I want to change the notification value, I'm tired of zimbra blowing up my administrator account with notification that /dev/sda1 is low on disk space.
I already know this.

I've searched in the docs, and found how to change it.

Monitoring Disk Space

But it doesn't work, either I'm doing it wrong or it's not up-to-date.

I keep getting

Code:
[zimbra@fileserver ~]$ zmlocalconfig "zmdisklog_warn_threshold = 97"
Warning: null valued key 'zmdisklog_warn_threshold = 97'
[zimbra@fileserver ~]$ zmlocalconfig zmdisklog_warn_threshold = 97
Warning: null valued key 'zmdisklog_warn_threshold'
Warning: null valued key '='
Warning: null valued key '97'
I want to change...
zmdisklog_warn_threshold to 97
zmdisklog_critical_threshold to 99

How do I do it?