Okay, the Zimbra server processes finally finished shutting down and RAM and CPU usage is back to normal so I can finally look around at the command prompt.
Looking through /var/log/zimbra.log (I didn't realize that was there), I see a bunch of messages like these throughout the night:
postfix/showq[31035]: fatal: select lock: Resource temporarily unavailable
postfix/tlsmgr[31034]: fatal: cannot lock PRNG exchange file /opt/zimbra/postfix-2.2.9/conf/prng_exch: Resource temporarily unavailable
Jun 29 01:30:24 plato postfix/master[4252]: warning: process /opt/zimbra/postfix-2.2.9/libexec/showq pid 31035 exit status 1
postfix/master[4252]: warning: /opt/zimbra/postfix-2.2.9/libexec/showq: bad command startup -- throttling
postfix/master[4252]: warning: process /opt/zimbra/postfix-2.2.9/libexec/tlsmgr pid 31034 exit status 1
postfix/master[4252]: warning: /opt/zimbra/postfix-2.2.9/libexec/tlsmgr: bad command startup -- throttling
slapd[3753]: is_entry_objectclass("", "2.5.6.1") no objectClass attribute
These messages occur over and over again throughout the night (like once a minute).
Where else should I look that might help indicate what was going on?
Thanks
--Dan  |