Sorry for the somewhat garbled previous post. Sent off too early.

>confighfs -x 50c /u/

Right, use confighfs command before going the disruptive way.
I'd recommend to use the "megabyte" option instead of the "cylinder"
option: confighfs -x 50m ....

Note that you can also expand to HFS to another volume, if its
initial allocation attribute allow so: confighfs -xn 50m ...

Finally, confighfs is for HFS file systems only. zfsadmin command 
is for zFS file systems.

The only valid way to copy an HFS as a data set is DFDSS!


Finally, putting data into /u is not a good idea in the long term.
Its not "UNIX like". The /u directory (which corresponds to /home
on other UNIX systems) is intended to be the anchor point for the 
user home directories. As soon as you get a couple of users you 
might want to take advantage of the automount faciility. Doing so 
would inhibit any user data in /u.

Only the system administrator should have write authority to the
/u directory, so its mode should be 755.

Even if you are the single person using UNIX on z/OS, I'd suggest
you create a home directoy for you (usually named after your 
userid) in the /u and work with this. Then create a unique
file system for you and mount in on that directory /u/userid.

Should you ever need to do something with your file system that 
need it to be unmounted, only you are affected by this disruption.
See the z/OS UNIX System Services Planning and User's Guide book
for more on the intended setup.

-- 
Peter Hunkeler
Credit Suisse

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