System information

Chapter 10. Using the Advanced Systems Management Interface 329
For System i5 systems running as a single server image this has much less impact. You will
seldom need to be concerned with granularity of the memory because you have
all of the
system’s memory assigned to a single partition.
Changing logical memory block size
Using the panel shown in Figure 10-78 you can select a new Setting value for the memory
block size for your system and click the Save settings button. Allowable values are 16 MB,
32 MB, 64 MB, 128 MB, 256 MB, and Automatic.
The
Automatic setting instructs the service processor to compute a value based on the total
amount of available physical memory installed on your system. (Even if your system is not
fully using the CoD portion of the installed memory, the calculation is based upon the total
amount of physical memory installed.)
Updates to the logical memory block size do not take effect until the next system reboot. For
most systems we recommend that this parameter be set to Automatic.
10.3.6 On demand utilities
Capacity on Demand (CoD) allows you to permanently activate inactive processors or
inactive system memory without requiring you to restart your server or interrupt your
business. You must first have sufficient inactive processor or inactive memory capacity
physically installed on your system. Then you will order and receive activation keys allowing
you to enable this capacity for your use.
Figure 10-79 shows the expanded On Demand Utilities menu. Using this menu, you can:
򐂰 Display CoD ordering information for your system (required for placing an order for adding
capacity).
򐂰 Enter CoD activation keys.
򐂰 Allow new processors or new memory to become allocated once CoD activation keys
have been entered.
򐂰 Enter special CoD commands that may be given to you by you hardware service provider.
Note: All System i5 systems require that some amount of system memory must be
allocated for the controlling Hypervisor. Selecting a larger MLB size may have an
effect on the amount of memory the system will require to be assigned to the
Hypervisor. This may slightly reduce the amount of memory remaining to be used
for system or LPAR assignment.