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Qsan Document – User Manual
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 job 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 job again.
Restart the task an hour later if failed:
The setting will be effective after enabling schedule
clone. When running out of the snapshot space, the virtual disk 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.
CAUTION:
The default snapshot space allocated by the system is two times the size of
source virtual disk. That is the best value of our suggestion. If user sets
snapshot space by manually and lower than the default value, user should take
the risk if the snapshot space is not enough and the clone job will fail.
Clear Clone
To clear the clone job, please follow the procedures.
1.
Select the source virtual disk, and then click
▼
-> Clear Clone
.
2.
Click
OK
button to clear clone job.
Clone Constraint
While the clone is processing manually, the increment data of the virtual disk is over the snapshot
space. The clone will complete the task, but the clone snapshot will fail. At the next time, when
trying to start clone, it will get a warning message “This is not enough of snapshot space for the
operation”. The user needs to clean up the snapshot space in order to operate the clone process.
Each time the clone snapshot failed, it means that the system loses the reference value of
incremental data. So it will start a full copy at the next clone process.
When running out of the snapshot space, the flow diagram of the virtual disk clone procedure will
be like the following.
