IBM XIV Gen3 Series User Manual

Note: The modem is no longer supported as part of the rack configuration for
Indonesia and Brazil. For more information, contact your IBM planning
representative.
Capacity
Each data module and interface module contains twelve 1 TB limited capacity, 2
TB, 3 TB, 4 TB, or 6 TB disk drive modules (DDMs).
You can only order an XIV system with DDMs of the same capacity, either 1 TB
hard drive size, 2 TB, 3 TB, 4 TB, or 6 TB. You cannot order an XIV system with a
mix of DDM capacities.
Note: Only the 4 TB and 6 TB DDM options are available for model 281x-314.
For data and interface modules with 1 TB limited-capacity, the modules contain
2 TB DDMs, but the usable capacity is limited to 1 TB by using the short-stroking
method. By short stroking the DDM, only the outer sectors of the disk platters are
used to store data. Head repositioning delays are minimized, which results in
shorter access times and increased I/O performance.
The following tables list the total capacity and usable capacity available in fully
populated and partially populated racks for each supported DDM capacity. The
usable capacity is the amount of space that can be used for data storage. The
remaining space is used for system activities, data redundancy, and spare capacity.
For usable capacity, the decimal is rounded down.
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Interface module 9
Interface module 8
Interface module 7
InfiniBand switch 2
InfiniBand switch 1
Maintenance module 1
Interface module 6
Interface module 5
Interface module 4
Data module 3
Data module 2
Data module 1
Modem
Uninterruptible power supply 3
Uninterruptible power supply 2
Uninterruptible power supply 1
Automatic transfer switch
Figure 4. Example of a minimally populated XIV system for model 281x-314
Chapter 4. Physical configuration and features 15

IBM XIV Gen3 Series Specifications

General

Brand	IBM
Model	XIV Gen3 Series
Category	Storage
Language	English