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6-16 Sun StorEdge 5310 NAS Troubleshooting Guide • December 2004
FIGURE 6-10 Viewing ".chkpnt" in Windows Explorer
6.1.3 Object Checkpoint Restore
Checkpoints are read-only point-in-time images of a volume. They can be created
manually or scheduled to be created (and subsequently removed) by the system
without user intervention. By definition, objects within the checkpointed volume
cannot be modified; this is the very nature of checkpointing and desirable behavior.
Should a user wish to modify a checkpointed version of an object, they must first
return an instance of it to the live filesystem. Previously, the only way to accomplish
this was to employ standard client-based copy mechanisms, e.g., drag-and-drop on
Windows Explorer, the cp command on Unix systems. This method is inefficient for
a number of reasons:
■ The data is copied twice - from StorEdge to the client and from the client back to
StorEdge.
■ Precious network bandwidth is used.
■ Client resources (CPU, network, memory) are used to effect the copy operation
and not available for other purposes.