how to monitor disk performance as percentage on ubuntu

how to monitor disk performance as percentage(%) on ubuntu 11.04 ?

I can see how much cpu or memory use as % with some commandline.
But I can't see how much the disk uses its resource as percentage.

Thanks

 

Check out this command:

Code:

df -h

 

I don't want to see how much the disk is used as bytes.

I want to see how much the disk is busy as percentage.

How can I find out this ?

Thanks

 

May be hdparm command can help .

 

Code:

df -h

also shows you the usage in %.

 

But df shows how much a disk uses as byte, I don't want it.

I wish how much it uses its performance as percentage

 

Code:

mh1:~# df -h
Filesystem            Size  Used Avail [COLOR="Red"]Use%[/COLOR] Mounted on
simfs                  58G   31G   27G  [COLOR="Red"]54%[/COLOR] /
tmpfs                 998M     0  998M   [COLOR="Red"]0%[/COLOR] /lib/init/rw
mh1:~#

 

I think I was misunderstood.
I don't want how much the disk has freespace or its data capacity.
I don't mean disk storage capacity.
as you know a disk has some performance ( rpm, speed,cache etc..)
I wish to learn that how much does the disk use its performance as percent during the disk works.
is there a command for that ?

Thanks

 

Do you mean data transfer rates, I/O rates, etc.?

 

Yes nearly

I wonder, when will the disk be bottleneck as i/o rates, how much busy is the disk?