Are you recording  SMF 19? IIRC this can greatly elongate the SMF dump process 
as the system goes to touch every online volume for each SMF dataset switch.

In your SMF dump job, add buffers, especially on the tape side. I am currently 
running with 50 and may increase it some more. 

The combination of the 2 techniques resulted in a cumulative 40% reduction in 
elapsed time.

Other things to look at include the CISIZE  of the MAN* datasets.

<snip>
We have noticed that our dumping for SMF MAN files are taking longer than 
usual.  We see in the job log that when message IEC205I is issued, which shows 
the total blocks written, that sometimes it takes as long as 15 minutes for 
message IEF234E K to occur.   Has anyone else encountered this or could explain 
to me why it takes 15 minutes for the IEF234E K message to occur?

We realize that we need to get to logger but unfortunately it hasn't happened 
yet.
</snip>
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