Whatever thin or thick file systems are created in V3 series unified storage systems, why does capacity have been allocated when the file systems are just created?

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Because by default, the storage system reserves 20% capacity for snapshots. You can change the value in the advanced properties when creating a file system.

Other related questions:
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.

Method used to expand file systems on OceanStor V3 storage systems
For details about the configuration method, see Expanding a File System .

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.

Storage of performance monitoring dump files in an OceanStor V3 storage system
The performance monitoring dump files of an OceanStor V3 storage system are stored in a package. You must use OceanStor DeviceManager to open the package.

What is the largest file system capacity supported by the file engine?
The file engine supports a maximum of 256 TB file system.

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