User's Manual

Special OpenVMS-Specific Features and Considerations
Core Activation and Deactivation
Unlike HP-UX, the OpenVMS operating system provides a user interface to start and stop system
processor resources. When you enter the START /CPU command on an OpenVMS system in a
complex containing iCAP resources, the ICAP_SERVER process validates that the start operation
does not take the complex out of compliance. When you enter the STOP /CPU command, the
CPU might restart at a later time if the count of intended active cores on the system is greater
than the actual active cores.
IMPORTANT: The ICAP command or the corresponding HP-UX foreign commands must be
used on OpenVMS systems when stopping and starting in complexes containing iCAP
components. Using the START /CPU command can result in unintended consequences, such as
an unexpected usage of temporary capacity or the deactivation of cores on the system or on
another system in the complex. Using the STOP /CPU command can result in an unexpected
restart of the core or the unexpected start of a core in another system in the complex.
To start cores on OpenVMS, use the ICAP ACTIVATE/CPU= command. To stop cores on
OpenVMS, use the ICAP DEACTIVATE/CPU= command.
Email Considerations
The iCAP software requires that SMTP mail be configured on the OpenVMS system to send
email to the system contact. For more information about setting up SMTP mail, see your IP
provider’s documentation.
220 Considerations for OpenVMS Systems