Security Planning: Full Disk Encryption; Disk Encryption Or Fde; Drive Slot Limit - IBM Midrange System DS4000 Series Hardware Manual

4.2.1 Disk Encryption or FDE

This feature provides the licensing to enable the disk encryption functions. This feature is for
activation only; you need to have also Encryption capable FC disk drives installed to actually
make use of the encryption function. With only the encryption capable drives, denominated
Full Disk Encryption (FDE) drives, or the activation feature, you cannot enable drive
encryption; you must have both.
For more information about FDE, see 4.1.7, "Security planning: Full Disk Encryption" on
page 123
4.2.2 Storage partitioning
Depending on the DS5000 storage subsystem, you can implement from 1 up to 512 partitions
per storage subsystem.
Depending on the quantity of hosts you plan to attach to your DS5000 storage subsystem,
you can request incremental licenses to activate the necessary partitions. Upon activation of
the optional Storage Partition feature, the DS Storage Manager enables management of a
single midrange disk storage system to function as multiple, logical storage systems to meet
the needs of storage consolidation in heterogeneous environments.

4.2.3 Drive slot limit

Depending on the DS5000 storage subsystem, the basic limit of the number of drives allowed
can be expanded by purchasing an additional feature and activating it in your server.
For all DS5000 models, the base number of disk drives supported can be upgraded up to 448
drives.
4.2.4 FlashCopy
A FlashCopy logical drive is a point-in-time image of a logical drive. It is the logical equivalent
of a complete physical copy, but you create it much more quickly than a physical copy.
Additionally, it requires less disk space. In Storage Manager, the logical drive from which you
are basing the FlashCopy, called the base logical drive, must be a standard logical drive in the
storage subsystem. Typically, you create a FlashCopy so that an application (for example, an
application to take backups) can access the FlashCopy and read the data while the base
logical drive remains online and user accessible.
FlashCopy takes only a small amount of space compared to the base image.
4.2.5 VolumeCopy
The VolumeCopy feature is a firmware-based mechanism for replicating logical drive data
within a storage subsystem. This feature is designed as a system management tool for tasks,
such as relocating data to other drives for hardware upgrades or performance management,
data backup, and restoring Snapshot™ logical drive data.
A VolumeCopy creates a complete physical replication of one logical drive (source) to another
(target) within the same storage subsystem. The target logical drive is an exact copy or clone
of the source logical drive. VolumeCopy can be used to clone logical drives to other arrays
inside the DS5000 storage subsystem. Careful planning should considered with regard to the
space available to make a FlashCopy of a logical drive.
Chapter 4. IBM System Storage DS planning and configuration
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