Top Secret Recovery File Not Showing 100% Utilization In TSO Option 3.4

Products

• Top Secret
• Top Secret - LDAP

Issue/Introduction

Why are some of the Top Secret recovery files not using 100% of the file? Some of the recovery files have been more recently allocated than others. Some were allocated by blocks, others by cylinders.

For example, the Top Secret recovery file from TSO option 3.4 show:

Message         Volume Tracks % XT Device Dsorg Recfm Lrecl Blksz Created      Referred  Catalog 
tss.sysa.recfile vol001 300     100 1 3390     PS     FB       1280 1280 1996/10/11 2018/12/04 CATALOG.xxxxxxx 
tss.sysb.recfile vol002 60       100 1 3390     PS     FB       1280 1280 1996/02/16 2018/12/04 CATALOG.xxxxxxx 
tss.sysc.recfile vol003 300     15   1 3390     PS     FB       1280 1280 1996/10/11 2018/12/04 CATALOG.xxxxxxx 
tss.sysd.recfile vol004 300     25   1 3390     PS     FB       1280 1280 1996/10/11 2018/12/04 CATALOG.xxxxxxx 

Environment

z/os

Resolution

TSO option 3.4 is not an accurate measure of the recovery files as these files are wrap around files. As wraparound files, once they reach 100%, new records are written at the beginning of the file, overlaying the older records. The ones showing less than 100% have not wrapped yet.