The following is a demonstration of the hotspot.d script.
Here the script is run while a large file is copied from one filesystem
(cmdk0 102,0) to another (cmdk0 102,3). We can see the file mostly resided
around the 9000 to 10999 Mb range on the source disk (102,0), and was
copied to the 0 to 999 Mb range on the target disk (102,3).
# ./hotspot.d
Tracing... Hit Ctrl-C to end.
^C
Disk: cmdk0 Major,Minor: 102,3
value ------------- Distribution ------------- count
< 0 | 0
0 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 418
1000 | 0
Disk: cmdk0 Major,Minor: 102,0
value ------------- Distribution ------------- count
< 0 | 0
0 | 1
1000 | 5
2000 | 0
3000 | 0
4000 | 0
5000 | 0
6000 | 0
7000 | 0
8000 | 0
9000 |@@@@@ 171
10000 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1157
11000 | 0
|