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CYLINDERS PARAMETER while defining VSAM

 
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manoopatil

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Joined: 07 Dec 2003
Posts: 56
Location: Montreal

PostPosted: Wed Apr 02, 2008 12:19 am    Post subject: CYLINDERS PARAMETER while defining VSAM
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Hi,

Following is the way a VSAM is getting defined. Please note the 'CYLINDERS' parameter. In the subsequent step this VSAM will be loaded with the data which requires about 6000 cylinders for data component and 17 cylinders for the index.

My question : Is it advisible to update the CYLINDERS parameter for the Data and Index component for the VSAM defined below to improve the performance of the subsequent step which is adding the data worth 6000 cylinders to this VSAM? Thanks for your time.

DEFINE CLUSTER(NAME(NBCV.TEST.UCM) -
DATACLAS(EXTEND) -
INDEXED -
UNIQUE -
CONTROLINTERVALSIZE(4096) -
RECSZ(40,40) -
KEYS(28 0)) -
DATA(NAME(NBCV.TEST.UCM.DATA) -
CYLINDERS(200 200) -
VOLUMES(*,*,*,*,*,*,*,*,*,*,*,*,*,*) -
CISZ(8192)) -
INDEX(NAME(NBCV.TEST.UCM.INDEX) -
VOLUMES(*,*,*,*,*,*,*,*,*,*,*,*,*,*) -
CISZ(512) -
CYL(3 2))
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expat

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Joined: 14 Mar 2007
Posts: 8593
Location: Back in jolly old England

PostPosted: Wed Apr 02, 2008 11:38 am    Post subject:
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The ability to allocate 6000 cylinders depends on the device geometry and may also be affected if you are using extended format VSAM data striping in your SMS routines.

If you use 3390-3 which has about 3330 usable cylinders, then code, 3000 and use additional volumes
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