We also have (or are trying to) configure Pragma with two SFTP servers in a load balanced configuration.  It's not clear what you are referring to by keeping the file systems in synch, but for the storage of the actual FTP files we have a clustered file server to which our SFTP servers read/write the files.

The problem we have is keeping the users' public keys synchronised between the two servers. Storing them in the registry is not going to work and we are having trouble with pragma if we place them on the fileserver.  We want to avoid our users having to provide the public keys twice as it will be confusing to them since they only see one URL (and a lot of systems are also automated). 

Do you have this problem and if so how did you solve it?

I have 2 sftp servers sitting on my dmz.  I was going to load balance/HA configure them since they are currently each a stand-alone solution.  I can use the F5 to create a vip and assign it to a dns name on the outside of my firewall... the trouble is, how do I keep both servers file systems in synch?  anyone do this before?  the pragma software doesn't appear to have this feature, or I haven't found it yet :-)   if the data drives were synchronized every few minutes I could just let the F5 handle the inbound traffic, and my Tidal app on the inside can sweep 1 server for files (also using a dns name on the inside. 

thanks in advance