HFS physical file system diagnostic information is normally maintained in a set of cyclical buffers in memory. However, it can also be recorded to a file with a component trace. When it is maintained in memory, a dump must be taken to capture the diagnostic information for debugging purposes.

• To start the HFS CTRACE from the console, enter:

  TRACE CT,8M,COMP=SYSSMS 
  R nn,JOBNAME=(OMVS),OPTIONS=(ENTRY,EXIT,EXITA,SPECIAL,CB,RRTN,COMP=(PFS)),END 

• Reproduce the problem in a system with minimal activity.
• Collect dump using console dump (seez/OS dump)
• To turn HFS CTRACE off, issue the following console command:

  TRACE CT,OFF,COMP=SYSSMS