IBM System Storage DS3000 Programming Manual page 141

Parameter
securityType
T10PI
Notes
The drives parameter supports both high-capacity drive expansion enclosures and low-capacity drive
expansion enclosures. A high-capacity drive expansion enclosure has drawers that hold the drives. The
drawers slide out of the drive expansion enclosure to provide access to the drives. A low-capacity drive
expansion enclosure does not have drawers. For a high-capacity drive expansion enclosure, you must
specify the identifier (ID) of the drive expansion enclosure, the ID of the drawer, and the ID of the slot in
which a drive resides. For a low-capacity drive expansion enclosure, you need only specify the ID of the
drive expansion enclosure and the ID of the slot in which a drive resides. For a low-capacity drive
expansion enclosure, an alternative method for identifying a location for a drive is to specify the ID of
the drive expansion enclosure, set the ID of the drawer to 0, and specify the ID of the slot in which a
drive resides.
If you set the raidLevel parameter to RAID 1, the controller firmware takes the list of drives and pairs
them by using this algorithm:
Data drive = X
Parity drive = N/2 + X
In this algorithm X is 1 to N/2, and N is the number of drives in the list. For example, if you have six
drives, the mirror pairs are as follows:
You can use any combination of alphanumeric characters, hyphens, and underscores for the names.
Names can have a maximum of 30 characters.
Description
The setting to specify the security level when creating
the subsystem 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.
The setting to specify that an subsystem, and the
logical drives within the subsystem, has T10 PI
(Protection Information) to help you ensure that the
data maintains its integrity. When you use this
parameter, only protected drives can be used for the
subsystem. These settings are valid:
v none—The subsystem does not have T10 PI
(Protection Information).
v enabled—The subsystem has T10 PI (Protection
Information). The subsystem support is protected
information and is formatted with protection
information enabled.
Data
1
2
3
Parity
N/2 + 1 = 4
N/2 + 2 = 5
N/2 + 3 = 6
Chapter 3. Script Commands
3-95