Parameter
Description
securityType
The setting to specify the security level when
creating the subsystems and all associated logical
drives. These settings are valid:
v
none – The subsystem and logical drives are not
secure.
v
capable – The subsystem and logical drives are
capable of having security set, but security has
not been enabled.
v
enabled – The subsystem and logical drives have
security enabled.
Note:
If you do not specify any properties, this command returns the RAID Level 5 candidates for each
drive type. If RAID Level 5 candidates are not available, this command returns candidates for RAID
Level 6, RAID Level 3, RAID Level 1, or RAID Level 0. When you specify auto configuration properties,
the controllers validate that the firmware can support the properties
Drives and subsystem
A subsystem is a set of drives that are logically grouped together by the controllers in the storage
subsystem. The number of drives in an subsystem is a limitation of the RAID level and the controller
firmware. When you create an subsystem, follow these guidelines:
v
Beginning with firmware version 7.10, you can create an empty subsystem so that you can reserve the
capacity for later use.
v
You cannot mix drive types, such as SAS and Fibre Channel, within a single subsystem.
v
The maximum number of drives in an subsystem depends on these conditions:
– The type of controller
– The RAID level
v
RAID levels include: 0, 1, 10, 3, 5, and 6.
– In a DS4700 Model 70 or a DS4700 Model 72 storage subsystem, a subsystem with RAID level 0 and
an subsystem with RAID level 10 can have a maximum of 112 drives.
– In a DS4800 (Models 82, 84, 88) storage subsystem, an subsystem with RAID level 0 and an
subsystem with RAID level 10 can have a maximum of 224 drives.
– An subsystem with RAID level 3, RAID level 5, or RAID level 6 cannot have more than 30 drives.
– An subsystem with RAID level 6 must have a minimum of five drives.
– If an subsystem with RAID level 1 has four or more drives, the storage management software
automatically converts the subsystem to a RAID level 10, which is RAID level 1 + RAID level 0.
v
If an subsystem contains drives that have different capacities, the overall capacity of the subsystem is
based on the smallest capacity drive.
v
To enable enclosure loss protection, you must create an subsystem that uses drives located in at least
three drive expansion enclosures.
Hot Spares
Hot spare drives can replace any failed drive in the storage subsystem. A hot spare drive must have
capacity greater than or equal to any drive that can fail. If a hot spare drive is smaller than a failed drive,
you cannot use the hot spare drive to rebuild the data from the failed drive. Hot spare drives are
available only for RAID Level 1, RAID Level 3, RAID Level 5, or RAID Level 6.
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