Short version:  If you are z/OS JES2 1.7 or above, don't drain spool 
volumes.  APARs OA17249 and OA20195 (new, see "additional related symptoms" 
within the APAR text) describe problems which can occur if you $P a spool 
volume which is not known to be empty.  The below workaround is suggested.

Brian

On Mon, 5 Mar 2007 09:19:19 -0600, Brian Peterson wrote:

>There are problems in z/OS 1.7+ JES2 where SPOOL volumes can drain with
>valid occupied track groups still remaining.
>
>One of these problems is described by OA17249.  The fix for OA17249 only
>corrects jobs submitted AFTER the fix is applied.
>
>Another problem was just discovered (no APAR number yet).
>
>Both of these problems deal with issues related to something called
>the "SPOOL used mask".  This is an attribute of each job, and is incorrect
>due to reasons described in OA17249 and in the new APAR about to be
>created.  Because the mask is wrong, JES2 "thinks" spool volumes are empty
>when in fact they still contain parts of valid jobs.
>
>The bottom line is - do not $P spool volumes in JES2 1.7 or 1.8.  Instead,
>follow the below procedure:
>
>Step 1) $T SPOOL(volser),SYSAFF=-ANY
>  This will perform the same function of $P SPOOL(volser), but without
>  draining the spool volume.
>
>Step 2) Take note of the exact date / time of step 1.
>
>Step 3) Wait until every job with a RD-DATE / RD-TIME (from SDSF ST 
display)
>  which was submitted before Step 2's date / time has purged.  On my
>  system, this took several weeks.
>
>Step 4) Once it is known that no job exists on SPOOL which pre-dates the
>  date / time of Step 2, it is now safe to $P SPOOL(volser).
>
>Brian
>

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