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# View file protection snapshot policies

Network-attached storage is a file-level storage architecture that makes stored data more accessible to networked devices.

## About this task

See Understanding PowerMax File for storage systems for an overview of PowerMax File.

A snapshot schedule manages the life cycle of file system snapshots. A schedule is created at the NAS server level and is assigned to one or more file systems within the NAS server. A schedule follows a rule that decides when a snapshot is taken place and when a snapshot is expired based on retention policy. As shown in Figure 1, Schedule rules are persisted in nameDB on cluster VDM. A schedule is persisted in nameDB on the user VDM. By default, a schedule is replicated and stored within configFS on user VDM. For the cases of local snapshot, a schedule can be configured as non-replicated and is stored within rootFS on user VDM.

Snapshots are not replicated on the destination. Only the snap schedules are replicated. However, user can take a snapshot or attach snap schedule on the destination.

If system Write pending WP% is above 50%, system gives priority to the IOs. Once WP% ratio comes down to below 50%, SRDF sync resumes.

If there are large numbers of invalid tracks that must be synchronized between the source and destination, the start operation might report a failure to the UI (Unisphere for PowerMax) but it completes in the background. Once the SRDF state moves into synchronized or consistent state which is reported in the replication session page, re-run the start operation from the UI.

Auto failover if there is disaster is not supported. The user has to perform failover of the replication sessions manually.

Click in the upper right corner to see a Initial Configuration window that outlines the configuration sequence. An overview of this configuration sequence is provided in Understanding PowerMax File for storage systems.

## Steps

1. Select a storage system that supports PowerMax File.
2. Select Data Protection > File Protection.
3. Select SNAPSHOT POLICIES.

   The following properties display:

   - Name—Policy name
   - NAS Server—ID of NAS server
   - File Systems—Number of file systems that are attached to the policy
   - Sync Replicated—Indication of sync replicated
   - Enabled—Indication that snapshot policy is enabled or disabled.
   - Health Indicator—Health indicator

   Click to view the following properties:

   - Name—Policy name
   - NAS Server—ID of NAS server
   - File Systems—Number of file systems that are attached to the policy
   - Sync Replicated—Indication of sync replicated
   - Enabled—Indication that snapshot policy is enabled or disabled.
   - Recovery Point Objective—Recovery Point Objective of the policy
   - File Snapshot Access Type—Snapshot Access Type
   - Retention Time—Retention Time of the Snapshots taken
   - Hourly Interval Offset—Offset value (if any) for hourly intervals
   - Alerts—Related alerts

   The following controls are available:

   - Create— Create or modify file protection snapshot policies
   - Modify— Create or modify file protection snapshot policies
   - Copy— Copy file protection snapshot policy
   - — Delete file protection snapshot policies

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