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1-4 Introduction
Hitachi Universal Storage Platform V/VM Configuration Guide for SGI
®
IRIX
®
Host Attachment
Device Types
Table 1-1 describes the types of logical devices (volumes) that can be installed
and configured for operation with the USPV on an SGI IRIX operating system.
Table 1-2 lists the specifications for devices supported by the USP V. For
information about configuring devices other than OPEN+V, contact your
Hitachi Data Systems representative.
Note: Logical devices are defined to the host as SCSI disk devices, even
though the interface is fibre channel.
Table 1-1 Types of Logical Devices Supported by the USP V
Device Type Description
OPEN-x Devices OPEN- x logical units (LUs) (e.g., OPEN-3, OPEN-9) are disk devices of
predefined sizes. USP V supports OPEN-3, OPEN-8, OPEN-9, OPEN-E, OPEN-
L, and OPEN-V devices (OPEN-V is a VLL-based volume and has no standard
size). For the latest information about supported LU types, please contact
your Hitachi Data Systems account team.
LUSE Devices (OPEN-
x*n) LUSE devices are combined LUs that can be from 2 to 36 times larger than
standard OPEN-x LUs. Using LUN Expansion (LUSE) remote console software,
you can 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 10 OPEN-3 LUs is designated as an
OPEN-3*10 disk device. This lets the host combine logical devices and
access the data stored on the USP V using fewer LU numbers. For more
information about LUSE, see the
Hitachi Universal Storage Platform V LUN
Expansion (LUSE) and Virtual LVI/LUN User’s Guide (MK-96RD630).
VLL Devices (OPEN-x
VLL) VLL devices are custom-size LUs that are smaller than standard OPEN- x LUs.
Using Virtual LVI/LUN remote console software, you can configure VLL
devices by “slicing” a single LU into several smaller LUs that best fit your
application needs to improve host access to frequently used files. For more
information about the Virtual LVI/LUN feature, see the
Hitachi Universal
Storage Platform V LUN Expansion (LUSE) and Virtual LVI/LUN User’s Guide
(MK-96RD630). The product name for the OPEN- x VLL devices is OPEN- x -
CVS (CVS stands for custom volume size). The OPEN-L LU type does not
support Virtual LVI/LUN.
VLL LUSE Devices
(OPEN-x*n VLL) VLL LUSE devices combine Virtual LVI/LUN devices (instead of standard
OPEN-
x LUs) into LUSE devices. Use the Virtual LVI/LUN feature to create
custom-size devices, then use the LUSE feature to combine the VLL devices.
You can combine from 2 to 36 VLL devices into one VLL LUSE device. For
example, an OPEN-3 LUSE volume created from a0 OPEN-3 VLL volumes is
designated as an OPEN-3*10 VLL device (product name OPEN-3*10-CVS).