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Pinned topic how to use blktrace in gpfs?

‏2013-01-11T09:36:37Z |
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.