System Design
1-8
Stratus ftServer 2600, 4500, and 6300 Systems: Operation and Maintenance Guide
(R639)
Description of System Components
This section describes the major CRUs and ports of an ftServer 2600, 4500, or 6300
system. See Chapter 3 for a description of the LEDs and buttons on the front of the
enclosure.
CPU-I/O Enclosures
An ftServer 2600, 4500, or 6300 system consists of two enclosures. Depending on the
system model and option chosen, each enclosure contains either one or two
processors.
CPU-I/O Enclosure Fan Assembly
Each CPU-I/O enclosure is cooled by an assembly of four fans. The assembly is a
CRU.
DIMMs
Each CPU-I/O enclosure supports up to 12 four- or eight-gigabyte (GB)
customer-replaceable DIMMs, for a maximum memory capacity of 96 GB per
enclosure. Single-processor systems support a maximum of 6 DIMMs per enclosure.
Dual-processor systems support a maximum of 24 DIMMs per system.
Single-processor systems support a maximum of 12 DIMMs per system.
Internal Hard Disk Drives
Each enclosure supports up to eight SAS 2.5-inch hot-pluggable hard disk drives that
are available in models of 73-, 146-, or 500-GB capacity. Slots not occupied by a disk
drive must be closed with a disk-drive blank.
Front Panel and DVD Drive
Each system includes one front panel unit that contains a USB 2.0 DVD drive, a system
power button, system status LEDs, and a USB 2.0 port.
NMI Button
Pressing the nonmaskable interrupt (NMI) button on the primary CPU- I ⁄ Oenclosure
for four to eight seconds shuts down the system and generates a crash dump file. See
“Using the NMI Button to Create a Dump File” on page 3-21 for more information.
System Backplane
The system backplane assembly connects the two CPU- I ⁄ O enclosures to each other.
It also houses three USB ports, two serial communications ports, the VGA port, and the
socket for the modem assembly.
Modem
The modem, which attaches to the system backplane, provides bidirectional
communication with the Stratus ActiveService Network (ASN). The modem is not
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