Hi,
In our shop we are doing a DR procedure by using DFDSS with ZCOMP:
/DUMP001 EXEC PGM=ADRDSSU,REGION=0M,COND=(0,NE)
//SYSPRINT DD SYSOUT=*
//DISCO DD DISP=SHR,UNIT=3390,VOL=SER=xxxxxx
//N1 DD DSN=FLD0541.DUMPTEST.xxxxxx.ZCOMP,
// DISP=(,CATLG),LABEL=(001,SL),
// STORCLAS=SCVTS01B,MGMTCLAS=MCCPEXP,
// VOL=(,,,100),UNIT=VTSIBM
//SYSIN DD *
SET PATCH 0D = FF
SET PATCH 0E = 3C
SET PATCH 0F = 0A
DUMP IDD(DISCO) ODD(N1) OPT(4) ALLDATA(*) ALLEXCP WAIT(15,15) -
ZCOMP(REQ)
For the VOLSER Z24RPB (that is a zOS 2.4 resident volume) on Z14 we have the
following statistics:
01.23.14 JOB52973 ---- SATURDAY, 29 JAN 2022 ----
01.23.15 JOB52973 -JOBNAME STEPNAME PROCSTEP RC EXCP CPU SRB
CLOCK SERV PG PAGE SWAP VIO SWAPS STEPNO
09.36.58 JOB52973 -PSDRB110 DUMP138 00 25289 .11 .00
1.74 326K 0 0 0 0 0 139
690 //DUMP138 EXEC PGM=ADRDSSU,REGION=0M,COND=(0,NE)
691 //SYSPRINT DD SYSOUT=*
692 //DISCO DD DISP=SHR,UNIT=3390,VOL=SER=$FDEF3
693 //N1 DD DSN=DR.DUMP.D220128.T160624.Z24RPB,
// DISP=(,CATLG),LABEL=(001,SL),
// STORCLAS=SCVTS01B,MGMTCLAS=MCCPEXP,
// VOL=(,,,100),UNIT=VTSIBM
694 //SYSIN DD *
For the same volume executing the dump on Z15 we have:
01.23.24 JOB01194 ---- WEDNESDAY, 09 FEB 2022 ----
01.23.15 JOB52973 -JOBNAME STEPNAME PROCSTEP RC EXCP CPU SRB
CLOCK SERV PG PAGE SWAP VIO SWAPS STEPNO
06.32.25 JOB01194 -PSDRB112 DUMP139 00 24999 .19 .01
1.82 597K 0 0 0 0 0 140
695 //DUMP139 EXEC PGM=ADRDSSU,REGION=0M,COND=(0,NE)
696 //SYSPRINT DD SYSOUT=*
697 //DISCO DD DISP=SHR,UNIT=3390,VOL=SER=$FDEF1
698 //N1 DD DSN=DR.DUMP.D220208.T160612.Z24RPB,
// DISP=(,CATLG),LABEL=(001,SL),
// STORCLAS=SCVTS01B,MGMTCLAS=MCCPEXP,
// VOL=(,,,100),UNIT=VTSIBM
699 //SYSIN DD *
Comparing the two step (don't mind that the two steps are using a different
volser name as input: $FDEF3 and $FDEF1. This is the output of flashcopy and
the content is exactly the same: the resident volume Z24RPB)
Then on Z14 we use 0.11 minutes and on Z15 0.20 minutes for CPU+SRB it means
82% more CPU time consumption!
Anyone have an idea as to why such difference?
It is a big difference if you multiply this difference per more than 4000
devices!!!
Please take into account that IBM said:
In the official web page "Integrated Accelerator for zEnterprise Data
Compression (zEDC)" at
https://www.ibm.com/support/z-content-solutions/compression/
with the statement (right at the top of the page), directly contradicting your
measurements:
The Integrated Accelerator for zEDC, available with IBM(r) z15(tm) and LinuxONE
III, reduces the cost of storing, transporting and processing data. It replaces
the zEDC Express adapter with on-chip compression, providing
increased throughput and capacity: for the z15, up to 8 times faster
application elapsed time with no additional CPU time compared to a z14 with
zEDC Express for compression and decompression *
kind Regards
Renato
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