DTrace Enhancement

Static Defined Tracing (sdt) probes added to the SAM-QFS DTrace feature enable you to obtain information that cannot be obtained from the existing Function Boundary Tracing (fbt) probes. You can use the sdt probes to obtain information about individual file activity that can be used for debugging or for performance measurement.

The following sdt probes have been added to the SAM-QFS DTrace feature:

• sdt:samfs::sam-open-ret

• sdt:samfs::sam-close-ret

• sdt:samfs::sam-read-ent

• sdt:samfs::sam-read-ret

• sdt:samfs::sam-write-ent

• sdt:samfs::sam-write-ret

• sdt:samfs::sam-syscall-ent

• sdt:samfs::sam-syscall-ret

• sdt:samfs::sam-msgread-client

• sdt:samfs::sam-msgread-server

• sdt:samfs::sam-lookup-name

• sdt:samfs::sam-find-component

For more information about the new probes and for examples of scripts that show how to use them, see sam_dtrace(5) in Sun QFS and Sun Storage Archive Manager 5.3 Reference Manual.

The two examples, ino_mon and fs_mon, in the /opt/SUNWsamfs/examples/dtrace file show how to use the DTrace probes.