System Control Blocks

FORMAT 6 -- SHARED EXTENT DATA SET CONTROL
BLOCR
The shared extent data set control block
(DSCB) is used for shared cylinder
allocation. It describes the extent of
space (one or more contiguous cylinders)
that are being shared by two or more data
sets. Up to 26 extents can be described in
one shared extent (format 6) DSCB.
Additional extents are described in other
format 6 DSCBs. The shared extent (format
6) DSCB is pointed to by the VTOC (format
4) DSCB. Figure 15F shows the format of
the shared extent (format 6) DSCB.
Descriptions of the fields follow the
illustration.
Format 6 (Shared Extent) DSCB 191