Compaq StorageWorks HSZ70, Installation Manual, Page: 69 / 168

Creating Your Storage Configuration with the CLI 6-13
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Writer: Robert Young Project: HSZ70 Solutions Software V7.7 for Novell NetWare - PCI Comments:
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Creating a Stripeset
Use stripesets to stripe data across multiple disks. Striping data across multiple
disks increases I/O performance compared with the performance of a single
disk. Stripsets must have at least two members and can have as many as
fourteen. This example creates a three member stripeset using the ADD
STRIPESET command.
HSZ70 > ADD STRIPESET DVGRPS0 DISK10100 DISK20100 DISK30100
In this example, “
DVGRPS0
” is the name of the stripeset, and it is followed by
a list of the disks to be included in the stripeset. The names of the stripesets are
user selectable. Performance of your stripesets will be optimized if each
stripeset includes disks from different busses (ports) as shown in Figure 6-4.
Initializing a Stripeset
Before putting a stripeset into service as a logical unit, you must initialize it.
The INITIALIZE command copies controller metadata onto a small amount of
disk space available on the stripeset and makes this space inaccessible to the
host.
When you initialize a stripeset, you can specify a chunksize. A chunksize is
the number of blocks of data that is transferred at one time. By using the
default chunksize, the controller will optimize the chunksize by selecting a
number equal to the number of blocks in one track of disk data. Compaq
recommends using the default chunksize.
HSZ70 > INITIALIZE DVGRPS0 CHUNKSIZE=DEFAULT
Adding a Stripeset as a Logical Unit
To make a stripeset available to the host computer, you must identify it as a
host logical unit. The unit number is a one or three digit number preceded by
“D.” The unit number identifies the controller’s target number and the stripeset
as the Logical Unit (LUN) connected to the target. Units identified with
controller target number 0 have a single digit number which corresponds to
LUN number. For example, D5 would be target 0, LUN 5. Units identified
with controller targets 1 through use a 3 digit number. The first digit
corresponds to the controller target number, the second digit is always 0 and
the third digit to the LUN number.
For example, D205 would be target 2, LUN 5. You must now identify the
stripesets as Host Logical Units by using the ADD UNIT command.