Acer HDS WMS100 Reference Manual
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Acer | HDS WMS100™ User and Reference Guide 89
5.6 Data Management Features and Functions
These features include:
Cache Residency Manager Functions
LUN Manager Functions
Data Retention Utility Functions
LUN Expansion
Password Protection
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
LUN Manager has two main functions: Fibre security control and host group.
The LUN Manager function prevents data from being destroyed by illegal accesses. Only
specified hosts are permitted to access LUNs.
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.
5.6.3 Data Retention Utility Function
The Data Retention Utility feature prevents the logical unit (volume) from being accessed
illegally by the host.
5.6.4 LUN Expansion Function
The LUN Expansion function expands the size of a logical unit (volume) accessed by a host
computer by combining multiple logical units (volumes) internally.
5.6.5 Password Protection Function
The Password Protection function restricts the number of Storage Navigator Modular users
who are allowed to access a disk array subsystem; it also prevents simultaneous access from
multiple users.