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    SubjectRe: Sharing SCSI disks
    Date
    Hi,

    > > Couldn't you just write data and call sync?
    >
    > No. One of the reasons is that the sync does not propagate
    > down. Devices with own caches have no way to get this information
    > and use it to flush their caches.
    >
    > Additionally you don't always want all and everything flushed.
    > Some pieces of data always need to be on disk, others can be written
    > delayed or even out of order. Those are patterns that you can't
    > implement without RAW devices.

    An intelligent I/O system could still fuck up your software, ie. SCSI
    disk set to "ulimited reorder" which is fine for filesystems but fatal
    for some other things.

    Ralf

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