Review the following best practices before using Dell EMC VNX / CLARiiON.
General
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Ensure that sufficient number of Save Area devices are configured to meet your retention requirements.
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Ensure that sufficient disk space is available for snapshot operations and the disk space used by snapshots is monitored frequently.
The space requirement for snapshots created during IntelliSnap backup can vary based on your environment. The space utilization is dependent on the number of snapshots created and the retention period defined for the snapshots.