HP Storage Essentials NAS Manager Software - Manual (Page 390)

Provisioning Manager 358
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About Volumes on HDS Storage Systems
Volumes from single LDEVs are shown as LDEV:0 on HDS storage systems. When volumes made
up of multiple LDEVs are first created, they are not mapped to a target port on the storage system.
The software remembers these LDEVs constitute a single volume, but it does not make changes 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. You can map the volume to the target port by 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), as shown
below:
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 same
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 the user account that 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.
Volumes are shipped already created on HDS and Symmetrix storage systems. When you create a
volume in the management server on these storage systems, you are defining the volume as being
allocated.
Keep in mind the following:
• 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 used to create the 14-GB LUSE volume. The management server would use three
LDEVs because each LDEV is really 6.87 GB.