[PLUG] 3-way data mirror?

[JP Vossen <jp@jpsdomain.org>]

I have a situation where I have 2 labs that need to keep ~150G of data 
in sync, but they can't talk to each other.  They can talk to a 3rd 
machine, which is also backed up, so...

What I think I'd like to do is have:

	Lab1 <--> COLO <--> Lab2

The problem is that lab1 and lab2 are both read-write, so there is a 
real possibility of stepping on changes.  COLO is read-only.

I'd try to just relay through the COLO, but that's also where the backup 
will happen.  And I can't get the FW rules changed.

Any better ideas?

Any suggestions on tools?  I'd strongly prefer something already in the 
CentOS-5 or EPEL repos.

Thanks,
JP
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