Library /sys$common/syshlp/ctf$help.hlb START, /BLOCKS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /BLOCKS=n

 	Specifies the size, in blocks, of the trace file to which
 	trace records from the specified tracepoints are written.

 	If a trace file reaches its maximum size, a new version of the
 	trace file is created.

 	The default file size is 200 blocks. The minimum file size is
 	20 blocks.