The cloud hard drive and cloud storage surface look very close to two cloud computing services, just like a pair of brothers. But in fact, they have fundamental differences in both application scenarios and design goals. If you want to say that they are brothers, it is also a distant cousin.
The cloud drive is a complete IAAS concept. It provides the most basic virtual bare hard drive, users have to install the file system themselves, control and process the data storage structure above. In terms of reliability, the cloud hard disk is equivalent to the RAID1 standard, and the performance of the analog hard disk is emphasized.
Cloud storage is a PAAS concept that provides a simple API (programming model and data model) to provide users with key/valuepair data storage services. The user does not know or need to know how the data is stored, and the cloud storage service is responsible for the "permanent" preservation of the data.
The cloud drive can be mounted to the cloud host and used like a physical hard disk.
Cloud storage is used to store files like a network disk.
A picture distinguishes between cloud storage and cloud hard drive
Technically, the cloud drive is a block data service, more like a super huge hard drive. In fact, a cloud drive is a feature that simulates a disk with a storage cluster. The cloud hard disk is fully compatible with the characteristics of a bare hard disk. Users can deploy the original data application on the cloud hard disk without any modification, such as building various file systems, building various databases, etc., thereby enjoying the cloud hard disk. The benefits of low maintenance, scalability, high availability, and high performance. The data storage unit of the cloud drive is a block with a fixed size.
The cloud storage stores data objects with clear business meaning. For example, a picture, a movie, a novel, and so on. Therefore, the storage unit of the cloud storage is a data object, and its size is as small as several bytes and as large as several tens of hundreds of G.
From the perspective of data access characteristics, cloud hard disk and cloud storage belong to two application areas.
Since the cloud drive emulates the characteristics of the hard disk, it provides fast response data access. The data access response of the cloud hard disk is mostly below the millisecond level, while the cloud storage provides the data access response time of several tens of milliseconds.
This determines that they have their own application areas. Cloud storage can be used to store data objects for business, while cloud storage is more suitable for providing storage support for data services such as databases. Both are complementary in the field of application.
In the access mode, an application (user) can directly obtain data services from the cloud storage. The use of cloud drives is an indirect way. It needs to be mounted to an operating system and then served to the application through a file system or a system such as a database.
A common question is: Can an application that requires data storage, such as a network disk, use a cloud disk instead of a cloud storage to store data objects? The answer is: yes, but not applicable.
As mentioned earlier, the cloud drive emulates the characteristics of the hard disk and provides millisecond-level data access response. The client of the network disk can mount a cloud hard disk and then access it through the file system. However, because of the low-speed, low-response Internet, the network disk simply cannot benefit from the advantages of the cloud drive. Hard disk mounting across the Internet is clearly not a reliable practice.
The advantage of the cloud hard disk is that it can be used directly as a device in a LAN environment, with excellent throughput and reliability. The focus of cloud storage is on providing responsiveness to the Internet and focusing on ensuring data reliability.
For pure data storage, cloud storage is a better choice for high-performance access and data processing cloud drives.
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