Rsync over SSH causing unresponsive NAS

I have a network with many ReadyNAS devices at each of multiple sites. Most of them are ReadyNAS 312's, but there is one older ReadyNAS 102.

 

The RN312's maintain a duplicate of each others critical data using ReadyDR, which provides local access to each site to other sites data.

 

The RN102 doesnt support ReadyDR so I have been using an RSYNC over SSH. This all works swimmingly well... until one of the sites the RN102 backs up to goes offline part way throught an RSYNC.  Each time that happens, the RN102 becomes unresponsive. You cannot connect to it over the file shares, you cannot connect to it over the admin interface and you cannot gracefully shut it down with the power button on the front of the unit. The only way I've found to restore service is to pull the power out of the back of the device. The device has mirrored harddisks, which then need to resync each time it reboots after the power has been disconnected which takes about 12 hours before eveything settles down again. Needless to say, it is quite a remote location and although the drive is pleasant, it's getting rather annoying.

 

My configuration settings for the transfer are 
Source:

  <users share>

Destination:

  Name: remote: Rsycc over Remote SSH, Port: 0, Path: /data/<users share>, Login: <remote login name>

Schedule

  Enabled, Backup every 24 Hours between 6:05pm and 11:05pm, Repeat every day of the week

Advanced

  Enable Compression, Remove deleted files on target, enable FAT32 compatibility mode. DO NOT preserve hard links.

Options

  Full backup every 2 weeks, on completion send errors only

 

This configuration works 95% of the time... only when the connection is interrupted does it become an issue.

 

I am almost at the point where I am going to drop backup to the rest of the network in favour of Dropbox. Any suggestions welcomed on this one.

 

Sorry I should add that all the ReadyNAS units are running Firmware 6.9.3