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If deleting the expired snapshots does not still result in reaching the thresholds, the system starts deleting the detached oldest snapshots with the automatic deletion option enabled. Data that already exists on a LUN will not have data reduction applied after data reduction is enabled. The Advanced Deduplication option helps increase the storage efficiency of systems above what is achieved with data reduction on a LUN, file system, or datastore.
This feature is triggered when the total pool consumption or pool consumption by the snapshots reach a high threshold you define. It is recommended that you:. Automatic snapshot deletion is a space management feature used to automatically manage the of snapshots in a pool. Applying data reduction saves space on the system.
Introduction to Data Efficiency Unity Family technical documentation. Uses a data relocation process to periodically make storage tiering adjustments. Caches KB data chunks for higher performance. A single switch called Data Reduction controls deduplication of the blocks at an individual LUN and file system level. It provides the ability to reduce the amount of storage needed for user data by keeping only a small of copies often just one copy of a data block with a given content.
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Unity Family technical documentation. Automatic deletion does not apply to snapshots attached to hosts, including attached groups of snapshots on a consistency group.
Expiration time. Adding a subsequent switch called Advanced Deduplication controls a deeper, dynamic ability for deduplicating data blocks within a given storage resource that do not contain internally-defined data patterns. It also does not apply to system snapshots used for replication.
The following table explains the automatic snapshot deletion options:. An All-Flash pool can contain both data reduction-enabled and non-data reduction enabled LUNs, file systems, or datastores. You can set a snapshot of a storage resource for automatic deletion when the snapshot expires by setting a snapshot expiration date or the associated pool reaches the auto delete threshold settings. The system automatically starts deleting old and expired snapshots until the pool space reaches a set threshold.
Advanced deduplication can be enabled only if data reduction is enabled first. Note: If a snapshot has automatic snapshot deletion enabled, it cannot be used as a source snapshot for creating or refreshing a thin clone. Data reduction includes savings from deduplicating blocks which contain internally-defined data patterns, including zero detection and compression.
This is the time when the snapshot expires. Applies to snapshots of storage resources. The data relocation schedule is configurable, and the data relocation can take place once a day or on an ongoing basis throughout the day.
This ensures that the storage system resources are not wasted in copying data from one Flash drive to another. Applies to snapshots of storage resources and pools. Hybrid pools cannot have data reduction enabled, and you cannot create a data reduction-enabled LUN, file system, or datastore in a hybrid pool.
Adapts continuously to changes in workload. Data reduction is applied on all new incoming writes.
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Data that cannot be deduplicated or compressed is detected, and is written uncompressed. If you need to convert an All-Flash pool to a hybrid pool adding non-Flash drives to an All-Flash poolany LUNs, file systems, or datastores that use data reduction must be deleted or moved.
When the pool reaches a certain threshold, the system automatically deletes the snapshot. The thin file system must be created on a Unity system that is running OE version 4. Show. Expired snapshots are deleted first.