Device Types - Hitachi Universal Storage Platform V Configuration Manual

Device Types

Table 1-1
and configured for operation with the USPV on an SGI IRIX operating system.
Table 1-2
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
Device Type
OPEN-x Devices
LUSE Devices (OPEN-
x*n)
VLL Devices (OPEN-x
VLL)
VLL LUSE Devices
(OPEN-x*n VLL)
1-4
Hitachi Universal Storage Platform V/VM Configuration Guide for SGI
describes the types of logical devices (volumes) that can be installed
lists the specifications for devices supported by the USP V. For
Types of Logical Devices Supported by the USP V
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 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 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 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).
Description
Introduction
® ®
IRIX Host Attachment