27993 (BLKSIZE) * 60 (BUFNO) * 5 (Parallel) = 8,397,900 KB = 8.2 MB
=> If the maximum size of virtual private storage below 16MB line is 8 MB, a job must abnormally terminate with S878-10.
1. DFSORT: Summary of Changes by Release
"A program that invokes DFSORT, ICETOOL or ICEGENER will now be able to exploit the High PerformanceFicon (zHPF) hardware. When zHPF is available, DFSORT SORT or MERGE applications will use BSAM forSORTIN, SORTOUT and OUTFIL data sets."
2. z/OS DFSMS Using Data Sets: Managing SAM Buffer Space
"If the system builds the buffer pool for a BSAM user, the buffer pool resides below the 16 MB line."
3. DFSORT development comment in CSP Case #TS002838843
"I confirmed this to DFSORT development. He said DFSORT use all the information it is available at run time. So, if a previous PGM/process ready the DCB for input with specific BUFNO, DFSORT OPEN the INPUT with that DCB. As a result, buffer pool is obtained using provided blocksize and bufno.(if zHPF is enabled)"
|Who would benefit from this IDEA?||HPU customers who enable zHPF.|
How should it work?
We have to add a new parameter to HPU so that we can choose the number of BUFNO with BSAM access for SORTIN.
We have some workaround like below, but it's inconvenient because we cannot maximize parallel degree and zHPF advantage. It prevents us from getting performance benefit especially for customers unloading tablespace having a considerable number of partitions.
|Priority Justification||It's expected that users with HPU, zHPF and z/OS V2.2 or higher will increase.|
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