HP Configuring Arrays Reference Manual page 90

In Reconfigure mode, the default setting is the existing size of the logical drive. If you enter a larger value,
ACU extends the logical drive to the new size if there is unused drive capacity on the same array, as long as
the operating system supports logical drive extension. You cannot reduce the size of the logical drive.
CAUTION: Back up all data before extending a logical drive.
SizeBlocks
This option specifies the size of the logical drive in 512-byte blocks. Use this option to set an exact size
without rounding.
When ACU Scripting captures a configuration, it reports volume sizes rounded down to the nearest MB.
When the capture is played back, the size is reduced to fit within the already rounded MB size. This option
prevents the loss of volume size over successive generations of captures.
However, if the size does not fit the geometry of the array, caused by different disks or RAID levels, the size
will be rounded down to fit the geometry.
StripeSize
Beginning with ACU, ACU CLI, and ACU Scripting v8.55, the term stripe size has been replaced by strip
size. This labeling change does not affect functionality.
When distributing data across multiple physical drives (striping), the strip size is the amount of data that is
written to each physical drive. The full stripe size refers to the combined size of all the strips across all
physical drives, excluding parity-only drives.
For more information, see the option for StripSize (on page 90).
StripSize
Beginning with ACU, ACU CLI, and ACU Scripting v8.55, the StripSize option replaces the
StripeSize option. When distributing data across multiple physical drives (striping), the strip size is the
amount of data that is written to each physical drive. The full stripe size refers to the combined size of all the
strips across all physical drives, excluding parity-only drives.
You can enter a numerical value for this option to specify the size of the data strips (in kilobytes), or you can
leave this option blank and allow ACU to use a default value.
Strip sizes available for a RAID level vary based on the controller and the controller firmware level. The
maximum strip size changes dynamically and is reduced for arrays with a large number of data drives or
with smaller controller cache sizes. (The controller must be able to read an entire stripe of data at a time into
cache memory during transformation. Available memory is the limiting factor.
The following strip sizes are available:
•
8—8 KB
•
16—16 KB
•
32—32 KB
•
64—64 KB
•
128—128 KB
•
256—256 KB
HP Array Configuration Utility 90