Using command lines to create snapshots of V3 series unified storage systems

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The create snapshot general command is used to create snapshots. Run this command when you want to create a fully usable copy for a data object at a time point.

Other related questions:
Methods used to create a snapshot in an OceanStor V3 storage system
There are four methods for creating a snapshot in an OceanStor V3 storage system: 1. You can manually create snapshots for LUNs using OceanStor DeviceManager. 2. You can use OceanStor ReplicationDirector to configure a periodic snapshot policy for LUNs. Then, snapshots will be periodically created for LUNs. 3. You can manually create snapshots for file systems using OceanStor DeviceManager. 4. You can configure a periodic snapshot policy for file systems using OceanStor DeviceManager. Then, snapshots will be periodically created for file systems.

Whether more snapshots can be created for a file system of a V3 series unified storage system when the snapshot count of the file system reaches the limit
When the snapshot count of a file system reaches the limit: 1. If snapshots are manually created, no more snapshots can be created. 2. If the scheduled snapshot function is configured, more snapshots can be created but the earliest snapshots will be automatically deleted.

Precautions for creating a remote link for a V3 series unified storage system
The precautions for creating a remote link for a V3 series unified storage system V300R002 are as follows: 1. If a Fibre Channel network is used, set Link Type to FC. If an IP network is used, set Link Type to iSCSI. 2. If the storage systems at the two ends are of different versions, initiate link creation from the storage system with the later version. Otherwise, the link creation fails.

Source of snapshot resource pool space of V3/T series unified storage systems and results of storage pool space being used up
The LUN snapshot resource pool uses the internal space of the storage pool. When the space usage of the storage pool reaches the high watermark, an alarm is generated. When the space of the storage pool is used up, the snapshot function is disabled. Hosts can still access LUNs to which space has been allocated. Snapshots of the file system use the space of the file system. When the percentage of space used for storing file system snapshots exceeds the preset percentage, no alarm is generated, and the available capacity of the file system is used. When the used capacity of the file system exceeds the threshold, an alarm is generated.

Method used to check the snapshot data of a file system in an OceanStor V3 storage system
After creating a snapshot for a file system, you must enable the hidden directory of the snapshot to be visible. Then, you can share the snapshot to a client using the NFS or CIFS sharing service provided by the OceanStor storage system. After sharing the snapshot to a client, you can access and obtain the snapshot data generated at a point in time on the client.

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