EVA on AIX - How to monitor I/O per path

[Alexp_1]

Hi,

I need to know if it is possible to monitor disk i/o traffic on specific paths to EVA LUNs on AIX.

I have tried fcstat, but this only shows which HBA has the traffic. Because we are trying to set up load-balancing, I need to see exactly which path is being used at any given time.

Thanks in advance, Alex.

[Alexp_1]

Ok, a bit more googling turned up the -m (multipath) option for iostat.

so.. "iostat -m" gives multipath i/o stats, for all disks.
"iostat -m -l hdisk2 hdisk3... hdiskx" gives stats for only the named disks.

I used it in a command-line loop (kshell), to monitor i/o over a period, like this:
----------------
while :
do
iostat -m -l hdisk2 hdisk3
sleep 3
done

----------------

Exactly what I needed. Hopefully this will be useful for someone else here too.

Does this mean I can give myself some points now? :-)

Cheers, Alex.