The most common case where one might want to do this is when you have
made a full-volume disk-to-disk copy, including volser, with the idea of
then backing up the copy. But since DFDSS forces the copy off line
because of the duplicate volser, DFDSS then can't dump the volume.
FDR will allow you to dump an off-line volume. While this is an
"innovative" way to handle the above problem, it also strikes me as
potentially dangerous. Normally the reason one has a device off-line to
a system is to guarantee that the system is not using the device in any
way (e.g., so one can do disruptive changes to the device, or to
serialize use of a device by different systems).
DFDSS provides an alternative way of solving the disk-to-disk copy, tape
dump scenario: by specifying the appropriate option (DUMPCONDITIONING,
I believe), you can copy everything but the volser to the DASD target,
but then be able to generate a tape dump of the target volume that will
by default restore with the original volser (this used to require the
original volume to at least have a VVDS or an IXVTOC in order to recover
the original volser during the restore). Since the target DASD volume
retains its unique volser, it is able to remain online. DFDSS or other
utilities can easily do volume level access to the device at that point.
Because the target device volser will not agree with the volser in MVS
catalogs, normal dataset-level access to datasets on the target DASD
volume will be constrained; but that's not an issue if the point is to
create a volume-level dump on tape.
JCE
Kenneth R Barkhau wrote:
Hello -
Anyone aware of being able to use DFDSS to COPY Volumes that are OFFLINE?
I have looked but have not found anything yet to indicate that
support exists for doing that.
Thanks much in advance.
Ken
Kenneth R. Barkhau
--
Joel C. Ewing, Fort Smith, AR [EMAIL PROTECTED]
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