Service time vs. Wait time

[Christof Schoeman]

Hi

Can anybody explain to me the difference between average service time and average wait time, as reported by collect?

Also, how does this relate to the active queue and the wait queue?

Hope you can help.

[Victor Semaska_3]

Did you look at the manpage for collect. In the 'Disk Section' it gives explanations of those fields.

Vic

[Christof Schoeman]

Thanks

Just to make sure I understand the man page correctly:

- When an I/O is issued (by whatever), it goes into the wait queue and the wait timer is started.
- When the I/O reaches the front of the wait queue, the wait timer is stopped, giving us our wait time.
- The I/O is then sent to disk, the service timer started and the I/O goes into the active queue.
- When the disk returns the result, the service timer is stopped, giving us our service time, and the I/O is taken off the active queue.

Does that sound right?

[Victor Semaska_3]

Christof,

That sounds right to me.

Vic