>>> On 10/3/2016 at 03:32 PM, "Jack J. Woehr" <[email protected]> wrote: 
> If this is actually supported, you should be able to do it from a USB stick 
> as well. In which case you could write
> a script that would download an ISO image, dd it out to the stick and boot 
> the z from the stick as from a DVD.

The "Load from Removable Media or Server" option on the HMC says "Hardware 
Management Console CD / DVD-ROM ."  The help for that page is, as usual, 
cryptic, but it seems to imply something else might be possible:
Examples
-snip-
2.  Relative Path: If the source is in the LINUX subdirectory, you can select 
Hardware Management Console CD / DVD-ROM and enter LINUX (or LINUX/) in the 
File location. (Note, the path name is case sensitive.)

I have _no_ idea what "the LINUX subdirectory" is, nor where it's located.  
It's possible it's something that came along with the z13[s] system.  I say 
that because there is also help topics for "Hardware Management Console USB 
flash memory drive" and "Hardware Management Console USB flash memory drive and 
assign for operating system use."

So, it could be entirely possible that you can indeed boot from and install 
from the USB port in the HMC on a z13.


Mark Post

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