Well, I have similar experices in relation to Solaris including _extremely_ poor performace, threading problems/strangness (that affect even console-logging), and repeated core dumps. With Tony's report about his Solaris troubles, I feel safe to exclude DCO2 as the mayor culprit. So...
Would it be reasonable to conclude that it **currently is not possible to deploy a High Availability Solaris based Zope solution**? I have build serveral Zope sites under Solaris (for my old employer).
All have been slow, much slower than expected, but have been reasonably stable. * Some lightly loaded sites sometimes stopped answering. The problem disappeared almost completely, when they were regularly checked..... * For the main production site, Zope was much more stable than the Oracle backend database. Most outages was caused by Oracle problems calling for frequent Oracle restarts. After an Oracle restart, Zope needed to be restarted, too. Threading was definitely working. Dieter