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