Manage your storage space
Perform data pruning
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In the Data Storage Management page, scroll down to the Storage Consumption by features as on yyyy-mm-dd section.
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Select one or more features and click Prune. You can't select Config as it includes all the system configurations.A pop-up window prompts you to confirm if you want to delete all the data for the selected features. Click Yes, Prune.

View prune history
View storage event logs
Review data retention policy
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Event messages
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Syslog messages
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Network reporting data
Notify on exceeding storage limit
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In the Actions tile, click Notify on exceeding storage limit.
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In the Configure System Notifications page, under the System Event Category, make sure the DataStorageExceeded category is selected to receive notifications.