Background scrub process for finding and repairing errors of files with redundant copies.This results in larger write operations and faster write throughput) avoiding unnecessary seek optimizations, sending writes in clusters, even if they are from unrelated files. TRIM/Discard for reporting free blocks for reuse.Single and Dual Parity implementations (experimental, not production-ready).Compression (ZLIB, LZO, ZSTD), heuristics.Checksums on data and metadata (crc32c, xxhash, sha256, blake2b).Subvolumes (separate internal filesystem roots).Writable snapshots, read-only snapshots.2^64 byte = 16 EiB maximum file size (practical limit is 8 EiB due to Linux VFS).Filesystems need to scale in their ability to address and manage large storage, and also in their ability to detect, repair and tolerate errors in the data stored on disk.
Linux has a wealth of filesystems from which to choose, but we are facing a number of challenges with scaling to the large storage subsystems that are becoming common in today's data centers.
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