Hi,

I am new to AIX and I am trying to look into a performance issue with an C-Isam based application that uses Asynchronous IO. I ran iostat -D to have a look at the disks and saw what seemed to be some big figures ocurring in the queues section such as waits in the service queue of 3.1 seconds and sqfull figures of up to 1000. The man page says that the sqfull is the number of times that a disk has refused to accept an IO request per second. The only documentation I can find is in the AIX 5.3 differences manual. I spoke to the people who support the system but they don't understand what these statistics mean and don't see these figures as a problem. Can anyone point me to some documentation that explains a little more about what these statistics are? and what is actually happening, in particular with the sqfull statistic?

Many thanks
Steve

Hi Steve, here is a good reference of what the iostat does since AIX 5.3.

Thanks

It's getting a little late here now but I've just had a quick scan and it looks interesting

Steve