Compaq AlphaServer ES40 Manuale Utente Scaricare il pdf (Pagina 13)

Installation and Maintenance

The systems are designed for easy hardware, software, and

option installation. Options ordered with a system are

preinstalled and tested at the factory. The operating systems

are also installed at the factory.

Additional CPUs, memory, power supplies, and disks can be

added to the tower and pedestal systems by anyone with

appropriate technical training and experience. Installation of

components in a rackmount system is reserved for service

providers and self-maintenance customers.

Clustering

A cluster is a loosely coupled set of systems that behaves (is

addressed and managed) like a single system, but provides

high levels of availability through redundant CPUs, storage,

and data paths. Clusters are also highly scalable; that is, CPU,

I/O, storage, and application resources can be added

incrementally to efficiently increase capacity. For customers,

this translates to reliable access to system resources and data,

and investment protection of both hardware and software.

Clustering allows multiple computer systems to communicate

over a common interface, share disks, and spread the

computing load across multiple CPUs. Clustering is imple-

mented using our traditional interconnects and using the

newest technology.

PCI to Memory Channel Interconnect

Under Tru64 UNIX and OpenVMS, you can build high-avail-

ability clusters using the PCI to Memory Channel interconnect.

The Memory Channel interconnect is a high-bandwidth, low-

latency PCI-based communications interconnect for up to eight

AlphaServer systems. Data written to one computer’s memory

is shared by other computers on the

Memory Channel bus.

The PCI adapter is the interface between a PCI and a Memory

Channel bus. This bus is a memory-to-memory computer

system interconnect that permits I/O space writes in one

computing node to be replicated into the memories of all other

nodes on the Memory Channel bus. A write performed by any

CPU to its reflected address region results in automatic

hardware updates to memory regions in other nodes. One

node’s write is “reflected” to other nodes as a direct side effect

of the local write. This provides a memory region with

properties similar to a high-performance shared memory

across a group of nodes.

Operating System Support

For clustered UNIX systems, TruCluster Software solutions

allow users access to network services and provide further

failover recovery from server, network, or I/O failures. UNIX

cluster systems use the SCSI bus and/or PCI to Memory

Channel interconnect bus between disks and systems.

OpenVMS cluster systems use the CI, SCSI, Ethernet, FDDI,

and Memory Channel as the interconnect between disks and

systems.

Windows NT cluster systems use SCSI buses and Ethernet.

The primary means of clustering AlphaServer ES40 systems

depends on the operating system.

•

CI clusters, OpenVMS only

•

Memory Channel, Tru64 UNIX and OpenVMS

•

SCSI clusters, Tru64 UNIX, OpenVMS, and Windows

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Compaq AlphaServer ES40 Manuale Utente Pagina 13

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