Drive interface ports
DS4500 Storage Subsystems use only redundant
Drive loop C and D for redundant loop 2
Drive loop A and B |
|
|
|
|
for redundant loop 1 | 4 | 3 | 2 | 1 |
|
2 Gb/s | 2 Gb/s | 2 Gb/s | 2 Gb/s |
1 Gb/s | 1 Gb/s | 1 Gb/s | 1 Gb/s |
! | ! | ! | ! |
OUT | OUT | OUT | OUT |
IN | IN | IN | IN |
2 Gb/s
1 Gb/s
!
OUT
IN
2 Gb/s | 2 Gb/s | 2 Gb/s |
1 Gb/s | 1 Gb/s | 1 Gb/s |
! | ! | ! |
OUT | OUT | OUT |
IN | IN | IN |
Drive
Use one port on each mini hub to connect a drive loop cable
Figure 4. Drive mini-hub ports
Leave one port unoccupied for future upgrades
d3nu4024
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 Subsystem:
vFAStT EXP500
vDS4000 EXP700
vDS4000 EXP710
vDS4000 EXP100
If the drives are configured using only DS4000 EXP700, EXP710, or EXP100 storage expansion enclosures, the DS4500 Storage Subsystem supports a maximum of 224 hard drives.
If the drives are configured using only FAStT EXP500 storage expansion enclosures, the DS4500 Storage Subsystem supports a maximum of 220 hard drives.
Attention: In order to attach DS4000 EXP100 or DS4000 EXP710 storage expansion enclosures to a DS4500 Storage Subsystem, the DS4500 Storage Subsystem 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 Subsystem configuration.
Refer to the IBM TotalStorage DS4000 Hard Drive and Storage Expansion Enclosure Installation and Migration Guide for complete information on storage expansion enclosure support and intermixing requirements for the DS4500 Storage Subsystem.
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