Logical Storage Elements; Logical Drives (Luns) - HP ML110 G1 User Manual

Logical storage elements

Logical storage elements consist of those components that translate the
physical storage elements to file system elements. The storage server
utilizes the WebUI to manage the various types of disks presented to the
file system. The WebUI has two types of LUN presentation, basic disk and
dynamic disk. Each of these types of disk has special features that enable
different types of management.

Logical drives (LUNs)

While an array is a physical grouping of hard drives, a logical drive
consists of components that translate physical storage elements into file
system elements.
It is important to note that a LUN may extend over (span) all physical drives
within a storage controller subsystem, but cannot span multiple storage
controller subsystems.
L1
L2
Figure 6 2 arrays (A1, A2) and 5 logical drives (L1 through
L5) spread over 5 physical drives
NOTE:
This type of configuration may not apply to all storage servers and serves
only as an example.
Through the use of basic disks, primary partitions or extended partitions
can be created. Partitions can only encompass one LUN. Through the use
of dynamic disks, volumes can be created that span multiple LUNs. The
WebUI can be used to convert disks to dynamic and back to basic, and
36 Storage Management Overview
A1
A2
L3
L4
L5