Hitachi AMS 2100, Hardware Manual

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Introduction
Hitachi AMS 2100/2300 Storage System Hardware Guide
Data management features and functions
The AMS 2100/2300 includes several high-performance features that
implement easy and fast data management. These features are described
in Table 1-12 .
Table 1-12: Data Management Features and Functions
Feature Description
Cache Residency
Manager The Cache Residency Manager feature makes data of specific
logical units resident in a cache and makes all accesses to the
LUs from the host cache hit without making any disk accesses
occur.
When the function is applied to a logic unit frequently
accessed, it is expected that the throughput is increased
because all data Read/Write can be performed as cache hits.
LUN Manager The LUN Manager feature consists of two main functions for
Fibre Channel and two for iSCSI:
•
The Fibre Channel security function controls the
access from specific hosts or specific commands.
•
The host group function (for Fibre Channel interface)
enables also the array to make a suitable response to each
host connected even within the same port by grouping
connected hosts within a port and setting the logical unit
mapping and the Host Connection mode for each host group.
Up to 128 host groups can be set
•
The iSCSI security function controls the access from
specified hosts or specific commands.
•
iSCSI target interface. The iSCSI security function
controls access from specified hosts or specific commands.
LUN Expansion The LUN Expansion feature is used to expand the size of
logical unit (volume) to which a host computer accesses by
combining multiple logical units (volumes) internally.
Data Retention Utility The Data Retention Utility feature prevents the logical unit
(volume) from being accessed illegally by the host.
Audit Logging Function The Audit Logging function generates a syslog to audit the
event when the user performs the setting operation for the
disk array system, and outputs the syslog to the external
server
.
Account Authentication
Function The Account Authentication function authenticates login to
the array unit based on the account information registered by
the user and controls the access to the array resource. This
prevents the illegal operation by the unauthorized person.
Audit Logging Function The Audit Logging function generates a syslog to audit the
event when the user performs the setting operation for the
disk array system, and outputs the syslog to the external
server.
Dynamic Provisioning Dynamic provisioning is a function that improves the capacity
efficiency of disk drives by assigning physical capacity On
Demand at the time of the Write command receipt without
assigning the physical capacity to logical units.