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  • Remount sysfs to make its superblock rw: mount -o remount,rw /sys

    calendar Nov 9, 2026 · 6 min read · Linux Container NFS  ·
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    While testing Amazon EFS volumes in containers, I found that sequential reads in some runs were about 4 times slower than in others. EFS volumes are mounted with efs-utils, which turns mount -t efs into an NFSv4.1 mount through a local TLS proxy. In the slow runs, the NFS mount's read_ahead_kb was 128 instead of 15360. …


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Peng Zhang

Software Engineer

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