After my questions in a couple fora went unanswered, I looked further
into NFS documentation:
z/OS Network File System Guide and Reference
SC26-7417-13
... File time stamps in UNIX format are part of the attributes required
by the NFS protocol for NFS client/server communication. ...
2. MVS maintains the PDSE member create/change time stamp (mtime) in the
PDSE AX cell. The Server uses a FileAccessMethodService (FAMS) call ...
A Google search for FAMS returns the NFS reference, a SHARE presentation, a RFE,
and several APARs.
Where is this thing documented? It should be useful.
Also, from the NFS Guide:
... The server uses the following main time stamp sources to generate
UNIX time stamps for MVS z/OS conventional (legacy) file systems:
DSCB (data set control block)
Master Catalog data set attribute extension (AX) cell
PDSE member attribute extension (AX) cell
ISPF member statistics
TOD (current time_of_day on the server side).
Rube Goldberg.
-- gil
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