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Hitachi Lightning 9900™ User and Reference Guide 47
3.7.15 LUN Manager
LUN Manager enables users to set and define the port modes for fibre-channel ports and to
set the fibre topology (e.g., FC-AL, fabric). Please connect your Hitachi Data Systems
account team for further details on this feature.
Note: For further information on LUN Manager, please see the Hitachi Lightning 990o™ LUN
Manager User’s Guide (MK-91RD049), or contact your Hitachi Data Systems account team.
3.7.16 LU Size Expansion (LUSE)
The LUSE (LU Size Expansion) feature allows users to create virtual LUs that are larger than
standard OPEN LUs, by expanding the size of a selected LU up to 36 times its normal size.
The maximum size depends on the type of configuration. For example, you can expand an
OPEN-9 LU to a maximum size of 265 GB (7.3 GB × 36). This capability enables open-system
hosts to access the data on the entire 9900 subsystem using fewer logical units. LUSE allows
host operating systems that have restrictions on the number of LUs per interface to access
larger amounts of data.
Note: For further information on LUSE, please see the Hitachi Lightning 9900™ LUN Manager
User’s Guide (MK-91RD049), or contact your Hitachi Data Systems account team.
3.7.17 Virtual LVI/LUN
Virtual LVI/LUN allows users to convert fixed-size volumes into several smaller variable
custom-sized volumes. Using the Remote Console PC, users can configure custom-size
volumes by assigning a logical address and a specific number of cylinders/tracks (for S/390
®
data) or MB (for open-systems data) to each custom LVI/LU.
Virtual LVI/LUN improves data access performance by reducing logical device contention as
well as host I/O queue times, which can occur when several frequently accessed files are
located on a single volume. Multiple LVI/LU types can be configured within each array
group. Virtual LVI/LUN enables the user to more fully utilize the physical storage capacity of
the 9900, while reducing the amount of administrative effort required to balance I/O
workloads. When Virtual LVI/LUN is used in conjunction with FlashAccess, the user can
achieve even better data access performance than when either Virtual LVI/LUN or
FlashAccess is used alone.
Note: For further information on Virtual LVI/LUN, please see the Hitachi Lightning 9900™
Virtual LVI/LUN User’s Guide (MK-90RD005), or contact your Hitachi Data Systems account
team.