Recovery file not utilizing 100%

Document ID : KB000123994
Last Modified Date : 29/01/2019
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Introduction:
Why are some of our recover files are not using 100% of the file.
Question:
The question has come up as to why some of our recover files are not using 100% of the file.
There are 11 recovery files on our production system.
Some have been more recently allocated than others.
Some were allocated by blocks, some cylinders.
I can not find any real consistency to the differences.
Command - Enter "/" to select action Message Volume Tracks % XT Device Dsorg Recfm Lrecl Blksz Created Referred Catalog ------------------------------------------------------------------------------- TSS.FR.TS1A.TSRF XTSS08 300 100 1 3390 PS FB 1280 1280 1996/10/11 2018/12/04 CATALOG.VCT2U17 -------------------------------------------------------------------------------
TSS.FR.TS1B.TSRF XTSS05 60 100 1 3390 PS FB 1280 1280 1996/02/16 2018/12/04 CATALOG.VCT2U17 -------------------------------------------------------------------------------
TSS.FR.TS1C.TSRF XTSS13 300 100 1 3390 PS FB 1280 1280 1996/10/11 2018/12/04 CATALOG.VCT2U17 ----------------------------------------------------------------------
TSS.FR.TS1D.TSRF XTSS06 300 100 1 3390 PS FB 1280 1280 1996/10/11 2018/12/04 CATALOG.VCT2U17 ----------------------------------------------------------------------
TSS.FR.TS1E.TSRF XTS2P1 433 10 1 3390 PS FB 1280 1280 2010/11/30 2018/12/04 CATALOG.VCT2U17 ---------------------------------------------------------------------
TSS.FR.TS1F.TSRF XTS6P1 300 15 1 3390 PS FB 1280 1280 2017/04/13 2018/12/03 CATALOG.VCT2U17 ---------------------------------------------------------------------
TSS.FR.TS1G.TSRF XTS7P1 300 15 1 3390 PS FB 1280 1280 2017/04/14 2018/12/03 CATALOG.VCT2U17 ---------------------------------------------------------------------
TSS.FR.TS1H.TSRF XTS3P1 300 15 1 3390 PS FB 1280 1280 2017/04/13 2018/12/03 CATALOG.VCT2U17 ----------------------------------------------------------------------
TSS.FR.TS1I.TSRF XTSAP1 433 10 1 3390 PS FB 1280 1280 2017/05/11 2018/12/03 CATALOG.VCT2U17 ----------------------------------------------------------------------
TSS.FR.TS1J.TSRF XTSDP1 433 10 1 3390 PS FB 1280 1280 2017/05/11 2018/12/03 CATALOG.VCT2U17 ---------------------------------------------------------------------
TSS.FR.TS1K.TSRF XTSGP1 433 10 1 3390 PS FB 1280 1280 2017/05/11 2018/12/03 CATALOG.VCT2U17 
Environment:
z/os
Answer:
3.4 is not an accurate measure of these files as they are wrap around files. 
As wraparound files once they reach 100% they start at the beginning again.
3.4 might show 100% while actually it is only 5% used.
The ones showing 10 20 or 30 % etc have not been 100% written to.