Here is what I get on my system (PII 400 w/128M RAM, one user logged on and no
batch activity) with the following command:

	iostat -tp -o data 2

and DISK ACCOUNTING enabled (patch applied on a 2.2.5-15 kernel running RH6.0).
Lines beginning with '> ' represent the output of the iostat command retrieved
from the 'data' file.

* /dev/hda is my IDE UDMA 33 disk drive [hdisk0]
* /dev/hdb (/dev/cdrom) is my IDE CDROM (40x max), NOT mounted and accessed for
  the FIRST time (no data in cache) [hdisk1],
* /dev/hdc is my IDE ZIP 100 drive, NOT mounted and accessed for the FIRST time
  [hdisk2],
* /dev/hda1 and /dev/hda5 are two DOS partitions, NOT mounted and accessed for
  the FIRST time.


Script started on Sun Jul 25 11:39:25 1999
> Time: 11:39:49  
> avg-cpu:  %user   %nice    %sys   %idle
>            1.89    0.00    0.71   97.40
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     2.64        12.57         1.96      92278      14454
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2     0.04         0.05         0.00        400          6
> hdisk3     0.00         0.00         0.00          0          0

root@brooks:~# dd if=/dev/hda5 of=/dev/null bs=1k count=4096
4096+0 records in
4096+0 records out
> Time: 11:40:31  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.50    0.00    5.50   94.00
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0   415.50      2048.00         6.00       4096         12
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2     0.00         0.00         0.00          0          0
> hdisk3     0.00         0.00         0.00          0          0

root@brooks:~# dd if=/dev/hda1 of=/dev/null bs=4k count=4096
4096+0 records in
4096+0 records out
> Time: 11:41:03  
> avg-cpu:  %user   %nice    %sys   %idle
>            1.50    0.00   16.00   82.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0  1001.00      7982.50         5.00      15965         10
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2     0.00         0.00         0.00          0          0
> hdisk3     0.00         0.00         0.00          0          0
>
> Time: 11:41:05  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.50    0.00    0.50   99.00
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0    28.00       213.50         0.00        427          0
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2     0.00         0.00         0.00          0          0
> hdisk3     0.00         0.00         0.00          0          0

root@brooks:~# dd if=/dev/cdrom of=/dev/null bs=1k count=2048
2048+0 records in
2048+0 records out
> Time: 11:41:49  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.50   99.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     3.50        15.00         0.00         30          0
> hdisk1     0.50         0.50         0.00          1          0
> hdisk2     0.00         0.00         0.00          0          0
> hdisk3     0.00         0.00         0.00          0          0
>
> Time: 11:41:51  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    1.00   99.00
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     1.50         0.50         1.00          1          2
> hdisk1   151.00       453.00         0.00        906          0
> hdisk2     0.00         0.00         0.00          0          0
> hdisk3     0.00         0.00         0.00          0          0
>
> Time: 11:41:53  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.50    0.00    0.50   99.00
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     0.00         0.00         0.00          0          0
> hdisk1   190.50       572.00         0.00       1144          0
> hdisk2     0.00         0.00         0.00          0          0
> hdisk3     0.00         0.00         0.00          0          0

root@brooks:~# dd if=/dev/hdc of=/dev/null bs=1k count=4096
4096+0 records in
4096+0 records out
> Time: 11:42:21  
> avg-cpu:  %user   %nice    %sys   %idle
>            1.00    0.00    0.50   98.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     5.00         2.00         3.00          4          6
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    14.00        52.50         0.00        105          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:23  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.00  100.00
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     0.00         0.00         0.00          0          0
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    47.50       190.00         0.00        380          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:25  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    1.50   98.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     0.00         0.00         0.00          0          0
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    48.00       190.00         0.00        380          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:27  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.50   99.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     0.00         0.00         0.00          0          0
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    47.50       190.50         0.00        381          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:29  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.50   99.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     0.00         0.00         0.00          0          0
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    47.00       189.00         0.00        378          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:31  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.50   99.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     3.00         0.00         3.50          0          7
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    48.50       193.00         0.00        386          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:33  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.50   99.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     0.00         0.00         0.00          0          0
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    47.50       190.00         0.00        380          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:35  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.50   99.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     0.00         0.00         0.00          0          0
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    48.00       190.50         0.00        381          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:37  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.50   99.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     2.50         0.00         2.50          0          5
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    47.50       190.50         0.00        381          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:39  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.50    0.00    0.50   99.00
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     0.00         0.00         0.00          0          0
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    46.50       185.50         0.00        371          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:41  
> avg-cpu:  %user   %nice    %sys   %idle
>           10.00    0.00    1.50   88.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     2.50         9.00         1.00         18          2
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    42.00       165.50         0.00        331          0
> hdisk3     0.00         0.00         0.00          0          0
> 
> Time: 11:42:43  
> avg-cpu:  %user   %nice    %sys   %idle
>            1.50    0.00    1.00   97.50
> Disks:      tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0     0.00         0.00         0.00          0          0
> hdisk1     0.00         0.00         0.00          0          0
> hdisk2    31.00       123.50         0.00        247          0
> hdisk3     0.00         0.00         0.00          0          0
Script done on Sun Jul 25 11:43:20 1999


--- Next test done on a 2.2.13 kernel running RH6.0 (accessing mounted
filesystems):

Script started on Sun Jan  2 11:26:50 2000
root@brooks:~# mount -t iso9660 /dev/hdb /cdrom
mount: block device /dev/hdb is write-protected, mounting read-only
root@brooks:~# cd /cdrom/kernel
root@brooks:/cdrom/kernel# ls -l linux-2.2.13.tar.gz
-r-xr-xr-x   1 root     root     15079540 Nov  3 10:15 linux-2.2.13.tar.gz
root@brooks:/cdrom/kernel# cp linux-2.2.13.tar.gz /tmp
root@brooks:/cdrom/kernel# cd /
root@brooks:/# umount /cdrom
> Time: 11:27:54  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.00  100.00
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0        0.00         0.00         0.00          0          0
> hdisk1        1.00         2.00         0.00          4          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:27:56  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.50    0.00    0.50   99.00
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0        0.50         0.00         0.50          0          1
> hdisk1        0.50         2.00         0.00          4          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:27:58  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.00  100.00
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0        0.00         0.00         0.00          0          0
> hdisk1        0.00         0.00         0.00          0          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:28:00  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    5.00   95.00
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0        0.00         0.00         0.00          0          0
> hdisk1       29.50      1826.00         0.00       3652          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:28:02  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    3.50   96.50
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0        0.00         0.00         0.00          0          0
> hdisk1       49.50      3168.00         0.00       6336          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:28:04  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00   21.00   79.00
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0        0.00         0.00         0.00          0          0
> hdisk1       37.50      2370.00         0.00       4740          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:28:06  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.00    0.00    0.50   99.50
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0       33.00         0.00      1647.50          0       3295
> hdisk1        0.00         0.00         0.00          0          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:28:08  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.50    0.00    0.00   99.50
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0        0.00         0.00         0.00          0          0
> hdisk1        0.00         0.00         0.00          0          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:28:10  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.50    0.00    1.00   98.50
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0       50.00         0.00      3100.00          0       6200
> hdisk1        0.00         0.00         0.00          0          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:28:12  
> avg-cpu:  %user   %nice    %sys   %idle
>            1.00    0.00    4.00   95.00
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0       42.00         0.00      2653.00          0       5306
> hdisk1        0.00         0.00         0.00          0          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0
> 
> Time: 11:28:14  
> avg-cpu:  %user   %nice    %sys   %idle
>            0.50    0.00    0.00   99.50
> Disks:         tps    Kb_read/s    Kb_wrtn/s    Kb_read    Kb_wrtn
> hdisk0        0.00         0.00         0.00          0          0
> hdisk1        0.00         0.00         0.00          0          0
> hdisk2        0.00         0.00         0.00          0          0
> hdisk3        0.00         0.00         0.00          0          0

