CA 1 Health check created the following alert
TMSH0121E One or more used DSNBs were found within the first 1,000
DSNBs in the free chain. Once the first of these used DSNBs has reached
the top of the free DSNB chain, any attempt to create a secondary file
will result in a 3YY-112 abend.
even if apparently no abend in batch activity due to tape usage and no chain errors in TMSPTRS.
Release : 14.0
Component : CA 1 Tape Management
TMSH0121E was a false alert due to high tape activity while the check was running.
Subsequent runs of the health check did no longer report an error and also TMSPTRS ended with RC=0.
PTF SO11630 is available to prevent these false alerts