Hello Jim,

thank you.

summary:-

SADUMP treats last LOADPARM character as if it is a hexadecimal nibble.

1...      8   - reserved for IBM - do not use
.1..      4   - SADUMP will attempt re-ipl using stored DIAG member MVS() 
parameter values
..1.      2   - unassigned - do not use
...1      1   - unassigned - do not use

We will be coding "0" to ensure no auto re-ipl is attempted by SADUMP.
Our exercise is to speed up SADUMP capture. we will use loadparm  SNSYSC0.

For our general usage we will code a SYMBOL for the SADUMP ucb address, and use 
AUTOMATION script to identify the UCB address of the second volume in the 
sysres set based on our volume naming standards, use SYMUPDTE process to 
dynamically update the symbol value, then use SET DIAG command to update the 
SADUMP UCB address. This to be performed after every IPL.

Activities, such as TDMF relocation of SYSRES volumes will be managed by 
re-driving the AUTOMATION script.

Regards
Bruce Hewson

On Wed, 10 May 2017 14:35:09 -0400, Jim Mulder <[email protected]> wrote:

>  Currently, "2" will be treated the same as "0" or " " (blank).    There 
>is no reason
>why you should have specified "2", and a good reason not to - there is  a
>possibility that in some future release, we might assign some meaning to 
>"2".
>
>  Standalone dump treats this character as a hexadecimal digit 
>representing four option bits.  The first bit is an undocumented option 
>intended to be used only under my direction.  The second bit is what
>is documented for "4".  The third (corresponding to "2") and fourth bits 
>are 
>currently unused. 
>
>Jim Mulder z/OS Diagnosis, Design, Development, Test  IBM Corp. 
>Poughkeepsie NY

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