Sun Microsystems manual Sun Enterprise 220R Server Owner’s Guide October

System main memory is provided by up to 16 dual in-line memory modules (DIMMs), each of which is capable of storing 32, 64, or 128 Mbytes of data. Total main memory is expandable up to 2 Gbytes. To enhance memory I/O performance, the system transfers 64 bytes of data into or from memory on each memory transfer. For more information about system memory, see “About Memory” on page 66.

System I/O is handled by two separate Peripheral Component Interconnect (PCI) buses. These industry-standard buses support all main logic board I/O and up to four PCI interface cards. One PCI bus operates at a 33-MHz clock rate and supports up to three PCI cards, while the other bus can operate at either 33-MHz or 66-MHz and supports one PCI card. All PCI cards plug in to slots provided on the system’s main logic board. For more information about PCI buses, see “About Peripheral Component Interconnect (PCI) Buses” on page 68.

Internal disk storage is provided by up to two 1-inch high, 3.5-inch wide

(2.54-cm x 8.89-cm), Ultra-Small Computer System Interface (UltraSCSI) disk drives. Both drives are supported on the same channel with a 40-Mbyte per second wide UltraSCSI interface provided direct to the system’s main logic board. Systems configured with two disk drives can provide software mirroring and full hot- pluggable boot drive capability. For more information about disk storage, see “About Internal Disk Drives” on page 74.

External multi-disk storage subsystems and Redundant Arrays of Inexpensive Disks (RAID) storage arrays can be supported by installing single-channel or multi- channel PCI host adapter cards along with the appropriate system software. Software drivers supporting UltraSCSI, and other types of devices, are included in the Solaris operating environment. For more information about RAID storage support, see “About Internal Disk Drives” on page 74.

A5.25-inch by 1.6-inch (13.35-cm x 4.06-cm) CD-ROM drive is standard, or a 1.0-inch (2.54-cm) tape drive is optional, on the Sun Enterprise 220R server and is installed in the upper bay of the removable media assembly (RMA). The CD-ROM drive has multimedia features, which include multi-session capability and fast access for image and video data.

Up to four external tape devices can be attached to the standard 68-pin 40-Mbyte per second UltraSCSI port provided on the system’s back panel. Additional external tape devices can be supported with appropriate PCI host adapter cards.

You can easily connect the Sun Enterprise 220R server to either a 10-Mbps or a

100-Mbps Ethernet by means of an auto-sensing Ethernet interface provided on the system’s main logic board. In addition, the standard Media Independent Interface (MII) port permits easy connection to a variety of external Ethernet transceivers. Ethernet interfaces or connections to other networks, such as Fiber Distributed Data Interface (FDDI), Asynchronous Transfer Mode (ATM), or token ring, can be provided by installing the appropriate PCI interface cards. For more information, see “Administration and Network Setup” on page 45.

2 Sun Enterprise 220R Server Owner’s Guide • October 1999