Device Types And Configuration Procedures - Hitachi Freedom Storage Lightning 9900 V series Configuration Manual

1.3

Device Types and Configuration Procedures

The 9900V subsystem allows the following types of logical devices (LDEVs) to be installed
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and configured for operation with the Red Hat Linux operating system. Table 1.1 lists the
device specifications for the 9900V devices.
OPEN-x Devices The standard OPEN-x logical units (LUs) (e.g., OPEN-3, OPEN-9) are disk
devices of predefined sizes. The 9900V subsystem currently supports OPEN-3, OPEN-9, OPEN-
E, and OPEN-L devices. Please contact your Hitachi Data Systems account team for the latest
information on supported LU types.
LUSE Devices (OPEN-x*n) The LUSE devices are combined LUs that can be from 2 to 36
times larger than standard OPEN-x LUs. The Logical Unit Size Expansion (LUSE) feature of the
9900V subsystem enables you to configure these custom-size devices. LUSE devices are
designated as OPEN-x*n, where x is the LU type (e.g., OPEN-9*n) and 2 ≤ n ≤ 36. For
example, a LUSE device created from ten OPEN-3 LUs would be designated as an OPEN-3*10
disk device. This capability enables the server host to combine logical devices and access
the data stored on the 9900V subsystem using fewer LU numbers (LUNs). For further
information on the LUSE feature, please refer to the Hitachi Lightning 9900™ V Series LUN
Expansion and Virtual LVI/LUN User's Guide (MK-92RD104).
VLL Devices (OPEN-x VLL) The Virtual LVI/LUN (VLL) feature of the 9900V subsystem
enables you to "slice up" a single LU into several smaller LUs to best fit your application
needs and improve host access to frequently used files. For further information on the
Virtual LVI/LUN feature, please refer to the Hitachi Lightning 9900™ V Series LUN Expansion
(LUSE) and Virtual LVI/LUN User's Guide (MK-92RD104). Note: The OPEN-L LU does not
support Virtual LVI/LUN.
VLL LUSE Devices (OPEN-x*n VLL) The VLL LUSE devices combine Virtual LVI/LUN devices
(instead of standard OPEN-x LUs) into LUSE devices. The Virtual LVI/LUN feature is used first
to create custom-size devices, and then the LUSE feature is used to combine (concatenate)
these Virtual LVI/LUN devices. The user can combine from 2 to 36 Virtual LVI/LUN devices
into one VLL LUSE device. For example, an OPEN-3 LUSE volume that was created from ten
OPEN-3 Virtual LVI/LUN volumes would be designated as an OPEN-3*10 VLL device. Note: The
OPEN-L LU does not support Virtual LVI/LUN.
Hitachi Lightning 9900™ V Series Red Hat Linux Configuration Guide 3
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