Storage Unit; Features - IBM TotalStorage 300 Service Manual

RS-232 port

Storage Unit

The IBM NAS 300 storage unit is a compact unit that provides high-capacity, Fibre
Channel (FC) disk storage. It delivers fast, high-volume data transfer, retrieval, and
storage functions across multiple drives, to multiple hosts. The expansion enclosure
is designed for continuous, reliable service; the modular, redundant disk drives,
power supplies, ESM boards, and fans use hot-swap technology for easy
replacement without shutting down the system.
The storage unit supports redundant, dual-loop configurations. Optional external FC
cables and gigabit interface converters (GBICs) connect the RAID controller to the
storage unit.
By adding an additional RAID storage controller, you can add up to seven 10–drive
storage units to your IBM NAS 300.

Features

Each storage unit includes the following standard features:
v Dual ESM boards: The environmental services monitor (ESM) boards contain the
v 10 Fibre Channel 40–pin disk drives.
v Dual power supplies and dual modular cooling fan assemblies.
Table 2. storage unit features
General
v Modular components:
– High-capacity disk drives
– Environmental services monitor
(ESM) boards
– Power supplies
– Cooling fans
v Technology:
– Supports disk arrays
– Supports clustering
– Fibre Channel host interface
– Redundant data storage,
cooling system, power system,
and ESM boards
– Hot-swap technology for drives,
power supplies, fans, and ESM
boards
v User interface:
– Built-in power, activity, and fault
indicators
– Identification labeling CRUs,
rear indicator lights, switches,
and connectors
– Easy-to-replace drives, power
supplies, ESM boards, and fans
The RS-232 port is a TJ-6 modular jack and is used for an RS-232 serial
connection. The RS-232 port is used by service personnel to perform
diagnostic operations on the RAID controllers. An RS-232 cable comes with
the RAID storage controller.
expansion unit controls, switches, and LEDs. Each ESM board has two GBIC
ports for connecting the storage unit to the RAID storage controller.
Disk drive storage
Maximum drives per storage unit:
10
ESM boards
v Technology and interfaces:
– Fibre Channel: 40-pin FC disk
drives
– Fibre Channel interface: Four,
GBICs connectors for incoming
and outgoing FC cables (two
GBICs on each ESM board)
Chapter 2. Introduction
9