Fujitsu Siemens Computers SX series User Manual page 289

Dynamic Reconfiguration
CoD (Capacity on Demand)
Capacity on Demand (CoD) makes additional CPU power available when required in the
context of purchased licenses.
This is possible on the one hand when there are extra CoD-CPUs installed on the XSBs
used by the partition in addition to the CPUs purchased. On the other hand, from the SX150
model series on additional XSBs can be added dynamically to the partition and their CPUs
used for CoD.
The CoD-CPUs are then attached during live operations (explicitly) when there is an
increased performance requirement and are detached (explicitly) once the workload peak
has passed.
Comments
– The CoD-CPUs in the BS2000 environment are also referred to as "extra" CPUs.
– A CoD-CPU also functions as a "cold spare" CPU, i.e. after a CPU has failed and a
reboot has taken place, this CPU replaces a "normal" CPU.
!
Online maintenance of the hardware after a fault occurs
After a component or the entire XSB has failed, a Solaris reboot takes place in the partition
involved and the faulty XSB is not put into operation again.
As of the SX150 model series, the automatic recovery function selects as the boot XSB an
XSB located on a different system board from the one affected by the failure. On the XSBs
which are located on the system board to be repaired, only the CPUs are put into operation.
In the context of online maintenance these XSBs are removed using DR methods
(DR-disconnect). It may also be necessary to remove other XSBs from other partitions which
are located on the same system board from these partitions (using DR or a reboot).
The system board can then be removed. It can be replaced or reinstalled after it has been
repaired.
U41272-J-Z385-3-76
Important note
The "extra" CPUs must be released explicitly before DR-disconnect takes place for a
CoD-XSB:
– In the case of native BS2000 with
/DETACH-DEVICE UNIT=*EXTRA-CPU(*ALL)
– In the case of VM2000 with
/DETACH-VM-RESOURCE UNIT=*EXTRA-CPU(*ALL)
Otherwise BS2000 rejects the DR request with the console message ETMDR05 or
VM2000 does this with the message VMS4555.
Functional scope, concepts and applications
289