IBM DS8700, Введение и руководство по планированию

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Device adapters are ordered and installed in pairs. A device adapter pair supports
two independent paths to all of the disk drives served by the pair. The two paths
connect to two different network fabrics to provide fault tolerance and to help
ensure availability. The physical links allow two read operations and two write
operations to be performed simultaneously around the fabric.
Feature codes for device adapters
These feature codes are for the device adapters of your storage unit.
Each device adapter feature includes a pair of device adapters. Table 21 shows the
feature codes to use and the applicable models for each feature code.
Table 21. Device adapter feature codes
Feature code Device adapter types Models
3043 Device adapter pair 941 and 94E
3053 Device adapter pair I 951 and 95E
Disk drive cables
You must order at least one disk cable set to connect the disk drives to the device
adapters.
The disk drive cable feature provides you with a complete set of Fibre Channel
cables to connect all the disk drives that are supported by the model to their
appropriate device adapters.
Disk drive cable groups have the following configuration guidelines:
v
The minimum number of disk drive cable group features for each model is one.
v
The disk drive cable groups must be ordered as follows:
– If the disk drives connect to device adapters within the same base model,
order disk drive cable group 1.
– If the disk drives connect to device adapters within the same expansion
model, order disk drive cable group 2.
– If the disk drives are in a second expansion model (position 2 expansion
model), order disk drive cable group 4.
– If the disk drives are in a third expansion model, order disk drive cable group
5.
Feature codes for disk drive cables
Use the disk drive cable feature codes to order the cable groups for each DS8800
model.
Table 22 shows the feature codes to use and the connection type that is supported
by each group.
Table 22. Disk drive cable feature codes
Feature
Code Disk Drive Cable
Group Connection Type
1211 Disk drive cable group
1 Connects the disk drives to the device adapters within
the same base model. Used for Model 941.
100
Introduction and Planning Guide