I have some volumes (Shark logical 3390) with VTOC Indexes that are full, or
very close to it.
If possible, I would like to expand the indexes without taking the volumes
offline or making them
unavailable. The problem is that the index, the VTOC, and the VVDS are all
adjacent (in that order, starting at CYL 0).
Are you certain that the VTOCIX is full? Generally the VTOCIX takes
only a fraction of the size of the active VTOC, so this would be true
only if you have a large VTOC with many datasets or VSAM components, and
a small VTOCIX. According to the numbers that IBM quotes (in an
appendix of the ICKDSF manual), the VTOCIX needs to be only about 5% of
the size of the VTOC, so a 5 track VTOCIX is adequate for 100 track VTOC.
Matt, since you have FDRABR, you can display the VTOCIX usage with
FDREPORT, something like
//VTOCIX EXEC PGM=FDREPORT,REGION=0M
//SYSPRINT DD SYSOUT=*
//ABRMAP DD SYSOUT=*
XS VOL=ABR*
REPORT FIELD=(VLVOLSER,VLDSCBU,VL%UDSCB,VL%UINDX)
PRINT DATATYPE=VOLDATA
this prints, for the select volumes, number of datasets, %VTOC in use,
%VTOCIX in use.
If they are truly full, the jobs that others have suggested can be used
to expand the VTOCIX without moving the VTOC. On today's control units,
there is no particular performance advantage to having the VTOCIX next
to the VTOC, only a space fragmentation advantage.
One note: if you are running OS/390 or z/OS less than 1.3, and these
volumes are online to more than one system, you need maintaince to allow
the BUILDIX in this environement. The MVS APAR is OW52855 (and its
related APARs) and there is a related ICKDSF APAR.
--
Bruce A. Black
Senior Software Developer for FDR
Innovation Data Processing 973-890-7300
personal: [EMAIL PROTECTED]
sales info: [EMAIL PROTECTED]
tech support: [EMAIL PROTECTED]
web: www.innovationdp.fdr.com
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