Object Storage Service:ossfs 2.0 release history

Item

Description

Release date

August 17, 2026

Download links

Alibaba Cloud Linux/CentOS/Rocky Linux (x86_64): ossfs2_2.0.9_linux_x86_64.rpm

Ubuntu/Debian (x86_64): ossfs2_2.0.9_linux_x86_64.deb

Alibaba Cloud Linux 3 (aarch64): ossfs2_2.0.9_linux_aarch64.rpm

Change log

New features and optimizations:

• Added support for configuring a local temporary directory through the --temp_dir mount option to enable random write mode, which provides full POSIX write semantics.

• Optimized the disk cache read/write engine. Read performance is significantly improved in some scenarios:

  • psync: Initial read performance for sequential reads of large files is improved by 40%.

  • libaio: Cache-hit performance in concurrent small-file scenarios is improved by 45%.

Other changes:

• Stability enhancements and bug fixes related to the disk cache.

Item

Description

Release date

July 7, 2026

Download links

Alibaba Cloud Linux/CentOS/Rocky Linux (x86_64): ossfs2_2.0.8_linux_x86_64.rpm

Ubuntu/Debian (x86_64): ossfs2_2.0.8_linux_x86_64.deb

Alibaba Cloud Linux 3 (aarch64): ossfs2_2.0.8_linux_aarch64.rpm

Change log

New features and optimizations:

• Added support for enabling disk cache through the --disk_data_cache_dir and --disk_data_cache_size mount options.

• Added the --http_proxy mount option to specify the HTTP proxy server used to forward OSS requests.

• Optimized the bandwidth waste caused by concurrent reads of the same file through multiple handles in the default mode, which shortens the startup time when loading large models across multiple GPUs.

Other changes:

• Upgraded the third-party dependency PhotonLibOS to version 0.9.4.

• Displayed the bucket and endpoint of the mount point in the output of the mount command.

• Other stability enhancements and bug fixes.

Item

Description

Release date

April 9, 2026

Download links

Alibaba Cloud Linux/CentOS/Rocky Linux (x86_64): ossfs2_2.0.7_linux_x86_64.rpm

Ubuntu/Debian (x86_64): ossfs2_2.0.7_linux_x86_64.deb

Alibaba Cloud Linux 3 (aarch64): ossfs2_2.0.7_linux_aarch64.rpm

Change log

New operating system support:

• Rocky Linux 9.0 and later.

New features:

• Added the --kernel_readdir_cache_timeout mount option to enable the kernel directory cache.

Other changes:

• Upgraded the third-party dependency PhotonLibOS to version 0.9.

• Optimized the read/write memory pool. The pool now returns long-unused memory blocks to the operating system.

• Other stability enhancements and bug fixes.

Item

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.

Other changes:

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

• Improved the data caching model. Open file handles can now read the latest object data from OSS even after the attr_timeout period expires.

• Enhanced the automatic mount on startup feature via fstab, which now works on operating systems that lack the mount.fuse component.

• Other stability improvements and bug fixes.

Item

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 and 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 cache entries.

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

Other changes:

• The --upload_buffer_size, --prefetch_chunk_size, --total_mem_limit, and --memory_data_cache_size options now accept string values for size, such as 8m, 8MiB, 16g, and 16GiB.

• Fixed an issue where interrupted readdir requests caused extra ListObjects requests under high system load.

• Fixed other stability issues.

Item

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:

• Alibaba Cloud Linux 3 on the ARM architecture.

Other changes:

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

• Fixed excessive memory usage when a large number of files were opened simultaneously.

Item

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 support for using the ETag to detect file content changes.

Other changes:

• You can run the ossfs2 mount --help command to view the details of the mount options.

• Reduces memory overhead when using the ls command on a large directory.

• Enhanced the prefetch_chunks mount option to support a value of -1, which disables the prefetch memory limit.

• Miscellaneous stability fixes.

Version information

Description

Release date

July 16, 2025

Download URL

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 use an ECS RAM role as an Object Storage Service (OSS) access credential.

• Added the --oss_negative_cache_timeout and --oss_negative_cache_size mount options. These options cache OSS request entries 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 link

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:

• Supports configuring AccessKey ID (AK) and AccessKey Secret (SK) access credentials using environment variables.

• Adds the uid, gid, file_mode, and dir_mode mount options. These options let you specify globally consistent permission settings during mounting.

• Automatically sets the MIME type for OSS objects based on the file name extension when you write files.

Other changes:

• Optimizes log content. For example, when an OSS request fails, the corresponding RequestID and EC error code are now included in the output.

• Adds a default total_mem_limit parameter limit on machines with 16 GB or less of system memory.

• Fixes other stability issues.

Version information

Description

Release date

March 25, 2025

Download URL

Alibaba Cloud Linux: ossfs2_2.0.0beta_linux_x86_64.rpm

Change log

Initial release of ossfs 2.0.