rsync"
			time.sleep(30)
		else:
			print "rsync was succesful"
			#subprocess.call("MAIL -s 'jobs done'
bjorn.madsen at operationsresearchgroup.com", shell=True)
			sys.exit(0)
sync()

# Running in crontab since 29/6/2011 10:07
# Dry-run Testline: rsync -avzn --stats --timeout=60
/media/rsync_gb01/movies/ bjorn at srv01:/home/bjorn/movies



---------- Forwarded message ----------
From:?Larry Irwin <mkitwrk at gmail.com>
To:?rsync at lists.samba.org
Date:?Tue, 12 Jul 2011 14:50:01 -0400
Subject:?How to call rsync client so that is detects that server has gone away?
?Hi All,
I have an rsync client that is not re-starting and/or timing out when
the server processes die/go away...
The client is rsync ?version 3.0.4 ?protocol version 30, natively
compiled on Debian 6, kernel 2.6.32.5-amd64.
The server is a QNAP NAS device running rsync version 3.0.6 protocol version 30.
(I can change the client version if I need to, but not the version on
the QNAP device)
I am trying to rsync ~700gb to the QNAP device, hopefully once per day.
There are ~40,000,000 files, many of them rsync-snapshot hard-links.
It takes a long time, so I'm using LVM2 snapshots to get static views
of the data partitions.
I need to preserve the links or the destination size will multiply by
a factor of 6 or so...
The command I am using on the client is:
nice -n 19 rsync -ave "ssh -l ${LOGIN} -p ${PORT}" --links
--hard-links --perms --times --owner --group --delete --stats
--exclude-from=${RSHOME}/cfg/rsyncbackup.exclude
--link-dest=${LINKDEST} / ${LOGIN}@${IPADDRESS}:..${DEST} 2>&1 | gzip
-9 > ${LOGNAME}
The client and the QNAP are connected on the LAN with 1Gb NIC's on Gb
switches.
When/if the server's rsync processes die (for an unknown reason at
this point), I'd love for the client to recognize this fact and
jump-start the server processes to pick up where they left off.
If not that, at least to quit and exit in a reasonable fashion...
At this moment, it is 2:45pm: The rsync started at 9:00am - the server
processes went away at 12:33 PM - the client processes are still
running...
Any ideas would be greatly appreciated.
Thanks,
Larry Irwin