Logical storage elements
Logical storage elements consist of those components that translate the
physical storage elements to file system elements. The storage server uses
the WebUI to manage the various types of disks presented to the file
system. The WebUI has t wo types of LUN presentation: basic disk and
dynamic disk. Each of these types of disk has special features th at enable
different types of management.
Logical drives (LUNs)
Whileanarrayisaphysicalgroupingofharddrives,alogicaldrive
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 spa n multiple storage
controller subsystems.
L4
L5
L3
A1
L1
L2
A2
Figure 6 Two arrays (A1, A2) and five logical drives (L1
through L5) spread over five 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
WebU I can be used to convert disks to dynamic and back to basic, and
36 Storage management overview
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