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    SubjectRe: [linux-lvm] Re: [PATCH] 2.5 version of device mapper submission
    On Tuesday 15 October 2002 09:52, Kevin Corry wrote:
    > Also, am I correct in assuming that for merge_bvec_fn() to work properly, a
    > driver's merge_bvec_fn() must also call the merge_bvec_fn() of the driver
    > below it? For example, lets say we have a DM linear device that maps to two
    > underlying devices (or in LVM-speak, a linear LV that spans two PVs), both
    > of which are MD RAID-1 devices. For a given large request, DM may decide
    > that it is fully contained within one of its two target devices, and allow
    > all the requested pages to be added to the bio. However, it also needs to
    > ask MD what its limits are for that request, or MD would still have to go
    > through the trouble to split up the bio after it has been submitted.

    This example actually should have been RAID-0 (striping), not RAID-1
    (mirroring). Sorry if this caused any confusion.

    Kevin Corry
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