Configuring the system for additional users and CPUs

Release Notes
Chapter 2, Read this after installation

When you add users to your SCO OpenServer system, the demand on various system resources increases. When you license additional users with the License Manager, it prompts you, just before exiting, to tune kernel resources to accommodate the higher demand. We strongly recommend that you allow the License Manager to tune the resources for you. Once the resources are tuned, the License Manager prompts you to relink the kernel. Relinking the kernel at this point ensures that the modifications are saved. To activate the modified kernel, reboot the system.

NOTE: When you add SCO User Licenses, the License Manager tunes a basic set of kernel resources. Refer to the Performance Guide for detailed information on tuning the kernel to match the needs of your particular system configuration.

When you remove SCO User Licenses, the License Manager does not tune the kernel to reflect the change in demand on system resources.

When you license or unlicense one or more additional CPUs, the License Manager modifies the MAXACPUS kernel parameter automatically. Therefore, before exiting, the License Manager prompts you to relink the kernel. Relinking the kernel at this point ensures that the required modification is saved. To activate the modified kernel, reboot the system.

WARNING: If you have installed SCO Symmetrical Multiprocessing Support, and any additional CPUs are licensed, all additional CPUs must be licensed at the same time. Failure to do so might cause some systems to hang when you reboot.

License Manager and kernel parameters

When new user licenses are added to the system, the License Manager automatically adjusts the following kernel parameters according to the number of users by calling the /etc/tunek utility:

serial I/O parameters: NCLIST, TTHOG
Streams memory parameters: NSTREAM, NMUXLINK, NSTREVENT, NSTRPAGES
number of Stream pipe connections: NUMSP
number of pseudo-ttys: NSPTTYS
number of TCP/IP and UNIX domain sockets: NSOCKET, NUSOCOTS (These kernel parameters can be modified with /etc/tunek only; they cannot be modified with configure(ADM).)

If your system is licensed for more than 5 users and you did not use the License Manager to add the user licenses, you may need to run the /etc/tunek utility from the command line. See SCO Technical Article #104929 at http://www.sco.com/ta. See ``Configuration tools'' in the Performance Guide for more information.

The License Manager also increments the MAXACPUS kernel parameter when additional CPUs are added, so you might need to modify this parameter if you failed to run the License Manager. (The base processor is not included in the count of CPUs.)