Backup performance issue.

[rob@xxxxxxxxx]

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I have a backup that uses the SAV command to save some Domino IFS files.
It should fit in a four hour window between 8pm and 12 midnight.  It uses
a 3590 tape drive.  Most nights it fits fine.  However on occasion it
takes too long and the next job that needs the tape drive aborts it.

I choose the following problem question:  How do I determine why the
backup takes longer on one night versus others?

I looked at the performance data, (iSeries nav, my connections, my400,
Configuration and service, Collection services, right click on collection,
Performance tools, performance data).
Charts:
Transaction count:  I don't think it ever exceeded 500
Transaction response time:  I don't think it ever exceeded 0.5sec.
Total CPU utilized:  I think it peaked at 10%
Interactive CPU:  I think it peaked at 0.37%
Batch cpu:  I think it peaked at 9%
High disk utilization:  peaked at 19%
Machine pool faults:  two spikes around 35, 2 around 20 and the rest below
that.
User pool faults:  stayed under 100
Exception CPU utilization:  Strange.  One peak at 80.  Two peaks at 70.
The rest all around 0.

I checked out SST tape statistics and noticed no temp read or write
errors.

Rob Berendt
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