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max primary & secondary allocation for TRK

 
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i_at_forum

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Joined: 29 Dec 2005
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PostPosted: Thu Mar 06, 2008 2:35 pm    Post subject: max primary & secondary allocation for TRK
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Hi,
Can anyone kindly tell me what is the maximum allowed primary & secondary allocation for TRK.

Thanks for ur help !!!
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expat

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Joined: 14 Mar 2007
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PostPosted: Thu Mar 06, 2008 2:39 pm    Post subject:
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A dataset can not have more than 63356 tracks allocated in total.

How you allocate that depends entirely up to you, and of course your DASD architecture
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gcicchet

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PostPosted: Fri Mar 07, 2008 7:28 am    Post subject:
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Hi expat,
I can't agree with the 63356 tracks allocated in total, I can see on my system datasets well in excess of this figure.

Code:
- Enter "/" to select action                  Tracks %Used XT  Device 
-----------------------------------------------------------------------
 XXXX.XXXX.XXXXXXX                             189720  100  40  3390   


Primary space allocation cannot exceed 65535 TRKS .

Gerry
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expat

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PostPosted: Fri Mar 07, 2008 12:58 pm    Post subject:
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Oooooooooooooooooops, I think I meant to say per volume icon_redface.gif

Although, that may now be surpassed with later releases of z/OS ???
Will need to check up on that one if I get a chance.
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nevilh

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Joined: 01 Sep 2006
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PostPosted: Fri Mar 07, 2008 7:14 pm    Post subject:
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following is from single volume allocation
Tracks %Used XT Device
xxx.xxx.xxx.xxx 132435 81 18 3390
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gcicchet

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PostPosted: Sat Mar 08, 2008 5:36 am    Post subject:
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Hi,
yes it depends on the device type.

Code:
                ** Table of 3390 Device Characteristics **                     
                                                                               
        Device Model:    Model 1       Model 2       Model 3       Model 9     
             Density:     Single        Double        Triple         Mod 9     
                       ------------------------------------------------------ 
 Tracks per Cylinder:        15            15            15            15     
   Tracks per Device:    16,695        33,390        50,085       150,255     
Cylinders per Device:     1,113         2,226         3,339        10,017     
       Avg Seek Time:       9.5m         12.5m         15.0m         22.5m     
     Bytes per Track:    56,664        56,664        56,664        56,664     
  Bytes per Cylinder:   849,960       849,960       849,960       849,960     
    Bytes per Device:   946 Meg      1.89 Gig      2.84 Gig      8.51 Gig     
          Bytes/Unit:  3.78 Gig      7.57 Gig     11.34 Gig     68.11 Gig     
                                                                               
                Note: Gig=Gigabytes, Meg=Megabytes, m=milliseconds             


Gerry
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