Maximum and minimum configurations
Table 31 and Table 32 provide the minimum and maximum numbers of host
adapter features that the Model 941 and Model 951 storage unit configuration can
contain.
Table 31. Model 941 minimum and maximum host adapter features
Storage Unit
Type
Storage Unit
Configuration
Minimum Number
of Host Adapter
Features for the
Base Model
(See Note 1)
Maximum Number
of Host Adapter
Features for the
Storage Unit
(See Note 1 and 2)
941 (2-way) Base model
(stand-alone)
216
941 (4-way) Base model
(stand-alone)
216
Base model
+ 1 expansion model
232
Base model
+2ormore
expansion models
232
Notes:
1. The minimum number of host adapters applies only to the base model within the
storage unit. Expansion models have no minimum requirement. The maximum number
applies to the entire storage system.
2. The maximum number of host adapters for any one model cannot exceed 8 with 8
Gbps adapters (or 16 with 4 Gbps adapters). You can add host adapters to the base
model in a 941 storage unit and expansion model 94E.
Table 32. Model 951 minimum and maximum host adapter features
Storage Unit
Type
Storage Unit
Configuration
Minimum Number
of Host Adapter
Features for the
Base Model
Maximum Number
of Host Adapter
Features for the
Storage Unit
(See Note)
951 (2-way) Base model
(stand-alone)
24
951 (2-way)
Business class
Base model
(stand-alone)
24
951 (4-way) Base model
(stand-alone)
28
Base model
+ 1-3 expansion models
216
Note: The maximum number of host adapters for any one model cannot exceed 8 with 8
Gbps host adapters. You can add host adapters only to the base model in a 951 storage
unit and the first expansion model, 95E.
Configuring for highest availability
After you have met the initial minimum order requirement, you can order one host
adapter at a time. However, to ensure the highest availability of your data, always
add host adapters (of the same type) in pairs.
112 Introduction and Planning Guide
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