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EXT4 Seeing Work To Speed Up Mount Times For Large File-Systems

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  • EXT4 Seeing Work To Speed Up Mount Times For Large File-Systems

    Phoronix: EXT4 Seeing Work To Speed Up Mount Times For Large File-Systems

    Patches are pending that can sharply speed-up mount times of large EXT4 file-systems...

    http://www.phoronix.com/scan.php?pag...er-Mount-Times

  • #2
    "mount process w/o the patch couldn't complete in half an hour (according to vmstat it would take ~10-11 hours). with the patch applied mount took ~20 seconds."
    Weird bug.

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    • #3
      Originally posted by StarterX4 View Post
      Weird bug.
      Or a clever trick. Like adding integer numbers from 1 to 100 by hand or just group them in pairs and get 50*101.

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      • #4
        How long for this improvement to be available?

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        • #5
          Originally posted by Azrael5 View Post
          How long for this improvement to be available?
          ask your own distro maintainers if they plan to backport this

          Otherwise it will be in the next kernel version, as usual.

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          • #6
            Is there much of a use case for 100+ TB arrays formatted in EXT4? Wouldn't most work loads of that size be ZFS or BTRFS?

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            • #7
              Originally posted by kylew77 View Post
              Is there much of a use case for 100+ TB arrays formatted in EXT4? Wouldn't most work loads of that size be ZFS or BTRFS?
              That's just 10x 10TB drives, and there is plenty of workloads on servers where you don't care about ZFS/btrfs, like for example for databases (that are CoW and checksummed already internally).

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              • #8
                I wonder how slow dm-slow is.

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                • #9
                  Originally posted by starshipeleven View Post
                  That's just 10x 10TB drives, and there is plenty of workloads on servers where you don't care about ZFS/btrfs, like for example for databases (that are CoW and checksummed already internally).
                  Thank you. One thing my IT education has been light on is data bases so I didn't know that databases are already checksummed.

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                  • #10
                    Originally posted by StarterX4 View Post
                    "mount process w/o the patch couldn't complete in half an hour (according to vmstat it would take ~10-11 hours). with the patch applied mount took ~20 seconds."
                    Weird bug.
                    i have a not that big XFS filesystem at work, with a very heavy file creation/deletion traffic. and unmounting it takes ~15 minutes - most likely to make sure journal is up to date.

                    so cases like these are not that uncommon, regardless of fs.

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