Baoverlay: A block-accessible overlay file system for fast and efficient container storage

Y Sun, J Lei, S Shin, H Lu - Proceedings of the 11th ACM Symposium on …, 2020 - dl.acm.org
Proceedings of the 11th ACM Symposium on Cloud Computing, 2020dl.acm.org
Container storage commonly relies on overlay file systems to interpose read-only container
images upon backing file systems. While being transparent to and compatible with most
existing backing file systems, the overlay file-system approach imposes nontrivial I/O
overhead to containerized applications, especially for writes: To write a file originating from a
read-only container image, the whole file will be copied to a separate, writable storage layer,
resulting in long write latency and inefficient use of container storage. In this paper, we …
Container storage commonly relies on overlay file systems to interpose read-only container images upon backing file systems. While being transparent to and compatible with most existing backing file systems, the overlay file-system approach imposes nontrivial I/O overhead to containerized applications, especially for writes: To write a file originating from a read-only container image, the whole file will be copied to a separate, writable storage layer, resulting in long write latency and inefficient use of container storage. In this paper, we present BAOverlay, a lightweight, block-accessible overlay file system: Equipped with a new block-accessibility attribute, BAOverlay not only exploits the benefit of using an asynchronous copy-on-write mechanism for fast file updates but also enables a new file format for efficient use of container storage space. We have developed a prototype of BAOverlay upon Linux Ext4. Our evaluation with both micro-benchmarks and real-world applications demonstrates the effectiveness of BAOverlay with improved write performance and on-demand container storage usage.
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