the output of sar with flag b

[rs6000er]

my oracle is running with raw device and the tridtional sar command can
not be used for it. the new sar in aix 5l has a new flag b which can
mornitor the block device (filesystem) I/O and raw character device
I/O.
i am wondering the sar output with flag b is correct or not.
11:01:49 bread/s lread/s %rcache bwrit/s lwrit/s %wcache pread/s
pwrit/s
11:01:54 0 0 0 0 0 0 47
9
11:01:59 0 0 0 0 0 0 336
50
11:02:04 0 0 0 0 0 0 308
21
11:02:09 0 0 0 0 0 0 352
24
11:02:14 0 0 0 0 0 0 368
54
11:02:19 0 0 0 0 0 0 518
101
11:02:24 0 0 0 0 0 0 457
97
11:02:29 0 0 0 0 0 0 372
52
11:02:34 0 0 0 0 0 0 408
45
11:02:39 0 0 0 0 0 0 442
49


Average 0 0 0 0 0 0 361
50


the whole bread/s lread/s %rcache bwrit/s lwrit/s %wcache clumes are
zero.