Availability

Description: z/OS® Communications Server includes the following enhancements for availability and business resilience:

• Activating Trace Resolver without restarting applications - The Resolver CTRACE TRACERES option is provided to collect Trace Resolver output as Resolver CTRACE records. You can use the Resolver CTRACE TRACERES option to dynamically enable or disable collection of Trace Resolver output for one or more applications without stopping and then restarting the application. You can also use the Resolver CTRACE TRACERES option to trace Resolver activity in address spaces that have multiple tasks or address spaces that generate many Resolver API calls. You can use IPCS CTRACE subcommand processing to view the formatted component trace data from a dump, or from an external ctrace data set.

  When change was introduced: z/OS V2R2

• Reordering of cached resolver results - Cache support for the system resolver is enhanced. You can configure the resolver to enable reordering of a cached list of IP addresses that is returned in response to a host name resolution request. You can also disable the reordering function on a system-wide basis, or on an individual application basis.

  When change was introduced: z/OS V2R2

Reference information: See the following topics in z/OS Communications Server: New Function Summary for detailed descriptions that include any applicable restrictions, dependencies, and steps on using the functions:

• Activating Trace Resolver without restarting applications
• Reordering of cached resolver results