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Tamanna
New User
Joined: 07 Oct 2006
Posts: 6
Location: Chennai
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Hi,
I take a back up of around 1500 datasets using ADRDSSU backup step into TAPE, which is consuming large CPU times. Are there any options to reduce the CPU consumption while using ADRDSSU step. |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8796
Location: Welsh Wales
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| What do you call large CPU times ? |
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Tamanna
New User
Joined: 07 Oct 2006
Posts: 6
Location: Chennai
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| By Large CPU times , i meant to say the TOTAL CPU TIME taken by the job |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8796
Location: Welsh Wales
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| Quote: |
| By Large CPU times , i meant to say the TOTAL CPU TIME taken by the job |
Yes, I rather gathered that, so I did mean for you to quote actual CPU consumption figures and the elapsed time too.
Have you considered the size of these 1,500 datasets.
Are they different HLQ's.
What paramteres have you specified in your DUMP job. |
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Tamanna
New User
Joined: 07 Oct 2006
Posts: 6
Location: Chennai
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Hi expat,
The backup job i was using takes the backup of all the PS and VSAM files i have created. Please find the jobs below( where TSTPS : corresponds to PS files HLQ and TSTTV corresponds to VSAM files HLQ)
//SB1PR02 EXEC PGM=ADRDSSU
//SYSPRINT DD SYSOUT=*
//SYSOUT DD SYSOUT=*
//TAPE1 DD DSN=TSTPS.ONSITE.D070501,
// DISP=(NEW,CATLG,DELETE),
// LABEL=RETPD=15,
// UNIT=TAPE3,
// VOL=(,,,15)
//SB1PR02.SYSIN DD *
DUMP OUTDD(TAPE1) -
TOL(ENQF) -
DS(INCL(TSTPS.** -
TSTTV.** ))
/*
Please find the CPU statistics below:
TOTAL CPU TIME= 3.71
TOTAL ELAPSED TIME= 183.95 |
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expat
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Joined: 14 Mar 2007
Posts: 8796
Location: Welsh Wales
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Doing a quick calculation, you are only using about 2% CPU during your job.
Do you really mean that the elapsed time is too long ?
I would try adding two parameters to your job
OPTIMIZE(4)
Which reads one cylinder at a time, and may help speed your job up.
SPHERE
Always advisable for VSAM datasets, as this includes any associated AIX and PATHs for the base cluster. However, this may in fact slow down your processing.
If you are lucky and have either a product called FAVER (CA ) or FDR ( Innovation Data Processing) installed, use those in preference to DFdss. These will far outperform Dfdss, But then again so would my grandmother 
FAVER is specifically for VSAM datasets and is a bloody marvellous product which offers so much flexibility and spped of processing.
FDR is a generic DASD backup/dump/restore tool, and once again goes much faster than DFdss. |
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HappySrinu
Active User
Joined: 22 Jan 2008
Posts: 194
Location: India
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Hi Expat,,
know it's very late reply but when searching about FDR i come across this post
We got FDR in our shop.
Can you provide me sample jcl, documentation on it to copy large number of datasets from one volume to another which doesn't have C link. |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8796
Location: Welsh Wales
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| HappySrinu wrote: |
Hi Expat,,
know it's very late reply but when searching about FDR i come across this post
We got FDR in our shop.
Can you provide me sample jcl, documentation on it to copy large number of datasets from one volume to another which doesn't have C link. |
No ...... I use DFdss here |
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gcicchet
Senior Member
Joined: 28 Jul 2006
Posts: 1702
Location: Australia
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Hi Tamanna,
can you tell how long from the time the job commenced executing to the time it accepted the tape, ie.it started writing to it.
It's very time consuming when masks/hlq are used to dump files.
Gerry |
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Pedro
Global Moderator
Joined: 01 Sep 2006
Posts: 2594
Location: Silicon Valley
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How much storage are you talking about? The number of datasets does not tell enough. If each one is very large, perhaps you are actually getting good performance. |
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Pedro
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Joined: 01 Sep 2006
Posts: 2594
Location: Silicon Valley
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Your JCL allows for 15 tapes. How many are actually used? If all are used, that is about 12 minutes per tape, including mounting and rewinding, which I think is fairly good. |
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Douglas Wilder
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Joined: 28 Nov 2006
Posts: 305
Location: Deerfield IL
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| The question was asked over a year ago. Do you think Tamanna is still waiting for the answer? |
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dick scherrer
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Joined: 23 Nov 2006
Posts: 19243
Location: Inside the Matrix
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Hello,
| Quote: |
| Do you think Tamanna is still waiting for the answer? |
No, this is a new-life-for-the-topic discussion with a bit of the traffic on the new question and some on the original 
I probably should have split this, but haven't yet. . . Just being slack. . . |
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