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Partitioning

A hardware partition corresponds roughly to a single, standalone system. The HP 9000 rp8440

Server can be subdivided into four partitions, each containing one or more cells that

communicates coherently over a high bandwidth, low latency crossbar fabric. Special

programmable hardware in the cells defines the boundaries of a partition in such a way that the

isolation is enforced from the actions of other partitions. Each partition runs its own independent

instance of the operating system (HP UX 11i v1, v2 and v3). Applications cannot span partitions

since each partition runs its own instance of the OS, essentially functioning as a stand alone

server. However, different partitions may be executing the same or different revisions of an

operating system, or they may be executing different operating systems, with OS availability.

Each partition has its own independent processors, memory and I/O resources consisting of the

resources of the cells that make up the partition. Resources may be removed from one partition

and added to another without having to physically manipulate the hardware just by using

commands that are part of the System Management interface. With future releases of HP UX and

Windows, using the related capabilities of dynamic reconfiguration (e.g. on line addition, on line

removal), new resources may be added to a partition and failed modules may be removed and

replaced while the partition continues in operation.

Partitioning the resources of the complex in this way makes it easy to run multiple applications on

the same physical system; you can allocate physical resources and tune the operating system

running on each partition depending on the needs of the application (or the most important

application) you intend to run on it. Alternatively, you can configure the HP 9000 rp8440 Server as

a single partition, allowing all the resources to be focused on a single set of tasks, for example a

large online transaction processing application.

You can increase or reduce the processing power of a partition by adding or deleting cells. With

the rp8440, you must shut down the operating system running on the affected partition(s) before

moving cells, and before making configuration changes that will take effect. Though the OS may

include commands for some configuration tasks, HP recommends you use the Partition Manager

(parmgr) to configure partitions.

Hardware based partition configuration changes may require a reboot of the partition depending

upon the configuration change. The reboot of the partition only affects the partition that is being

reconfigured. The other partitions defined in the chassis are not affected and will continue to

execute without interruption. In a future HP UX release, dynamic hard partitions will be supported.

Dynamic partitions imply that partition configuration changes do not require a reboot of the

partition.

The HP 9000 rp8440 Server can be divided into four independent hardware partitions when

configured with the HP Server Expansion Unit 2. In a partitioned configuration, I/O bay resources

such as I/O slots, core I/O, disk and removable media bays, are always dedicated to the

corresponding cell board slot. In other words, I/O bay 0 resources are always configured to the

cell board in Cell slot 0. Therefore, in a partitioned system, the amount of resources within a

partition is always proportional to the number of cells within that partition. There is no flexibility to

otherwise divide these components. For example, in a system configured with two cells in

separate nPars, it is not possible to include twelve I/O slots in partition 0 and four I/O slots in

partition 1. Please refer to the "HP Server Expansion Unit 2" section in this guide or more specific

details.

The table below summarizes the resource availability based on hardware partitions.

QuickSpecs

HP 9000 rp8440 Server

Configuration

DA - 12697 U.S. QuickSpecs — Version 4 — 3/3/2008

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QuickSpecs 1

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