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Introduction to Advanced Volume
Configurations
The
Data Replication: Off-line versus On-line
Mirror versus Snapshot
A mirrored volume copy is a full, complete volume copy. A snapshot is only a record of changes to a volume. Because of this, its capacity can be smaller than a mirrored volume copy by as much as eighty percent. Both a mirrored volume copy and a snapshot can be exposed to a host like any other volume. However, unlike a mirrored copy, a snapshot is nonfunctional if its source volume goes
Actual Capacity versus Potential Capacity
Potential capacity is the maximum capacity a volume could be. Actual capacity is the capacity that the server recognizes a virtual volume as having.
Resizing versus Expanding
Resizing increases a virtual volume’s potential capacity. Expanding increases a virtual volume’s actual capacity. A volume must first be resized. Only after a volume is resized can it be expanded.
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