Intermixing Storage Expansion Enclosure Models; Drive-Side Mini-Hub Interface Ports - IBM TotalStorage DS4500 User Manual

Figure 19. Drive-side mini-hub interface ports
The maximum number of storage expansion enclosures that can be connected per
pair of redundant drive loops depends on the IBM DS4000 storage expansion
enclosure models used. The following DS4000 storage expansion enclosure types
are supported by the DS4500 Storage Server:
v FAStT EXP500
v DS4000 EXP700
v DS4000 EXP710
v DS4000 EXP100
If the drives are configured using only DS4000 EXP700, EXP710, or EXP100
storage expansion enclosures, the DS4500 Storage Server supports a maximum of
224 hard drives.
If the drives are configured using only FAStT EXP500 storage expansion
enclosures, the DS4500 Storage Server supports a maximum of 220 hard drives.
Attention: In order to attach DS4000 EXP100 or DS4000 EXP710 storage
expansion enclosures to a DS4500 Storage Server, the DS4500 Storage Server
controller firmware must be at version 06.xx.xx.xx or higher. In addition, you must
purchase the FC/SATA Enclosure Intermix premium option to combine DS4000
EXP100s with DS4000 EXP700s or DS4000 EXP710s in the same DS4500 Storage
Server configuration.
For detailed information about how to cable the storage server and storage
expansion enclosures, see the IBM TotalStorage DS4500 Fibre Channel Storage
Server Installation and Support Guide and the DS4500 Fibre Channel Cabling
Instructions that come with the storage server.

Intermixing storage expansion enclosure models

Storage expansion enclosure models can be mixed in the same redundant drive
loop or the same pair of redundant drive loops. As described in the following
sections, you can intermix FAStT EXP500s and DS4000 EXP700s, and you can
also intermix DS4000 EXP100s, EXP710s, and EXP700s.
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IBM TotalStorage DS4500 Fibre Channel Storage Server: User's Guide