Product Limitations
Quota per account
The number of file system instances that can be created by a single account is limited to 100.
File system limitations
| Limitations | Limitations | Explanation |
|---|---|---|
| File system protocol support | POSIX | Currently only POSIX is supported during the public beta period |
| File system shrink capability | Not supported | UPFS shrink is not currently supported during the public beta period |
| Number of hosts the file system can mount | Unlimited | Support for multiple cloud hosts to mount a single file system |
| The maximum capacity of a single file system | 10 PiB | Please contact technical support if more space is required |
| The minimum capacity of a single file system | 6 TiB | Currently the minimum supported in the public beta period is a single file storage system of 6TiB |
| inode number in a single file system | 1 billion | The total number of files and folders that can be created in a single file system should not exceed 1 billion (approximately 4 million files are supported per 1000GiB) |
| Maximum number of files in a single directory | 100 million | A maximum of 100 million files are supported in a single directory |
| Maximum size of a single file | 128TiB | The maximum size of a single file is 128TiB |
| Access path length | 4096 bytes | The maximum length of an access path (such as: /a/b/c) is 4096 bytes |
| File name length | 255 bytes | A maximum file name length of 255 bytes is supported |
Operating system limitations
Since the UPFS file storage service relies on the services of the POSIX client, we strongly recommend that you upgrade your host to the recommended versions below. If you are unable to upgrade and encounter unresponsive operations, you will need to reboot the cloud host to recover.
| Distribution | Recommended System Version | Recommended Kernel |
|---|---|---|
| CentOS | 7.2 and above | 4.19.0-9.el7.ucloud.x86_64 and above |
| Ubuntu | 14.04 and above | 4.19.0-9.ucloud and above |
| Debian | 10.0 and above | 5.10.0-23-amd64 and above |
| Rocky | 8.5 and above | 4.18.0-348.12.2.el8_5.x86_64 and above |
| RedHat | 7.6 and above | 3.10.0-957.el7.x86_64 and above |
Mounting Restrictions
Please make sure that the configuration of the cloud host you are mounting has a minimum CPU of 2 cores and 8g of memory.
Billing Policy
On-demand use is not supported, you can only use file storage by purchasing capacity in advance.