ABCs of z/OS System Programming Volume 3 - IBM Redbooks

3.22 Update VTOC after volume expansion
REFORMAT command must be used to rebuild the
VTOC and index structures after a volume has been
expanded - (Method used with V1R10)
The command updates portions of a previously
initialized volume
You can also enter ICKDSF commands with ISMF
If an index exists when you expand the VTOC, it must
be deleted and rebuilt to reflect the VTOC changes
Parameters for index total track size rebuild
EXTINDEX(n)
XINDEX(n)
Figure 3-23 Create a new VTOC after volume expansion
New VTOC after expansion
To prepare a volume for activity by initializing it, use the Device Support Facilities (ICKDSF)
utility to build the VTOC. You can create a VTOC index when initializing a volume by using
the ICKDSF INIT command and specifying the INDEX keyword.
To convert a non-indexed VTOC to an indexed VTOC, use the BUILDIX command with the
IXVTOC keyword. The reverse operation can be performed by using the BUILDIX command
and specifying the OSVTOC keyword.
Parameters for index rebuild
To refresh a volume VTOC and INDEX in its current format, use the ICKDSF command
REFORMAT with the RVTOC keyword. To optionally extend the VTOC and INDEX, use the
ICKDSF command REFORMAT with the EXTVTOC and EXTINDEX keywords.
Run REFORMAT NEWVTOC(cc,hh,n|ANY,n) to expand the VTOC. The new VTOC will be
allocated on the beginning location cc,hh with total size of n tracks. Overlay between the new
and old VTOC is not allowed. If cc,hh is omitted, ICKDSF will locate the new VTOC at the first
eligible location on the volume other than at the location of the old VTOC where free space
with n tracks is found. n must be greater than the old VTOC size. The volume must be offline
to use the NEWVTOC parameter.
Run REFORMAT EXTVTOC(n) where n is the total size of the new VTOC in tracks. There
must be free space available to allow for contiguous expansion of the VTOC. If there is no
Chapter 3. Extended access volumes 87