HP NetServer AA 4000 HP AA HP Netserver 4000 Reference Guide - Page 11

The Logical Server

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Ch 1: Architecture Overview and Terminology place only through AA 4000 Management Tools or Utilities. The Logical Server Logical servers are created from an array of four separate servers. Computing is distinctly separate from the input/output (I/O) processing, and the array runs simultaneously on two symmetrical halves (or tuples), which, combined together, do not have a single point of failure. I/O processors run asynchronously, and the compute elements run synchronously in lockstep. Network Server Division Compute Elements Two of the NetServers take the roles of Compute Elements (CE's). Within the AA 4000 software the CEs are numbered CE1 and CE2. The CEs are two exactly identical NetServers including the same stepping code of the same processor type, and the same system memory sizes. All other components of the CEs are either disabled in the BIOS or removed from the system. There will be no use of any onboard SCSI or a SCSI HBA. There are no network cards, keyboard, mouse, or any other peripheral devices. The lone exception to this is the MIC. The MIC is the only I/O device in the CE. These characteristics of the CEs will result in two servers that can now perform processing in what is called "lockstep." With the CEs running in lockstep, together they are running one on copy of Windows NT Server. During a typical HPAA boot process, one CE will boot off of a system disk located in one of the servers functioning as an I/O Processor. The second CE will not boot from a disk, but instead, it synchronizes with the other CE. Once synchronization is complete, then the two CEs process in "lockstep" 1-5

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Ch 1: Architecture Overview and Terminology
Network Server Division
1-5
place only through AA 4000 Management Tools or
Utilities.
The Logical Server
Logical servers are created from an array of four separate servers.
Computing is distinctly separate from the input/output (I/O)
processing, and the array runs simultaneously on two symmetrical
halves (or tuples), which, combined together, do not have a single
point of failure. I/O processors run asynchronously, and the compute
elements run synchronously in lockstep.
Compute Elements
Two of the NetServers take the roles of Compute Elements (CE’s).
Within the AA 4000 software the CEs are numbered CE1 and CE2.
The CEs are two exactly identical NetServers including the same
stepping code of the same processor type, and the same system
memory sizes.
All other components of the CEs are either disabled
in the BIOS or removed from the system.
There will be no use of
any onboard SCSI or a SCSI HBA.
There are no network cards,
keyboard, mouse, or any other peripheral devices.
The lone
exception to this is the MIC.
The MIC is the only I/O device in the
CE.
These characteristics of the CEs will result in two servers that
can now perform processing in what is called “lockstep.”
With the CEs running in lockstep, together they are running one on
copy of Windows NT Server.
During a typical HPAA boot process,
one CE will boot off of a system disk located in one of the servers
functioning as an I/O Processor.
The second CE will not boot from a
disk, but instead, it synchronizes with the other CE.
Once
synchronization is complete, then the two CEs process in “lockstep”