Hitachi Virtual Storage Platform, Руководство пользователя и справочник

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Introduction
1–9
Hitachi VSP User and Reference Guide
• Support for RAID6 (6D+2P), RAID5 (3D+1P/7D+1P), and RAID1
(2D+2D/4D+4D) See Functional and Operational Characteristics on
page 2-1 for more information on RAID levels.
• All main system components are configured in redundant pairs. If one of
the components in a pair fails, the other component performs the
function alone until the failed component is replaced. Meanwhile, the
storage system continues normal operation.
• The Virtual Storage Platform is designed so that it cannot lose data or
configuration information if the power fails. This is explained in Battery
backup operations on page 4-5 .
Non-disruptive service and upgrades
The Virtual Storage Platform storage system is designed so that service and
upgrades can be performed without interrupting normal operations. These
features include:
• Main components can be “hot swapped” — added, removed, and
replaced without any disruption — while the storage system is in
operation. The front and rear fan assemblies can be moved out of the
way to enable access to disk drives and other components, but not both
at the same time. There is no time limit on changing disk drives because
either the front or rear fans cool the unit while the other fan assembly
is turned off and moved out of the way.
• A Service Processor mounted on the controller chassis monitors the
running condition of the storage system. Connecting the SVP with a
service center enables remote maintenance.
• The firmware (microcode) can be upgraded without disrupting the
operation of the storage system. The firmware is stored in shared
memory (part of the cache memory module) and transferred in a batch,
reducing the number of transfers from the SVP to the controller chassis
via the LAN. This increases the speed of replacing the firmware online
because it works with two or more processors at the same time.
Economical and quiet
The three-speed fans in the control and drive chassis are thermostatically-
controlled. Sensors in the units measure the temperature of the exhaust air
and set the speed of the fans only as high as necessary to maintain the unit
temperature within a preset range. When the system is not busy and
generates less heat, the fan speed is reduced, saving energy and reducing
the noise level of the system.
When the storage system is in standby mode, the disk drives spin down and
the controller and drive chassis use significantly less power. For example, a
system that consumes 100 amps during normal operation, uses only 70
amps while in standby mode.
Specifications
The following tables provide general specifications of the Virtual Storage
Platform. Additional specifications are located in Specifications on page A-1 .