Data Management Features And Functions; Cache Residency Manager Function; Lun Manager Function; Data Retention Utility Function - Acer HDS AMS200 Reference Manual

5.6

Data Management Features and Functions

These features include:

Cache Residency Manager Function

LUN Manager Function

Data Retention Utility Function

LUN Expansion Function
Password Protection Function
5.6.1 Cache Residency Manager Function
The Cache Residency Manager function ensures that all data in an LU is stored in cache
memory. All read/write commands to the LU can be executed by cache hit 100% without
accessing the drive. The system throughput is improved when this function is applied to an
LU that contains data accessed frequently because no latency period is needed to access the
disk drive.
5.6.2 LUN Manager Function
The LUN Manager has four main functions: Fibre security control and host group (for Fibre
Channel interface), or iSCSI security control and target (for iSCSI interface).
Fibre Channel Interface
The Fibre security control function controls the access from specific hosts or specific
commands.
This function enables the subsystem to respond to each connected host (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.
iSCSI Interface
The iSCSI security function controls access from specified hosts or specific commands.
The target group function enables the subsystem to respond to each connected host
(even within the same port) by grouping the connected hosts within a port and setting
the locial unit mapping and Host Connection mode for each group. Up to 128 targets can
be set for one port. Authentication can be performed for each target by using the CHAP
authentication concurrently.
5.6.3 Data Retention Utility Function
The Data Retention Utility feature prevents the logical unit (volume) from being accessed
illegally by the host.
102 Chapter 5 Functional and Operational Characteristics