At eighty or ninety percent, your disk arms are not operating
efficiently and are slowing down your system.  Your processor is waiting
for data from the disks so it is not very active.  This is a pure
hardware problem.  Generally speaking, disk activity should not exceed
about forty percent for extended periods of time.

- If the data being accessed is all on one drive so that that drive is
very busy while the others are idle, then use the ASPBAL commands to
spread your data across all of your drives.  From your description, I
don't think that this is the case.

- Buy more drives.  If you add more drives (disk arms) and then use the
ASPBAL commands to spread your data, you will receive immediate benefit.
You need to get your disk activity to forty percent or lower and this is
the easiest way to do it.

- If the 720 is used for other purposes which also drive high disk
utilization, you could try to move some of those functions to another
machine.

Some more information might be helpful:

How many drives do you have and what kind of disk protection do you use?

What capacity are the drives?  4 GB, 8 GB, 17 GB?

Are the high activity levels spread fairly evenly across all of your
drives or is it concentrated on one or two drives?

When the 720 receives the data from the queue, I assume that it
initiates some business processing.  Is this a very intense process like
order entry?

Regards,
Andy Nolen-Parkhouse


> Subject: Remote Data queue Job
>
> My Client has following situation:
>
> one AS/400 model 720 as backend server to service 4 frontend AS/400
270
> with Data queue to transfer data from frontend to backend.
> The backend had 80~90% disk busy, but the CPU Utilization usage only
> 20~30% on peak time for data receiving from forntend.
> The situation drivened the system tempary hanged for interactive job.
When
> lower data transfer load, the system CPU utilization usage always 100%
and
> Disk busy also 80~90% for interactive job. So the lower data transfer
load
> is normal. Why heavy data transfer load from frontend drivened the
Disk IO
> Bound and downing the system throughput ? Which system job handle the
> receiving data queue data from another AS/400 ? How do I solve this
> condition ?
>
>
> Best Regards,
>
> Vengoal Chang 張純銀
> Technical Support
> Dimerco Data System Corporation

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