IBM XIV 硬件组件说明

Hardware components

IBM® XIV® Storage System configuration includes data modules, interface modules, Ethernet switches, and uninterruptible power supply units.

The following figures show the IBM XIV Storage System major hardware components as they are seen from front and back.Figure 1. Fully populated XIV system model 281x-A14 rack

Interface modules

Each contains 12 disk drive modules (DDMs), CPU, Cache and Host Interface adaptors.

Host Interface adaptor

Each interface module provides Fibre Channel ports. Some host interface modules also provide iSCSI ports. Hosts may attach to the system by using the Fibre Channel and iSCSI ports. (See the most current version of the XIV interoperability matrix on the System Storage® Interoperation Center website for specific supported configurations.)

SATA disk drives and cache memory

memory. SATA disk drives are used as the non-volatile memory for storing data in the storage grid and cache memory is used for caching data previously read, prefetching of data from a disk, and for delayed destaging of previously written data.

Data modules

Each data module contains 12 SATA disk drives and cache memory. SATA disk drives are used as the nonvolatile memory for storing data in the storage grid and cache memory is used for caching data previously read, prefetching of data from a disk, and for delayed destaging of previously written data.

Uninterruptible power supply module complex

The uninterruptible power supply module complex consists of three uninterruptible power supplies. It maintains an internal power supply in the event of a temporary failure of the external power supply. In the case of a continuous external power failure, the uninterruptible power supply module complex maintains power long enough for a safe and ordered shutdown of the IBM XIV Storage System. The IBM XIV Storage System can sustain the failure of one uninterruptible power supply unit while protecting against external power failures.

Ethernet switch RPS

A redundant power source for the Ethernet switches.

Maintenance Module

Allows remote support access using a modem.

ATS

The Automatic Transfer Switch (ATS) switches between line cords in order to allow redundancy of external power.

Modem

Allows the system to receive a connection for remote access by IBM support. The modem connects to the maintenance module.

Ethernet switches

Provide redundant internal GB Ethernet networks. All the modules in the system are linked through an internal redundant Gigabit Ethernet network. The network is composed of two independent Ethernet switches. Each module is directly attached to both switches, and the switches are also linked to each other. Because the switches are configured in an active-active configuration, the network topology uses maximum bandwidth while being tolerant to any individual failure in a network component (port, link, or switch).

Hardware connectivity

Data and interface modules are generically referred to as "modules." Modules communicate with each other by means of the internal Gigabit Ethernet network. Each module contains redundant Gigabit Ethernet ports used for module to module communication. The ports are all linked to the internal network through the redundant Ethernet switches. In addition, for monitoring purposes, the uninterruptible power supplies are directly connected by Ethernet and USB to individual modules.