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Maximum limit for allocation of space to a sequential datase

 
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rajandhla

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Joined: 18 Oct 2005
Posts: 182
Location: Luton UK

PostPosted: Tue Dec 05, 2006 2:20 pm    Post subject: Maximum limit for allocation of space to a sequential datase
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Hi,

Can any one please let me know about how much the maximum space can be allocated toa dataset ?

Is it dependent on voulme or any constraint/limit for allocation space is there.

Interms of cylinders primary & secondary quantity.
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kgumraj

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Joined: 01 May 2006
Posts: 151
Location: Hyderabad

PostPosted: Tue Dec 05, 2006 7:14 pm    Post subject: Re: Maximum limit for allocation of space to a sequential da
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Hello,
There is no exactly the limit. it depends how the profile ID is prepared from the admin.

It is like this Space is money, The more you pay the more you get the space. It is like hard-disk in windows language any file can be as big as the hard-disk size.
FYI:In mainframes we call hard disk as DASD
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TizMe

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Joined: 05 Jan 2006
Posts: 72

PostPosted: Wed Dec 06, 2006 8:09 am    Post subject: Re: Maximum limit for allocation of space to a sequential da
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kgumraj wrote:
It is like hard-disk in windows language any file can be as big as the hard-disk size.


Except that mainframe can be bigger than 1 disk because they can be mult-volume dataset. icon_wink.gif
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TizMe

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Joined: 05 Jan 2006
Posts: 72

PostPosted: Wed Dec 06, 2006 8:21 am    Post subject:
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Maximum Size on One Volume

Many types of data sets are limited to 65 535 total tracks allocated on any one volume, and if a greater number of tracks is required, this attempt to create a data set will fail.

Data sets that are not limited to 65 535 total tracks allocated on any one volume are:
Large format sequential
Extended-format sequential
UNIX files
PDSE
VSAM

If a virtual input-output (VIO) data set is to be SMS managed, the VIO maximum size is 2 000 000 KB, as defined in the Storage Group VIO Maxsize parameter.

Maximum Number of Volumes

PDS and PDSE data sets are limited to one volume. All other DASD data sets are limited to 59 volumes. A data set on a VIO simulated device is limited to 65 535 tracks and is limited to one volume. Tape data sets are limited to 255 volumes.

Maximum VSAM Data Set Size

A VSAM data set is limited to 4 GB across all volumes unless Extended Addressability is specified in the SMS data class definition. System requirements restrict the number of volumes that can be used for one data set to 59.

Using extended addressability, the size limit for a VSAM data set is determined by either Control interval size multiplied by 4 GB or the volume size multiplied by 59.

A control interval size of 4 KB yields a maximum data set size of 16 TB, while a control interval size of 32 KB yields a maximum data set size of 128 TB. A control interval size of 4 KB is preferred by many applications for performance reasons. No increase in processing time is expected for extended format data sets that grow beyond 4 GB. To use extended addressability, the data set must be SMS-managed and defined as extended format.
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