Figure 12-19 Local Cloning Options - Qsan XS5224D User Manual

Figure 12-19 Local Cloning Options

 Automatic Snapshot Space Allocation Ratio: This setting is the ratio of the source
volume and snapshot space. If the ratio is set to 2, when there is no snapshot space
assigned for the volume, the system will automatically reserve a free pool space to set
as the snapshot space with twice capacity of the volume. The options are 0.5 ~ 3.
 Automatic Snapshot Checkpoint Threshold: The setting will be effective after enabling
schedule clone. The threshold will monitor the usage amount of the snapshot space.
When the used snapshot space achieves the threshold, system will take a snapshot and
start clone process automatically. The purpose of threshold could prevent the
incremental copy failure immediately when running out of the snapshot space. For
example, the default threshold is 50%. The system will check the snapshot space every
hour. When the snapshot space is used over 50%, the system will start clone task
automatically. And then continue monitoring the snapshot space. When the rest
snapshot space has been used 50%, in other words, the total snapshot space has been
used 75%, the system will start clone task again.
 Restart the task an hour later if failed The setting will be effective after enabling a
scheduled clone. When running out of snapshot space, the volume clone process will be
stopped because there is no more available snapshot space. If this option is checked,
the system will clear the snapshots of clone in order to release snapshot space
automatically, and the clone task will be restarted after an hour. This task will start a full
copy.
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CAUTION:
The default snapshot space allocated by the system is two times the
capacity of source volume. That is the best value of our suggestion. If
user sets snapshot space manually and lower than the default value,
understand that if the snapshot space is not enough, the clone task will
fail.