ScaleXFS: Getting scalability of XFS back on the ring

• Maintainer : Dohyun Kim(dohyun4212)
• Contributor : Dohyun Kim, Kwangwon Min, Joontaek Oh, Youjip Won

ScaleXFS is the newly developed filesystem which addresses two primary causes for XFS scalability failures: Contention between in-memory logging and on-disk logging and Contention among the multiple concurrent in-memory loggings.

To mitigate or eliminate the contention, we have proposed the three key techniques: (i) double committed item list, (ii) per-core in-memory logging, (iii) strided space counting.

ScaleXFS is implemented based on XFS with minimal modification. Since the filesystem on-disk layout remains unchanged, it can mount the existing XFS partition.

Publication

• Dohyun Kim, Kwangwon Min, Joontaek Oh, and Youjip Won "ScaleXFS: Getting scalability of XFS back on the ring", in Proc. of USENIX Conference on File and Storage Technologies (FAST) 2022, Feb, 22-24, 2022

How to use ScaleXFS

Mount ScaleXFS (same with xfs)

    mount -t xfs /dev/sdb /mnt

Mount Options for ScaleXFS

    # Key Techniques
    # (i) Double commited item list
    # (ii) Per-core in-memory logging
    # (iii) Strided space counting (we recommand using 8 Kbyte stride length).

    [No option]: XFS + (i)
    -o lspercpu=0: XFS + (i) + (ii)
    -o lspercpu=[stride length]: XFS + (i) + (ii) + (iii)
    ex) -o lspercpu=8k: XFS + (i) + (ii) + (iii) with 8 Kbyte stride length