> ... I use ftp to transfer a dataset from z/OS to a distributed maschine ?
>The CP ? The SAP (the I/O processor) ?
Simplified view:
FTP code is running on the CP until it does a READ to read from the data set.
READ will eventually lead to SSCH to run the channel program. The SAP will take
over at that point. FTP code (actually READ) will go to sleep after the SSCH.
SAP will handle the I/O which eventually leads to an I/O interrupt when the
data is ready in the I/O buffer. A CP will process the I/O interrupt and wake
up the FTP code (which again runs aon a CP).
The FTP code will hand over data to TCP/IP which eventually will start an I/O
operation to transmit the data over the channel. All this runs on a CP until
TCP/IP (actually VTAM, I think) does a SSCH to start the I/O, gain handing over
to the SAP.
I this what you've been asking for?
--
Peter Hunkeler
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