viewtopic.php?f=17&t=66275&p=300633#p290885
my /opt/zimbra/zmstat/zmstat.out grew 250GB in a couple of hours.
It was full of this error:
You need to edit /opt/zimbra/libexec/zmstat-io to fix the issue.Use of uninitialized value $line in pattern match (m//) at /opt/zimbra/libexec/zmstat-io line 76.