General Problems
What storage types are supported by CFS?
CFS currently supports only one storage type, which uses SSD media to store data.
What protocol types are supported by CFS?
CFS currently supports the widely used NFS 4.1 protocol, SMB/CIFS and NFS 4.0 versions under development, so stay tuned.
How many file systems can each user create?
Within the same region, each user can create up to 20 file systems.
How many mount targets can be created per file system?
Currently, there is no limit to the total number of mount targets that a file system can create. However, a subnet within a VPC can only create one mount target.
Can mount targets be accessed across availability zones?
Yes, as long as the address of the mount target and the access network are connected.
How do I back up CFS data?
Currently, the backup feature of CFS is under development. Before we provide the formal backup feature, you can use the data backup tool of a third-party for data backup.
What regions does CFS open?
You can check whether a region provides CFS service by switching regions in the console interface.
How does CFS guarantee data availability and reliability?
Each piece of data in CFS is stored redundantly to multiple copies, and each module has features such as load balancing and automatic failover to maximize the availability and reliability of the data.
How do I choose among BOS, CDS and CFS?
You can evaluate what type of storage to use based on your usage scenarios. Here are the main differences for the products:
| BOS | CDS | CFS | |
|---|---|---|---|
| Interface form | HTTP interface | Block device interface | Posix compatible interface |
| Random read and write | Nonsupport | Support | Support |
| Delay | Highest | Lowest | Above CDS, below BOS |
| Data reliability | Multiple copies, stored across multiple Availability Zones | Multiple copies, stored in a single Availability Zone | Multiple copies, stored in a single Availability Zone |
| Data consistency | Highly consistent | Highly consistent | Highly consistent |
| Maximum capacity | Unlimited | Tens of TB | Several PB |
| Simultaneous access capability of Client | Can be accessed by multiple clients simultaneously | Can not be accessed by multiple clients simultaneously | Can be accessed by multiple clients simultaneously |
| Client geographical restrictions | Can access public network and any regions | Virtual machines in the same Availability Zone | Virtual machines or containers in the same region |
| Main usage scenarios | Mass data distribution and backup, data analysis and data processing | Scenarios without data sharing such as virtual machine root disk and I/O intensive business (such as database) | Scenarios with data sharing such as data analysis, data processing and shared logs; work well with containers |