os : redhat 6.3
i want to trace the scsi commands and find the io hot spot.
but when i use blktrace to trace gpfs.
for example, run 'dd ' command to write a file .
the trace info doesn't have 'dd ' process info.
the trace info is different from the one which is generated in normal file system.
Does anybody use blktrace in gpfs , or does gpfs support blktrace command?
thanks for any reply.