HP NetServer AA 4000 HP Netserver AA Solution Installation Guide v4.0 SP1 - Page 15

Device Redirection, Sample Endurance Hardware Configuration

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Tuple 1 CE IOP Tuple 2 CE MIC cable MIC cable IOP IL cable To the network Figure 1-1 Sample Endurance Hardware Configuration Device Redirection Because all I/O devices in the server physically reside on the IOPs, Endurance software redirects all I/O requests from the CEs to the IOPs. As a result, these I/O devices are logically associated with the CE. For example, the Endurance software can redirect a CD-ROM drive physically located in an IOP so that it is logically assigned to the CE (the CE has complete control of that CD-ROM drive). For mirrored disk devices and redundant Ethernet connections, the Endurance software coordinates all I/O processing so that these redundant components appear as a single logical device. For example, in a mirrored disk set, the two physical disks (one on each IOP) appear to the CE operating system and applications as one logical disk. If a disk failure occurs, the disk operations can transparently continue operating without affecting any server applications or clients. Preparing for the Installation 1-3

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Preparing for the Installation
1-3
Figure 1-1
Sample Endurance Hardware Configuration
Device Redirection
Because all I/O devices in the server physically reside on the IOPs, Endurance software
redirects all I/O requests from the CEs to the IOPs. As a result, these I/O devices are logically
associated with the CE. For example, the Endurance software can redirect a CD-ROM drive
physically located in an IOP so that it is logically assigned to the CE (the CE has complete
control of that CD-ROM drive).
For mirrored disk devices and redundant Ethernet connections, the Endurance software
coordinates all I/O processing so that these redundant components appear as a single logical
device. For example, in a mirrored disk set, the two physical disks (one on each IOP) appear to
the CE operating system and applications as one logical disk. If a disk failure occurs, the disk
operations can transparently continue operating without affecting any server applications or
clients.
IOP
CE
Tuple 2
To the network
IL cable
Tuple 1
IOP
CE
MIC cable
MIC cable