Managing Serviceguard Sixteenth Edition, March 2009

Examples of Storage on Disk Arrays
Figure 3-23 shows an illustration of storage configured on a disk array. Physical disks
are configured by an array utility program into logical units or LUNs which are then
seen by the operating system.
Figure 3-23 Physical Disks Combined into LUNs
NOTE: LUN definition is normally done using utility programs provided by the disk
array manufacturer. Since arrays vary considerably, you should refer to the
documentation that accompanies your storage unit.
Figure 3-24 shows LUNs configured with multiple paths (links) to provide redundant
pathways to the data.
NOTE: Under agile addressing, the storage units in these example would have names
such as disk1, disk2, disk3, etc. See “About Device File Names (Device Special
Files)” (page 107)
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Volume Managers for Data Storage 111