Parallel Access Volumes; Base And Alias Exposures; Multiple Allegiance For Ficon Hosts; Host Systems That Ds6000 Series Supports - IBM TotalStorage DS6000 Introduction And Planning Manual
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Parallel access volumes
Parallel access volumes (PAVs) allow your system to access volumes in parallel.
A PAV capability represents a significant performance improvement by the storage
unit over traditional I/O processing. With PAVs, your system can access a single
volume from a single host with multiple concurrent requests.
You must configure both your storage unit and operating system to use PAVs. You
can use the logical configuration definition to define PAV-bases, PAV-aliases, and
their relationship in the storage unit hardware. This unit address relationship creates
a single logical volume, allowing concurrent I/O operations.
Static PAVs are PAVs in which the association between a PAV-base address and its
PAV-aliases is pre-defined and fixed. That is, the PAV-aliases of a PAV-base
address remain unchanged. Dynamic PAVs, on the other hand, are PAVs in which
the association between a PAV-base address and its PAV-aliases is dynamic. The
device number types (PAV-alias or PAV-base) must match the unit address types as
defined in the storage unit hardware.
The DS6000 series supports concurrent or parallel data transfer operations to or
from the same volume from the same system or system image for zSeries hosts.
Base and alias exposures
An exposure is a device extension that enables an MVS system to perform multiple
concurrent I/O operations to the device.
The storage unit uses two types of exposures:
v Base exposure: A device number associated with a parallel access volume (PAV).
v Alias exposure: A device number that is associated with a base exposure and
Multiple allegiance for FICON hosts
The DS6000 series provides multiple allegiance facility support for FICON hosts.
The multiple allegiance facility enables the storage unit to accept concurrent I/O
requests for a volume from multiple channel paths. This enables the storage unit to
process requests from separate FICON hosts in parallel. Parallel processing of
requests improves throughput and performance. The multiple allegiance facility
does not require any user action.
Host systems that DS6000 series supports
The DS6000 series provides a variety of host attachments so that you can
consolidate storage capacity and workloads for open-systems hosts and zSeries
hosts. The storage unit can be configured for fibre-channel adapters, for support of
fibre-channel protocol (FCP) and fibre connection (FICON) protocol.
For fibre channel attachments, you can establish zones. The zones must contain a
single port that is attached to a system adapter with the desired number of ports
that are attached to the storage unit. By establishing zones, you reduce the
It is used for query, data control, and data access operations.
that represents the same logical volume as the base device number. It is used
for data access I/O operations, query, and control operations.
19
Chapter 1. Introduction
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