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Chapter 9. Configuration planning 181
A Standby CoD disk set contains 16 disk drives of the same capacity and RPM (10000 or
15000 RPM). With this offering, up to four Standby CoD disk drive sets (64 disk drives) can
be factory or field installed into your system.
To activate, you logically configure the disk drives for use. This is a non-disruptive activity that
does not require intervention from IBM. Upon activation of any portion of the Standby CoD
disk drive set, you must place an order with IBM to initiate billing for the activated set. At that
time, you can also order replacement Standby CoD disk drive sets.
For more details, refer to the
IBM TotalStorage DS8000 Introduction and Planning Guide,
GC35-0495.
9.4.5 Capacity and well-balanced configuration
The DDMs are installed in the DS8000 according to a rule of installation sequence of disk
enclosures. Sometimes, the installation rule is related to the arrangement of your data. The
installation rule is defined as follows:
Each disk enclosure can contain 16 DDMs or dummy carriers, and a pair of disk
enclosures (32 DDMs) is installed in the DS8000 at the same time.
Each disk enclosure is connected to a specific DA pair, and two disk enclosure pairs (64
DDMs) are connected to a DA pair sequentially.
For example, if you install 96 DDMs in a DS8000, the first two disk enclosure pairs (64 DDMs)
are connected to the DA pair 0, and next one disk enclosure pair (32 DDM) is connected to
the DA pair 1.
The following figures illustrate the installation rule of the disk enclosures.
Figure 9-13 on page 182 shows a DS8100 Model 921 (2-way model).