Disk Drive Module (Ddm) Storage Features; Capacity Calculation Guidelines; Fibre-Channel Disk Drive Sets For Ds6000 Series - IBM TotalStorage DS6000 Introduction And Planning Manual

This method uses Ethernet connections from a management console to each
controller. The management station can be the host or a workstation on the
Ethernet network.
Each RAID controller must have connectivity to each other and to your Storage
Management Console. Use the Ethernet interface ports on each RAID controller at
the rear of the storage enclosure to connect a pair of Ethernet cables from the
Storage Management Console to the controllers for direct management.

Disk drive module (DDM) storage features

Use the disk drive feature codes to order the disk drive sets for your base
enclosure or an expansion enclosure.
Disk drive sets contains 4 identical disk drives with the same capacity and rpm.
Disk drives are available in 73 GB (15,000 rpm), 146 GB (10,000 rpm), or 300 GB
(10,000 rpm) disk drives. A minimum of two disk drive feature codes (8 drives) are
required (see Table 6) for your DS6000 series configuration.
You also can order additional storage capacity to your base enclosure or to an
expansion enclosure. They also must be a minimum of two feature codes (8 drives).

Capacity calculation guidelines

To help you determine the type and number of disk drives to add to your storage
unit, calculate the physical and effective capacity of the disk drives.
Calculating physical and effective capacity
To calculate the total physical capacity of a DS6000 series, multiply each disk drive
set feature by its total physical capacity and sum the values.
The logical configuration of your DS6000 series storage affects the effective
capacity of the disk drive set.
Specifically, effective capacities depend on the following:
v Whether the physical capacity is logically configured as fixed block (FB) or count
v How the arrays on the system are combined into ranks
Table 6. Fibre-channel disk drive sets for DS6000 series
Feature
code Description
2002 146 GB (10K rpm) drive set
2004 300 GB (10K rpm) drive set
2052 73 GB (15K rpm) drive set
2990 HDD Dummy Carriers
key data (CKD)
Data for open systems must be logically configured as FB. Open systems hosts.
Data for zSeries must be configured as count key data (CKD).
One or more arrays are combined to create a contiguous storage space called a
rank. Each rank is divided into DS6000extents. The effective capacity for FB
extents will be different than the capacity for CKD extents.
Quantity
4 per feature
4 per feature
4 per feature
4 per feature
Chapter 3. Planning the physical configuration
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