(IBM Mainframe Discussion List) wrote:
In a message dated 9/13/2007 5:59:21 A.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
1-3 extents occupy one VTOC block, next extents if available
occupy another VTOC block. In other words 100+ extents dataset occupy
the same VTOC space as 4 extent dataset.
This is not totally correct. The first 3 extents occupy the Format 1 DSCB
(Data Set Control Block), which must be defined in the VTOC for every new data
set. Each successive set of 13 extents occupy one more VTOC block called
the Format 3 DSCB. Thus 100 extents would require 9 DSCBs (the ninth one would
only contain information on the last 6 extents). This assumes that any
possible extent consolidation has already occurred as each new extent is
allocated.
I was told that Format 3 DSCB is for extents 3-16 *in case* of 16-extent
datasets and for 3-123 for "modern" (PDSE, ext-PS, HFS, VSAM) datasets.
I haven't check it in documentation, so I'm not sure of that.
--
Radoslaw Skorupka
Lodz, Poland
--
BRE Bank SA
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Wedug stanu na dzie 01.01.2007 r. kapita zakadowy BRE Banku SA (w caoci
opacony) wynosi 118.064.140 z. W zwizku z realizacj warunkowego
podwyszenia kapitau zakadowego, na podstawie uchwa XVI WZ z dnia 21.05.2003
r., kapita zakadowy BRE Banku SA moe ulec podwyszeniu do kwoty 118.760.528
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