IBM System Storage DS3000, Programming Manual

Page: 137 / 652

Parameter Description
freeCapacityArea
The index number of the free space in an existing
subsystem that you want to use to create the new logical
drive. Free capacity is defined as the free capacity
between existing logical drives in an subsystem. For
example, an subsystem might have the following areas:
logical drive 1, free capacity, logical drive 2, free capacity,
logical drive 3, free capacity. To use the free capacity
following logical drive 2, you would specify:
freeCapacityArea=2
Run the
show subsystem
command to determine if the
free capacity area exists.
capacity The size of the logical drive that you are adding to the
storage subsystem. Size is defined in units of
bytes
,
KB
,
MB
,
GB
, or
TB
.
owner
The controller that owns the logical drive. Valid
controller identifiers are
a
or
b
, where
a
is the controller
in slot A, and
b
is the controller in slot B. If you do not
specify an owner, the controller firmware determines the
owner.
cacheReadPrefetch
The setting to turn on or turn off cache read prefetch. To
turn off cache read prefetch, set this parameter to
FALSE .
To turn on cache read prefetch, set this parameter to
TRUE .
segmentSize The amount of data (in KB) that the controller writes on
a single disk drive in a logical drive before writing data
on the next disk drive. Valid values are
8
,
16
,
32
,
64
,
128
,
256
, or
512
.
usageHint
The settings for both the
cacheReadPrefetch
parameter
and the
segmentSize
parameter to be default values. The
default values are based on the typical I/O usage pattern
of the application that is using the logical drive. Valid
values are
fileSystem , dataBase , or multiMedia .
dssPreAllocate The setting to make sure that reserve capacity is
allocated for future segment size increases. The default
value is
TRUE .
securityType 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.
Chapter 3. Script Commands
3-91