IBM DS8700, Introduction And Planning Manual

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Table 20. Feature codes for IBM Full Disk Encryption Standby CoD disk drive sets (16 disk
drives per set) (continued)
Feature Code Size and description (see
Notes) Disk speed in
RPM (K = 1000) Models
Notes:
1. A regular disk drive set feature and a Standby CoD disk drive set feature can be
installed on the same storage unit by using the following rules:
v
If a regular disk drive set feature and a Standby CoD disk drive set feature are
contained within the same disk enclosure feature, they must be the same capacity.
The speed can differ.
v The maximum number of Standby CoD disk drive set features that you can have on
a 941 or 94E storage unit is four.
v
The maximum number of Standby CoD disk drive set features that you can have on
a 951 or 95E storage unit is six.
v You must balance the number of Standby CoD disk drive set features on the storage
unit with regular disk drive set features. Use the following rules:
– You must have twice as many regular disk drive set features installed in the 941
and 94E storage units as there are Standby CoD disk drive set features. For
example, if you order two Standby CoD disk drive set features (32 drives) for a
941 or 94E storage unit, you must have at least four regular disk drive features (64
drives) on the storage unit.
– You must have three times as many regular disk drive set features installed in the
951 and 95E storage units as there are Standby CoD disk drive set features. For
example, if you order two Standby CoD disk drive set features (32 drives) for a
951 or 95E storage unit, you must have at least six regular disk drive features (96
drives) on the storage unit.
2. An intermix of encryption and nonencryption disk drives is not supported.
Disk enclosure fillers
Disk enclosure fillers fill empty disk drive slots in disk enclosures.
One disk enclosure filler feature provides a set of 16 disk enclosure fillers and
assists in maintaining a proper temperature for the storage enclosure. It is required
that you order two filler features if only one disk drive set feature is in the
expansion enclosure pair. One filler feature is required if two disk drive set
features are in the expansion enclosure pair.
Feature codes for disk enclosure fillers
Use the disk enclosure filler feature code to order filler sets for the disk enclosure
when you have one or two regular or standby CoD features in the enclosure.
A disk enclosure filler set includes 16 fillers (8 fillers for 3.5" disk enclosure filler
set). The following feature codes can be used on all models.
2997 3.5" Disk enclosure filler set
2998 Disk enclosure half-filler set
2999 Disk enclosure filler set
Device adapters
Device adapters provide the connection between storage devices and the storage
facility images through I/O ports.
Chapter 4. Storage unit physical configuration
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