Functional and Operational Characteristics
2–7
Hitachi VSP User and Reference Guide
The LVI configuration of the Virtual Storage Platform storage system
depends on the RAID implementation and physical data drive capacities.
The LDEVs are accessed using a combination of logical disk controller
number (00-01), CU number (00-FE), and device number (00-FF). All
control unit images can support an installed LVI range of 00 to FF.
Logical units
The Virtual Storage Platform storage system is configured with OPEN-V
logical unit types. The OPEN-V logical unit can vary in size from 48.1 MB to
4 TB. For information on other logical unit types (e.g., OPEN-9), contact
Hitachi Data Systems support.
For maximum flexibility in logical unit configuration, the Virtual Storage
Platform provides the VLL and LUN Expansion (LUSE) features. Using VLL,
users can configure multiple logical units under a single LDEV. Using Virtual
LVI or LUSE, users can concatenate multiple logical units into large volumes.
For further information on VLL and Virtual LVI, see the Performance Guide
and the Provisioning Guide for Open Systems
Mainframe operations
This section provides high-level descriptions of mainframe compatibility,
support, and configuration.
Mainframe compatibility and functionality
In addition to full System-Managed Storage (SMS) compatibility, the Virtual
Storage Platform storage system provides the following functions and
support in the mainframe environment:
• Sequential data striping
• Cache fast write (CFW) and DASD fast write (DFW)
• Enhanced dynamic cache management
• Extended count key data (ECKD) commands
• Multiple Allegiance
• Concurrent Copy (CC)
• Peer-to-Peer Remote Copy (PPRC)
• Compatible FlashCopy® V2
• Parallel Access Volume (PAV)
• Enhanced CCW
• Priority I/O queuing
• Red Hat Linux for IBM S/390 and zSeries
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