(cross-posting)
FILEDATA=RECORD causes each record to be prefixed with a quasi-RDW.
Is that done by the kernel or the access method?  In either case,
if two processes allocate the same UNIX file witn FILEDATA=RECORD,
PATHOPTS=O_APPEND, will the PUTs appear atomic or might the RDWs
and bodies from the two processes appear intermixed?

-- gil

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