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drive expansion unit types are the IBM FAStT EXP500 and the IBM FAStT EXP700.
You can mix the drive expansion unit models in the same storage server or the
same pair of drive loops. However, the maximum Fibre Channel transfer speed in
the storage server drive mini hubs and the IBM FAStT EXP700 Environmental Card
units must be set at 1Gbps because the maximum FC transfer speed of the IBM
FAStT EXP500 drive expansion units is 1Gbps. See Table 4 for the possible
combinations of EXP500 and EXP700 drive expansion units per drive loop. See
Figure 19 on page 14 for a graphical depiction of the drive-side mini-hub interface
ports.
A fully configured FAStT900 Storage Server supports a maximum of 16 IBM FAStT
EXP700 drive expansion units (8 drive expansion units per drive-loop pair), or 224
drives using dual pair of redundant drive loops.
Table 4. Possible combinations of EXP500 and EXP700 drive expansion units per drive loop
# of EXP500 units
# of EXP700 units
0
8
1
7
2
6
3
6
4
5
5
4
6
3
7
3
8
2
9
1
10
0
11
0
Important: These large configurations are for capacity purposes and might not
provide the best performance. FAStT900 Storage Servers use only redundant
drive-loop configurations.
Total Expansion
Total number of
units
drives
8
112
8
108
8
104
9
114
9
110
9
106
9
102
10
112
10
108
10
104
10
100
11
110
Chapter 1. Introduction
13
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