The number of devices on which Indexed VTOC function has been lost exceeds the current Warning threshold. On heavily used volumes with many datasets, an index to a VTOC may significantly improve I/O performance. System routines at times may disable a VTOC index, returning it to non-indexed format. Use the DSF BUILDIX command (see the IBM "Device Support Facilities Users Guide and Reference") to return to indexed format. If the problem persists, you may need to delete and rebuild the index using DSF.
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