Key Concepts
File System
A file storage instance applied for by users through the console, API, etc. The file system is the entity for users to perform operations such as data management and mount management.
File System Name
A user-defined string used to describe the usage scenario, business type, etc., of a file system, facilitating the identification of specific file system instances.
Storage Type
The product type of the file system. Currently, the storage types of file storage are divided into capacity-oriented (using SATA media) and performance-oriented (using SSD media) based on the storage media used for data.
Capacity
The space size specified when purchasing the file system. The capacity remains unchanged until an expansion operation is performed.
Remaining Capacity
The available space of the file system. As more files are written and directories are created in the file system, the remaining capacity decreases. When the remaining capacity is insufficient for business needs, expansion should be performed in a timely manner.
Mount Point
The entry point for accessing the file system. On a host that needs to access the file system, the mount operation can be completed by executing the mount command using the IP provided by the mount point. The mount point is located within a VPC; by selecting a specified VPC when creating the mount point, hosts within that VPC are allowed to access the specified file system.
Mount Address
The IP address provided by the mount point for the mount operation. The mount command is executed on the host using this address.
Expansion
When the remaining capacity of the file system cannot meet the business availability requirements, the file system can be expanded. This operation has no impact on applications using the file system and does not require downtime or unmounting.
Mounting and Unmounting
The mount operation is an operation that mounts a UFS file system instance as a disk partition in the host by executing the mount command inside the host. Users can mount the file system to the specified directory mount point within the host.
The unmount operation is to separate a file system instance from the host. After unmounting, operations that occur in the previous directory mount point will not be reflected on the UFS file system.
Soft Quota
When the usage of the file system exceeds the purchased capacity, we allow the file system to have a certain proportion of additional capacity to handle ongoing I/O, preventing business write failures due to delayed expansion. The proportion of this additional space is 4% of the purchased capacity, with an upper limit of 1TB. It is strongly recommended that file storage users enable usage alerts for each file system instance and expand capacity in a timely manner.