HP PA 8800 - Manual (Page 31)

Power Redundancy Power Redundancy Power Redundancy Power Redundancy Superdome servers, by default, provide an additional power supply for N+1 protection. As a result, Superdome servers will
continue to operate in the event of a single power supply failure. The failed power supply can be replaced without taking
the system down.
Instant Capacity Instant Capacity Instant Capacity Instant Capacity (formerly
known as Instant Capacity on
Demand, iCOD) With HP's Instant Capacity solutions, Superdome servers can be populated with high performance PA-RISC CPUs. It is no
longer necessary to pay for the additional CPUs until the customer uses them, and additional CPUs can be activated
instantly with a simple command providing immediate increases in processing power to accommodate application traffic
demands.
In the unlikely event that a CPU fails, the HP system will replace the failed CPU on the cell board at no additional charge.
The Instant Capacity CPU brings the system back to full performance and capacity levels, reducing downtime and ensuring
no degradation in performance.
When additional capacity is required, additional CPUs on a cell board can be brought online. The Instant Capacity CPUs
are activated with a single command.
Instant Capacity on Demand (Instant Capacity) can be ordered pre-installed on Superdome servers.
The following applies to Instant Capacity on Superdome servers:
The number of Instant Capacity processors is selected per partition instead of per system at planning/order time.
Superdome PA-8600/PA-8700: At least one processor per cell in a partition must be a purchased processor.
Superdome PA-8800: At least 2 processors per cell in a partition must be purchased processors.
Processors are deallocated by Instant Capacity in such a way as to distribute deallocated processors evenly across the
cells in a partition. There is no way for a Customer Engineer (CE) or an Account Support Engineer (ASE) or a
customer to influence this distribution.
Reporting for the complex is done on a per partition basis. In other words, all partitions with Instant Capacity
processors must be capable of and configured for sending e-mail to HP.
Processors can be allocated and deallocated instantly or after a reboot at the discretion of the user.
Beginning with Instant Capacity Client Agent software version B.04.00 (September 2001), a license key must be
obtained prior to either activating or deactivating Instant Capacity processors. A free license key is issued once email
connectivity with HP has been successfully established from all partitions with Instant Capacity processors.
Superdome PA-8600/PA-8700 Superdome PA-8600/PA-8700 Superdome PA-8600/PA-8700 Superdome PA-8600/PA-8700
All cell boards within the Superdome server will be populated with four CPUs and the customer orders the number of CPUs
that must be activated prior to shipment.
Description Description Description Description Product Number Product Number Product Number Product Number
Right to use processor for PA 8600 552 MHz processor (no longer orderable) A6161A
Right to use processor for PA 8700 750 MHz processor A6441A
Right to use processor for PA 8700 875 MHz processor A6885A
Instant Capacity right to access PA-8700 (750-MHz or 875-MHz) processor A6162A
Instant Capacity Enable right-to-use PA 8600 552 MHz processor A6163A
Instant Capacity Enable right-to-use PA-8700 750-MHz processor A6442A
Instant Capacity Enable right-to-use PA-8700 875-MHz processor A6952A
Performance Considerations with Instant Capacity:
Going from one to two to three active CPUs on a cell board gives linear performance improvement
Going from three to four active CPUs gives linear performance improvement for most applications except some
technical applications that push the memory bus bandwidth.
Number of active CPUs per cell boards should be balanced across partitions. However, minor differences are okay.
(Example: Four active CPUs on one cell board and three active CPUs on the second cell board)
NOTE: NOTE: NOTE: NOTE: The Instant Capacity software will do CPU activation to minimize differences of number of active CPUs per
cell board within a partition.
Superdome PA-8800 Superdome PA-8800 Superdome PA-8800 Superdome PA-8800
Superdome PA-8800 offers both half populated and fully populated cell boards. A half-populated cell board on the
Superdome PA-8800 server will be populated with 4 PA-8800 processors. A fully populated cell board on the Superdome PA-
8800 server will be populated with 8 PA-8800 processors. However, inactive processors can be enabled/activated
QuickSpecs HP 9000 Superdome Servers HP 9000 Superdome Servers HP 9000 Superdome Servers HP 9000 Superdome Servers
(PA-8600, PA-8700 and PA-8800) (PA-8600, PA-8700 and PA-8800) (PA-8600, PA-8700 and PA-8800) (PA-8600, PA-8700 and PA-8800)
System Management Features
DA - 11721 North America — Version 13 — April 1, 2005 Page 31