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    SubjectRe: [ANNOUNCE] util-linux-ng v2.17 (stable)
    On 2010-01-08, at 14:43, H. Peter Anvin wrote:
    > On 01/08/2010 01:33 AM, Karel Zak wrote:
    >> fdisk:
    >> - the fdisk command aligns newly created partitions to
    >> minimum_io_size
    >> boundary ("minimum_io_size" is physical sector size or stripe
    >> chunk
    >> size on RAIDs).
    >>
    >> - the fdisk command supports disks with alignment_offset now.
    >
    > I think we should align, by default, much more aggressively than
    > that --
    > because frequently we just don't know what the real physical alignment
    > is (think of flash media, which uses large erase blocks underneath.)
    > Windows aligns partitions 1 MB boundaries by default now -- I think
    > that's probably a reasonably good idea, at least for any disk that's
    > not
    > tiny, say 256 MB or less.

    I agree whole heartedly. We steer users very sharply away from using
    partitions at all, because on h/w RAID devices the 512-byte offset
    from fdisk completely kills RAID-5/6 performance.

    Making the default minimum alignment for DOS/GPT partitions makes a
    lot of sense, and LVM PEs should be on 1MB boundaries as well (I don't
    think that is the case today either).


    Cheers, Andreas
    --
    Andreas Dilger
    Sr. Staff Engineer, Lustre Group
    Sun Microsystems of Canada, Inc.



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