Introduction
1–5
Hitachi VSP User and Reference Guide
Drive Chassis
A VSP storage system can contain up to three types of data drives. Each
type of drive is mounted in a chassis that holds only that type of drive. Drive
types cannot be intermixed within the same drive chassis.
The HDD/SSD drive chassis (factory designation DKU) contains either disk
(HDD) drives or flash (SSD) drives, eight SAS switches, and two 8-fan
“door” assemblies that can be easily opened to allow access to the drives.
There are two types of DKU drive chassis. One type can contain up to 80 3-
1/2 inch HDD disk drives or SSD flash drives. The second type can contain
up to 128 2-1/2 inch HDD disk drives or SSD flash drives.
The maximum number of 3-1/2-inch drives in a Virtual Storage Platform is
1280. The maximum number of 2-1/2 drives is 2048. The maximum
number of Flash Module drives is 96. Details are located in System
Components on page 3-1.
Flash chassis
In addition to the chassis for disk and/or flash drives, a second type of
chassis can be installed in a VSP system. A flash chassis (factory
designation FBX) is a cluster of four flash boxes (trays), as shown in the
following illustration. Each flash box contains up to 12 flash modules
(factory designation FMD). A flash chassis contains up to four flash boxes
and 48 flash modules.
Figure 1-3 Drive chassis
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