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Thread: Linux Kernel Gets Hot-Data Tracking

  1. #1
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    Jan 2007
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    Default Linux Kernel Gets Hot-Data Tracking

    Phoronix: Linux Kernel Gets Hot-Data Tracking

    Patches continue to be developed for the Linux kernel that provide hot-data tracking support for file-systems. This hot-data tracking feature may lead to performance improvements when dealing with commonly used data on the disk. Currently this feature has been developed with Btrfs in mind, but could be adapted to other Linux file-systems...

    http://www.phoronix.com/vr.php?view=MTIwMzY

  2. #2
    Join Date
    Sep 2007
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    51

    Post ZFS

    Finally something ZFS is having for 6+years in production on Solaris (Illumos and distributions, like Smartos, Nexenta, Openindiana)
    You add SSD's to speed up all disk operations for all disks in a pool.

    Oh yes, right,
    there is now FreeBSD and ZFSonLinux that works fine and is in-kernel ZFS you can use in Linux and it works in production.
    And many other things nobody heard before peeking to ZFS specifications that is still not cached up to.

  3. #3
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    Dec 2008
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    Default

    Time for another benchmark.

    Every so often Phoronix has benchmarked the various filesystems. In those comparisons, btrfs has always looked interesting, but it has also always preformed quite bad for one case or another. I'm still running ext4 for most of my usage, because while it may not be the best performer, it's always up there and hasn't had bad corners for some time now. (I also use xfs for my MythTV video.)

    Hot data tracking looks like another reason to be interested in btrfs.

  4. #4
    Join Date
    Aug 2012
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    70

    Default

    today in linux. it's possible to do this kind of data traking?
    I'm looking for this for a time.

  5. #5

    Default

    bcache already exists (though is not in mainline). It lets you assign an SSD as a cache device for an HDD (it actually works with any block device).

    http://bcache.evilpiepirate.org/

  6. #6
    Join Date
    Aug 2010
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    14

    Default

    Quote Originally Posted by Markore View Post
    Finally something ZFS is having for 6+years in production on Solaris (Illumos and distributions, like Smartos, Nexenta, Openindiana)
    You add SSD's to speed up all disk operations for all disks in a pool.

    Oh yes, right,
    there is now FreeBSD and ZFSonLinux that works fine and is in-kernel ZFS you can use in Linux and it works in production.
    And many other things nobody heard before peeking to ZFS specifications that is still not cached up to.
    I donīt think this is the same, ZFS has itīs ARC disks which keeps a copy of frequently accessed blocks, but the data also remains on your
    slow spinning disks at the sae time. My understanding of the hot tracking feature in Linux is that it can also be used to relocate hot blocks, like a true
    tiered storage solution. Thar would be really cool, especially if it is filesystem independent.
    I also use ZFS for a number of things, but itīs inability to modify existing Vdevs and inability to remove Vdevs from a pool is not very impressive, I
    think BRTFS will be a better choice in a year or two when it is feature complete.

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