Hi,
Sorry to hook in this late, I hope we are still in time.
This is something you never want to see !!
Especialy with internal disks. Please make sure you have the latest top-patch installed ! If so take a closer look as top is not realy a good advisor on systemload, but of cours should still be a bit more accurate.
WIO is Waiting for IO and means that your disks are so bussy that another request for IO had to be put into wait. Your system will take it of waiting after a while again and will retry in a moment.
WIO is slowing down your server a lot. This can be caused by swap as well (running out of memory).
Anyway, for a good check you should do the following :
sar -u 2 20 # This will tell you the actual cpu usage
sar -d 2 20 # If wio keeps high, check the disk and see which one it is
You'dd better check the disk if this is just a single disk. ES should replace the disk/fibre channel or whatever if it's realy staying at such a load.
Most of all a "format" --> specify the bussy disk --> analyze --> read , should come up with timout errors. keep a "tail -f /var/adm/messages" open !
I think this is more than enough food for you now
Let me know if I was in time, or if you need some extra help.
Regs David