IBM reported the VSAM access error as defect when their product uses the CNV, ASY of OPTCD option on RPL macro (Control interval access, Asynchronous access) to PUT/CHECK.
Does Librarian use the CNV, ASY of OPTCD option on RPL macro ?
z/OS(current and previous) has this defect as a potential error.
The CNV, ASY of OPTCD option on RPL macro is not used anywhere in the Librarian.
IBM repoted as follows,
About the phenomenon which the DBFUMIN0 of DEDB initialization utility is WAIT(SW16-0258). This is a defect of new logic of z/OS DFSMS VSAM.
A timing hall exists in the VSAM logic which this phenomenon occurrs. An interrupt occurs in the range of specific 2 commands.
This is a very rare problem to occur when a CPU resource is tight.
This may occur if you specify the CNV, ASY with the OPTCD of RPL, and issue the PUT/CHECK repeatedly from the program.
In addition, in the general VSAM application, it can not occur for a logical record level and synchronous processing.
This defect has the previous z/OS version, too.