User guide

Introduction 1–3
Hitachi Unified Storage VM Block Module Hardware User Guide
Controller chassis
The c 5U high controller chassis contains six types of pluggable modules as
shown and described in the following illustrations and tables. The controller
provides system logic and control, memory, and monitoring, as well as the
interfaces and connections to disk drives and host servers.
The following illustrations show 3D views of the front and rear of a controller
chassis. It is described in detail on the following pages.
Figure 1-1: HUS VM example storage system
Item Description Item Description
1 Blank space for installation lifter (2U) 2 Controller chassis (CBX)
3 DBX (dense) drive box (up to 48 LFF
drives)
4 One of the following drives:
• DBS drive box (up to 24 SFF drives each)
• DBL drive box (up to 12 LFF drives each)
• DBF drive box (up to 12 FMD drives each)
5Blank space (1U)