What Are the Differences Between SFS, OBS, and EVS?
Table 1 shows the comparison between SFS, OBS, and EVS.
| Dimension | SFS | OBS | EVS |
|---|---|---|---|
| Concept | SFS provides on-demand high-performance file storage, which can be shared by multiple cloud servers. SFS is similar to a remote directory for Linux OSs. | OBS provides massive, secure, reliable, and cost-effective data storage for users to store data of any type and size. | EVS provides scalable, high-performance, high-reliability, block storage that can be used to meet a wide variety of service requirements. EVS disks are like physical disks on PCs. |
| Data storage logic | Stores files. Data is sorted and displayed in files and folders. | Stores objects. Files are saved directly to OBS. The files automatically generate corresponding system metadata. You can also customize the metadata if needed. | Stores binary data and cannot directly store files. To store files, you need to format the disk with a file system first. |
| Access method | SFS file systems need to be mounted to ECSs or BMSs through the NFS protocol before they can be accessed. A network address must be specified or mapped to a local directory for access. | OBS buckets can be accessed through the Internet or Direct Connect. The bucket address must be specified for access, and transfer protocols HTTP and HTTPS are used. | EVS disks can only be used and accessed from applications after being attached to ECSs or BMSs and initialized. |
| Use cases | Media processing, file sharing, high-performance computing, and data backup NOTE: Mainly suitable for high-performance computing workloads like gene sequencing and image rendering that require high bandwidth for file sharing. | Big data analysis, static website hosting, online video on demand (VoD), gene sequencing, and intelligent video surveillance | High-performance computing, enterprise critical clustered applications, enterprise application systems, and development and testing NOTE: Mainly suitable for high-performance workloads like industrial design and energy exploration that require high speed and high IOPS for high-performance storage. |
| Capacity | EB-level | EB-level | TB-level |
| Latency | 10 ms | 10 ms | 1 ms |
| IOPS/TPS | Millions | Tens of millions | 33,000 per disk |
| Bandwidth | TB/s | TB/s | MB/s |
| Data sharing | Supported | Supported | Supported |
| Remote access | Supported | Supported | Not supported |
| Online editing | Supported | Not supported | Supported |
| Used independently | Supported | Supported | No (EVS disks can only be used after being attached to cloud servers, such as ECSs.) |
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