Logical Units; Creating A New Logical Unit - HP StorageWorks 2000s User Manual

Logical Units

A Logical Unit (LU) is a logically mapped disk device that is created from a physical device
or from a storage pool.
Hosts (file and application servers) do not have access to physical resources; they have
access only to LUs. This means that physical resources must be defined as LUs first, and
then assigned to hosts so they can access them.When a LU is assigned to a host, the host
views the LU as its own attached storage device.
LUs offer the added capability of disk expansion. Additional storage blocks can be allocated
from the LU's physical device or storage pool and appended to the end of the existing LU
without erasing the data on the disk. Each LU may be expanded up to 2 TB.
When you select Logical Units from the main iSCSI screen, you will see a list of all existing
LUs. Information about each LU is included here. To search for a specific LU, type its name
(or a few letters) and click Go. Only those LUs that match the letters you typed will be
displayed.
From the Logical Units screen, the following functions are available:
• New - Create a new LU and assign it to a host.
• Import - Import a hard drive with existing data to take advantage of the iSCSI Feature
Pack's storage services.
• Delete - Delete a LU.
• View Layout - See where a LU's components are located.
• Expand - Increase the size of a LU.
• Hosts - Change the host assignment or access rights for a LU.
• Properties - View configuration of a LU or change the LU name.

Creating a New Logical Unit

NOTE: If you want a LU to include storage from multiple physical devices, you need to create a
storage pool before creating the LU. Refer to the Configuring Your iSCSI System section
for more details.
1. Select Logical Units from the main iSCSI screen.
2. Click New.
3. Enter a name for the new LU.
HP StorageWorks iSCSI Feature Pack User Guide
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