Hardware Description Of The Hp Xp24000/Xp20000 Disk Array; Xp24000 System Architecture - HP StorageWorks XP20000/XP24000 - Disk Array Owner's Manual

Hp storageworks xp24000/xp20000 disk array owners guide (ae131-96072, december 2009)

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2 Hardware description of the HP

XP24000/XP20000 Disk Array

The HP StorageWorks XP series of disk arrays are high-performance RAID-capable disk array systems

used to store large quantities of data in an efficient and secure manner.

There are no single points of failure in the disk arrays. They include redundant logic assemblies,

controllers, power supplies, and dual-ported RAID disk drives, all of which can be removed or replaced

without interrupting access to data. This chapter describes the physical components of the disk array.

CAUTION:

Only your HP support representative can remove or replace hardware.

Figure 2

shows, the basic XP24000 disk array consists of a DKC cabinet containing two main

sections: a logic box and an HDD box.

The logic box includes channel adapters (CHA) that provide server and other interfaces, disk adapters

(DKA) for controlling disk drives, cache memory adapters (CMA), and shared memory adapters

(SMA).

The HDD box contains the disk drives and a Fibre switch that interfaces the drives to the DKAs.

Additional disk drives can be added by installing up to four optional DKU cabinets containing multiple

additional HDD boxes.

Components interact by way of the data paths shown in the figure.

Also included but not shown in

Figure 2

are the AC-DC power supplies and backup batteries.

XP24000/XP20000 Disk Array Owner's Guide

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