Edit: I'm going to put my Zabbix instance on it later and see how it does.
Databases should not be compressed!
Details as to why databases should not be compressed?
Basically because they are always open and written to incrementally. They aren't loaded and rewriteen like most files are. And they tend to be very large, so a very intensive usage pattern.
True. But this compression is being done on the Host OS, not inside the Zabbix VM. I wonder what kind of strangeness this can cause. I don't have a lot of traffic on this particular server.
That doesn't affect anything. Compression is compression.
I'll find out what kind of performance hits I take with it on ZFS. So far, I'm seeing some nice space savings and no problems with anything else.