SANRAD I3.1.1205 - Manual (Page 162)

8-10 SANRAD V-Switch CLI User Manual
Active Snapshot
volume create –activate snapshot
You need four parameters to create an active snapshot volume:
S WITCH P ARAMETER D EFINITION S TATUS E XAMPLE
-vol VOLUME SNAPSHOT NAME MANDATORY Snapshot1
-src SOURCE SOURCE OF
SNAPSHOT MANDATORY QATesting
-ch CHILD SNAPSHOT CHILD MANDATORY Snapshot1
-lt LOAD THRESHOLD PERCENTAGE FULL
AT DESTINATION
TO TRIGGER AN
ALARM OPTIONAL
DEFAULT : 80%
75
Inactive Snapshot
volume create snapshot
You need four parameters to create an inactive snapshot volume:
S WITCH P ARAMETER D EFINITION S TATUS E XAMPLE
-vol VOLUME SNAPSHOT NAME MANDATORY Snapshot1
-src SOURCE SOURCE OF
SNAPSHOT MANDATORY QATesting
-ch CHILD SNAPSHOT CHILD MANDATORY Snapshot1
-lt LOAD THRESHOLD PERCENTAGE FULL
AT DESTINATION
TO TRIGGER AN
ALARM OPTIONAL
DEFAULT : 80%
75
Example:
Figure 8-6 shows a source volume with its first snapshot when the snapshot is
first created. Initially, a snapshot is empty because there has not yet been a
change in its source volume. Only when a write operation is performed on the
source volume will the snapshot begin to fill up. The pointer table for the
snapshot would point to the source volume for all sectors.