Maximum Number Of Storage Expansion Enclosures - IBM DS4800 User, Installation And Maintenance Manual

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Figure 2. Location of components in the storage subsystem
The storage subsystem provides flexibility in configuring a RAID array. (The
DS4800 disk capacity is scalable from 36 GB to over 89 TB.) A minimal storage
subsystem configuration would consist of one DS4800 and one DS4000 storage
expansion enclosure. The storage expansion enclosure can contain as few as two
disk drives. The maximum number of disk drives a DS4800 can support is 224
drives. The maximum number of storage expansion enclosures that can be
attached to the DS4800 varies depending on the type of the attached DS4000
storage expansion enclosures and whether there is a mix of different types of
DS4000 storage expansion enclosures. Currently, the DS4800 storage subsystem
models 82A/H, 84A/H and 88A/H support the following DS4000 storage expansion
enclosures:
v EXP100
v EXP710
v EXP810
The DS4800 storage subsystem models 80A/H support only the following DS4000
storage expansion enclosures:
v EXP710
v EXP810
See Table 3 for the maximum number of storage expansion enclosures that can be
attached to the DS4800 storage subsystem by storage expansion enclosure type.
Table 3. Maximum number of storage expansion enclosures
Enclosure type
EXP100
EXP710
EXP710 and EXP100
EXP810
RAID controllers
Maximum number of
enclosures in a redundant
DS4800 drive channel pair
8
8
8
7
Maximum number of
enclosures in a DS4800
subsystem
16
16
16
14
Chapter 1. Introduction
9