iostat on a specific mount

[gurupot]

Hi,

While iostat give the r/s and w/s info on a device basis, I was looking for a similar info for a particular mount in that device. Is this possible. For example my df -h shows
/dev/mapper/vg00-lv_usr 5242880 472775 4770105 10% /usr

I would like to get the io information only for the /usr. How can I achieve this.

Pots.

[coopstah13]

i don't think its possible, i think it is only per device, you would have to monitor whatever devices are being used for the logical volume

[gurupot]

Thanks for the reply. However even on the iostat the # of r/s and w/s do not seem to be appropriate for the kind of testing I am doing. First of all I doing equal # of reads and writes but r/s show 1 or 2 most of the time and w/s shows very high #s like 800 or even 2000 but 0 most of the time. Can you explain what could be going on.

[Irithori]

Hmm,
atop with the kernel patches will give you IO per process, if that is any help?

I never went through the trouble of patching the kernel just for that,
as atop without kernel patches, but with a update time of 1 sec usually gives enough hints on what process needs what.

atop 1