HP Storage Essentials Enterprise Edition Software - Manual (Page 585)

HP Storage Essentials SRM 6.0 User Guide 547
to the storage system until the volume is mapped to a port. As a result, they are referred to as
Groups. For example:
Group:0(LDEV:0, LDEV:1)
where 0 in Group:0 is the volume identifier and LDEV:0 and LDEV:1 are the LDEVs that make up
this volume.
After you create a storage volume on an HDS storage system, you must map the volume to a target
port on the storage system, using the storage system Provisioning tool. In the tool, click Step 3, LUNs.
Once the volume is mapped, it is displayed as a logical unit size expansion (LUSE). For example:
LUSE:0(LDEV:0, LDEV:1)
where 0 in Group:0 is the volume identifier and LDEV:0 and LDEV:1 are the LDEVs that make up
this volume.
Creating a Storage Volume
IMPORTANT: Some storage vendors require a password to access the storage system. If the correct
password is not entered, an authentication error message is displayed. Refer to Options > Storage
Essentials > Discovery > Run Discovery Details Collection in HP Systems Insight Manager to
determine which user account was used to access the storage system during discovery.
When you create a storage volume, you can set its size, volume capabilities, and storage pool.
On HDS and Symmetrix storage systems, volumes are shipped already created. When you create a
volume in the management server on these storage systems, you are defining the volume as being
allocated.
Rounding Volume Size
Some vendor's tools for HDS might round off the volume size, so that a 6.87-GB volume appears as
7 GB (7168 MB) in the tool. The management server displays the size of the volume without
rounding. For example, assume you want to create a 14-GB (14336 MB) LUSE volume, and
according to the storage tool, you have two 7-GB LDEVs, which are really 6.87 GB (7034.88 MB).
If you look at the native tool, it would be logical to assume only two LDEVs would be required to
create the 14-GB LUSE volume. The management server would use three LDEVs because each LDEV
is only 6.87 GB.
If you are creating a volume on an HP EVA storage system, its external SMI-S provider may round
the specified number of megabytes to the nearest whole gigabyte.
Support for PvLinks
PvLinks based on HP disk partitions are not supported. Any volumes created on such PvLink meta
devices are shown as local. If you partition a regular (non-PvLink) external disk and create volumes
based on it, then volumes are recognized as external volumes.
For HDS Storage Systems
A LUSE volume on an HDS storage system is not created until you map that volume to a target array
port. In the management server, the create volume and LUN creation tasks are two different