1 .TH fsrw.d 1m "$Date:: 2007-08-05 #$" "USER COMMANDS"
3 fsrw.d \- file system read/write event tracing. Uses DTrace.
7 This traces file related activity: system call reads and writes,
8 vnode logical read and writes (fop), and disk I/O. It can be used
9 to examine the behaviour of each I/O layer, from the syscall
10 interface to what the disk is doing. Behaviour such as read-ahead, and
11 max I/O size breakup can be observed.
13 Since this uses DTrace, only the root user or users with the
14 dtrace_kernel privilege can run this command.
18 unstable - this script uses fbt provider probes which may change for
19 future updates of the OS, invalidating this script. Please read
20 Docs/Notes/ALLfbt_notes.txt for further details about these fbt scripts.
23 Trace file system read/write events,
30 traced event (see EVENTS below)
42 offset of I/O in kilobytes
65 physical disk I/O, read ahead
68 Richard McDougall, Solaris Internals 2nd Ed, FS Chapter.
71 See the DTraceToolkit for further documentation under the
72 Docs directory. The DTraceToolkit docs may include full worked
73 examples with verbose descriptions explaining the output.
75 fsrw.d will trace until Ctrl\-C is hit.
80 fspaging.d(1M), dtrace(1M)