Understanding of cloud storage solutions

Now all kinds of cloud disk, network disk, cloud storage. How do the clients of these disks transfer data to the storage behind the scenes? Ask for explanations
HTTP transmission is generally required to have client space to support the breakpoint continuation backend is generally an OSS object storage to achieve

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For the storage solution Das, for example, there are disks in the storage system, there are file system management disks, it is a complete system, in order to solve the data sharing and access.
and distributed File system is also to solve the problem of storage, sharing, in the Distributed file system, the data stored on many disks, the file system manages the entire storage space.
What is the difference between these two?

At the user level, both the storage scheme and the Distributed File system can provide a storage space, which is the same point;
From its internal contact, distributed file systems are networked devices that allocate their storage space to form a logically unified storage space
San Nas is a dedicated storage device (which can be understood as multiple hard drives combined with a huge hard disk) physical connection specialized devices provide dedicated storage from capacity speed, which can be physically considered a single device

Das Block Storage
File systems are based on block storage and are usually OS-related. For example, a USB drive or iSCSI disk is a block storage, but formatted as NTFS or EXT4 is a file storage ...

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How to use Hadoop to realize cloud-like storage of Baidu Cloud. Ask everyone to give a train of thought, concrete implementation details.
Build an HDFs cluster is, and then write a storage management system, responsible for user management, file management is almost. It's fast.

Understanding of cloud storage solutions