Thanks for all the suggestions.
I had a look at systemtap but I have the feeling that in it's current
state it is aimed more at kernel developers rather than average admins
like me :-)
Still, I'll keep an eye on it also give the fact that there seem to be
now new documentation being written about it
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/pdf/SystemTap_Beginners_Guide/SystemTap_Beginners_Guide.pdf
On the other end, I have discovered blktrace and related tools, and
this seems more palatable to me (subjective, I know ...). This example
in particular seems to work for me
# blktrace /dev/sda -a issue -a complete -w 60 -o - | blkiomon -I 4 -h -
thought to share in case anyone finds it useful.
cheers
A.
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