measuring disk IO / throughput?

[Tomasz Chmielewski]

Does anyone have a handy script to measure disk IO / throughput?

I'm testing a filesystem, but it seems to me that something strange 
happens, and much more data than expected gets to the disk (i.e., 
writing 1 MB file is really 10 MB of data sent to the device).

I tried iostat-scsi.stp from the wiki, but it doesn't work for me (it 
doesn't work for PATA-over-SATA and USB block devices, does it?), and it 
doesn't report data volume.


Ideally, I'd like to see a script which outputs this kind of information 
for all or chosen disks:


Already in iostat-scsi.stp:

- blocks read
- blocks written
- blocks read/s
- blocks written/s


This is what I'm looking for (for all kinds of block devices, not just 
SCSI):

- kB read
- kB written
- kB read/s
- kB written/s


Would be nice to have:

- read requests
- write requests
- read requests/s
- write requests/s


Anyone?

-- 
Tomasz Chmielewski
http://wpkg.org