Memory Interleaving; Independent Memory Subsystems; Ultra-4 Scsi Controller; Ultra-4 Scsi Backplane - Sun Microsystems Netra 440 Product Overview

Memory Interleaving

You can maximize the system's memory bandwidth by taking advantage of its
memory interleaving capabilities. The Netra 440 server supports two-way
interleaving. In most cases, higher interleaving results in improved system
performance. However, actual performance results can vary depending on the
system application. Two-way interleaving occurs automatically in any DIMM group
where the DIMM capacities do not match the capacities used in any other group. For
optimum performance, install identical DIMMs in all four slots of a CPU/memory
module.

Independent Memory Subsystems

Each Netra 440 server CPU/memory module contains an independent memory
subsystem. Memory controller logic incorporated into the UltraSPARC IIIi CPU
allows each CPU to control its own memory subsystem.
The Netra 440 server uses a shared memory architecture. During normal system
operations, the total system memory is shared by all CPUs in the system.

Ultra-4 SCSI Controller

The Netra 440 server uses an intelligent, two-channel 320-Mbyte per second Ultra-4
SCSI controller. Integrated into the motherboard, the controller resides on PCI Bus
2B and supports a 64-bit, 66-MHz PCI interface.
The on-board Ultra-4 SCSI controller provides hardware RAID mirroring (RAID 1)
capability with higher performance than conventional software RAID mirroring.
One pair of hard drives can be mirrored using the on-board Ultra-4 SCSI controller.
For more information about RAID configurations and configuring hardware
mirroring using the Ultra-4 SCSI controller, refer to the Netra 440 Server System
Administration Guide (817-3884-xx).

Ultra-4 SCSI Backplane

The Netra 440 server includes a single Ultra-4 SCSI backplane with connections for
up to four internal hard drives, all of which are hot-swappable.
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