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    SubjectRe: [LFS/VM TOPIC] Stable pages while IO (was Wrong DIF guard tag on ext2 write)
    Boaz Harrosh, on 06/03/2010 08:09 PM wrote:
    > [Topic]
    > How to not let pages change while in IO
    >
    > [Abstract]
    > As seen in a long thread on the fsdvel scsi mailing lists. Lots of
    > people have headaches and sleep less nights because individual pages
    > can change while in IO and/or DMA. Though each one as slightly different
    > needs, the mechanics look to be the same.
    >
    > People that care:
    > - Mirror and RAID people that need on disk consistency.
    > - Network storage that wants data checksum.
    > - DIF/DIX people

    - Load balancing MPIO clusters, where out of order execution of
    overlapping write requests for the changed pages can introduce a data
    corruption, which makes using Linux with load balancing MPIO clusters
    unsafe.

    > - ...
    >
    > I for one know nothing of the subject but am a RAID person and would
    > like a solution that does not force me to copy the complete data load.
    >
    > Please lets get all the VM VFS and drivers people in one room and see
    > if we can have a Linux solution to this problem
    >
    > Boaz
    > --
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    >



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