IBM TotalStorage DS4400, User Manual

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The maximum Fibre Channel transfer speed in all the DS4400 Storage Server
drive-side mini-hubs must be set to 1 Gbps.
Attention: If you change the DS4000 EXP700 storage expansion enclosure or
DS4400 Storage Server enclosure link speed setting, you must power-cycle the
storage server. See “Turning off the power” on page 25 and “Turning on the
power” on page 24 for the proper DS4000 configuration power-down and
power-up sequences. For more information, see the IBM TotalStorage DS4000
Hard Drive and Storage Expansion Enclosure Installation and Migration Guide .
If you intermix FAStT EXP500s and DS4000 EXP700s within a single drive loop,
see Table 8 for the possible combinations of FAStT EXP500 and DS4000 EXP700
storage expansion enclosures per drive loop.
Table 8. Possible combinations of FAStT EXP500 and DS4000 EXP700 storage expansion
enclosures per drive loop
Number of FAStT
EXP500 units
Number of DS4000
EXP700 units
Total number of
storage expansion
enclosures
Total number of
drives
0 8 8 112
1 7 8 108
2 6 8 104
3 6 9 114
4 5 9 110
5 4 9 106
6 3 9 102
7 3 10 112
8 2 10 108
9 1 10 104
10 0 10 100
11 0 11 110
Important: These large configurations are for capacity purposes and might not
provide the best performance.
For full details on the requirements for intermixing FAStT EXP500 and DS4000
EXP700 storage expansion enclosures, refer to the IBM TotalStorage DS4000
EXP700 and EXP710 Storage Expansion Enclosures Installation, User’s, and
Maintenance Guide . You can also refer to the IBM TotalStorage DS4000 Hard Drive
and Storage Expansion Enclosure Installation and Migration Guide .
Intermixing DS4000 EXP710s and DS4000 EXP700s: You can intermix DS4000
EXP710s and DS4000 EXP700s in the same drive loop with a DS4400 Storage
Server, but all DS4000 EXP710s must be grouped together.
Important
The requirements for intermixing DS4000 EXP710s and EXP700s state that
you must group like enclosure types together, regardless of what the type is.
Chapter 1. Introduction
17