Object Storage Service:ossfs 2.0 release history

Version information

Description

Release date

January 29, 2026

Download links

Alibaba Cloud Linux/CentOS (x86_64): ossfs2_2.0.6_linux_x86_64.rpm

Ubuntu/Debian (x86_64): ossfs2_2.0.6_linux_x86_64.deb

Alibaba Cloud Linux 3 (aarch64): ossfs2_2.0.6_linux_aarch64.rpm

Change log

New operating system support:

• Debian 11 and later versions.

Other changes:

• Reduced metadata memory usage by 10% to 20% in typical scenarios, depending on directory structure and file name length.

• Improved the data caching model. For open file handles, the latest object data from OSS is now readable even after the attr_timeout expires.

• Enhanced fstab-based automatic mount at startup to work on operating systems that lack the mount.fuse component.

• Additional stability enhancements and fixes.

Version information

Description

Release date

December 25, 2025

Download links

Alibaba Cloud Linux/CentOS (x86_64): ossfs2_2.0.5_linux_x86_64.rpm

Ubuntu (x86_64): ossfs2_2.0.5_linux_x86_64.deb

Alibaba Cloud Linux 3 (aarch64): ossfs2_2.0.5_linux_aarch64.rpm

Change log

New features:

• Added support for automatic mount on startup by configuring fstab.

• Added the --memory_data_cache_size mount option to enable memory cache mode. This mode reduces bandwidth amplification caused by concurrent reads of the same file. It significantly improves the efficiency of loading large models concurrently across multiple GPUs.

• Added the --max_inode_cache_count mount option to configure the number of global metadata caches.

• Added the --credential_process mount option to obtain access credentials from an external process.

Other changes:

• The --upload_buffer_size, --prefetch_chunk_size, --total_mem_limit, and --memory_data_cache_size options now support string-based configuration, such as `8m`, `8MiB`, `16g`, and `16GiB`.

• Optimized the system to reduce extra ListObjects requests caused by unexpected interruptions of readdir requests under high system load.

• Fixed other stability issues.

Version information

Description

Release date

October 27, 2025

Download links

Alibaba Cloud Linux/CentOS (x86_64): ossfs2_2.0.4_linux_x86_64.rpm

Ubuntu (x86_64): ossfs2_2.0.4_linux_x86_64.deb

Alibaba Cloud Linux 3 (aarch64): ossfs2_2.0.4_linux_aarch64.rpm

Change log

New operating systems and architectures:

• Added support for Alibaba Cloud Linux 3 on the ARM architecture.

Other changes:

• Fixed a potential program crash that could occur when system memory is critically low.

• Fixed an issue of excessive memory usage when many files are opened simultaneously.

Version information

Description

Release date

September 17, 2025

Download links

Alibaba Cloud Linux/CentOS: ossfs2_2.0.3_linux_x86_64.rpm

Ubuntu: ossfs2_2.0.3_linux_x86_64.deb

Change log

New features:

• Added ETag as a basis for checking if file content has changed.

Other changes:

• Added support for viewing mount option details using `ossfs2 mount --help`.

• Reduced memory overhead when running `ls` on large folders.

• Enhanced the `prefetch_chunks` mount option. You can now set it to -1 to disable the prefetch memory limit.

• Fixed other stability issues.

Version information

Description

Release date

July 16, 2025

Download links

Alibaba Cloud Linux/CentOS: ossfs2_2.0.2beta_linux_x86_64.rpm

Ubuntu: ossfs2_2.0.2beta_linux_x86_64.deb

Change log

New operating system support:

• Ubuntu 20.04, Ubuntu 22.04, and Ubuntu 24.04.

New features:

• Added the `--ram_role` mount option to support using an ECS RAM role as the OSS access credential.

• Added the `--oss_negative_cache_timeout` and `--oss_negative_cache_size` mount options. These options cache OSS requests that previously returned a 404 Not Found error to reduce subsequent duplicate requests.

Other changes:

• Fixed other stability issues.

Version information

Description

Release date

May 30, 2025

Download links

Alibaba Cloud Linux/CentOS: ossfs2_2.0.1beta_linux_x86_64.rpm

Change log

New operating system support:

• CentOS 7 and CentOS 8.

New features:

• Added support for configuring AccessKey ID and AccessKey Secret credentials using environment variables.

• Added the `uid`, `gid`, `file_mode`, and `dir_mode` mount options to specify globally consistent permission settings during mounting.

• Automatically sets the Multipurpose Internet Mail Extensions (MIME) type of OSS objects based on the file name extension when writing files.

Other changes:

• Optimized log content. For example, when an OSS request fails, the log now outputs the corresponding RequestID and EC error code.

• Added a default `total_mem_limit` parameter restriction on machines with 16 GB or less of system memory.

• Fixed other stability issues.

Version information

Description

Release date

March 25, 2025

Download links

Alibaba Cloud Linux: ossfs2_2.0.0beta_linux_x86_64.rpm

Change log

Initial release of ossfs 2.0.