[Box Backup] Two backup-servers

Markus Liljergren boxbackup@fluffy.co.uk
Sun, 27 Jan 2008 16:24:10 +0100

Hi All,

I'm trying to figure out the best way to deploy BoxBackup as a service 
for my servers. All services provided by my servers have redundancy in 
the way that there is always another server ready to take over one or 
more services in the event of one server failing to provide its assigned 
When implementing BoxBackup in this setup I would like to have all data 
stored on two different servers (with limited bandwidth between them, 
for example NFS-based solutions would not work well). It would be 
preferable if the clients didn't have to backup to the two servers 
separately. I would like to synchronize the data from one server to the 
other, if the master-server (the one clients connect to) goes down the 
corresponding DNS-entries will change to the secondary server and let 
the clients connect there. The moment the secondary takes over it will 
be considered the master-server, when the original master-server is back 
online a synchronization back to it will be run after which it regains 
it master-server status. If the clients have to send some data already 
sent because of some data missing on the server that wouldn't be a big 
problem, since it only occurs when one server is down.
The question I have, is it possible to do it in this or a similar way 
without risk of corruption due to incomplete syncs on server-failure?
Should I just abandon this and have the clients send backups to two 
different servers?

Any thoughts would be very much appreciated.

Best Regards,
Markus Liljergren