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    SubjectRe: mdadm software raid + ext4, capped at ~350MiB/s limitation/bug?


    On Sun, 28 Feb 2010, Mike Snitzer wrote:

    > On Sun, Feb 28, 2010 at 4:45 AM, Justin Piszcz <jpiszcz@lucidpixels.com> wrote:

    [ .. ]

    >
    > How did you format the ext3 and ext4 filesystems?
    >
    > Did you use mkfs.ext[34] -E stride and stripe-width accordingly?
    > AFAIK even older versions of mkfs.xfs will probe for this info but
    > older mkfs.ext[34] won't (though new versions of mkfs.ext[34] will,
    > using the Linux "topology" info).

    Yes and it did not make any difference:
    http://lkml.org/lkml/2010/2/27/77

    Incase anyone else wants to try too, you can calculate by hand, or if you
    are in a hurry, I found this useful:
    http://busybox.net/~aldot/mkfs_stride.html

    I believe there is something fundamentally wrong with ext4 when performing
    large sequential I/O when writing, esp. after Ted's comments.

    Justin.



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