When the working set of open files consumed more space than available space on the system, Rclone would not be able to continue to serve new IOs, even for read operations. When the full cache mode was developed for Rclone's 1.53 release, the condition of cache-space exhaustion (ENOSPC error) was not addressed. Each cache item is a sparse file inside a local directory tree (specified by -cache-dir VFS mount command) that mirrors the remote storage and contains ranges of the remote file that are being accessed or overwritten. In this mode, the cache that Rclone maintains has an item for each open file. The full cache mode provides the best-read performance through on-demand partial file caching and prefetching. Rclone mount supports several cache modes: off, minimal, writes, and full. The third problem is the lack of ability for resumable uploads with Rclone Chunker. The second problem is a performance issue during uploads with large file chunking with Rclone Chunker to remote backends like S3 cloud object storage that do not support fast renaming. The first is a problem in the Rclone mount cache management that did not allow the application’s working set to be bigger than the capacity of the Rclone cache, which would render Rclone unusable in many data intensive applications. In this post, we’ve identified and addressed multiple Rclone issues related to these features to make using Rclone easier for anyone. IBM Cloud users can take advantage of Rclone features like mounting remote storage as a filesystem, file transfer, and large file chunking. IBM Cloud recommends Rclone to users to access IBM Cloud Object Storage (COS). The open-source command-line program Rclone enables users to easily sync and manage data on cloud storage and now supports over 40 cloud storage products as backends.
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