Model PDP Series 200 maxDPU4F Hardware Guide
Metso Automation
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278705
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6-2
Backup State Definition
The following backup states are used to decide which DPU will remain or assume
control:
1: Fully Healthy or Healthy Enough
Some IO_Errors below threshold
Active but can’t hear backup
Net A and/or Net B functional (outage of one for more than 5 minute persistence)
2: Some Errors: would rather not run
Net A and/or Net B functional (outage of one for more than 5 minutes)
IO Errors above threshold while some IO good
Pulse
Faults
Time
Errors
3: Serious Errors: will only run if necessary
Net A and Net B both non-functional
Database out of date
IOM_Diag_Errors
All IO Bad
4: Fatal Errors: cannot run regardless
The following table represents which DPU will be the Active DPU based on the
backup health state:
Currently Active DPU State
STATE 1
2
3
4
1 CUR_ACTIVE STANDBY STANDBY STANDBY
2 CUR_ACTIVE
CUR_ACTIVE STANDBY STANDBY
3 CUR_ACTIVE
CUR_ACTIVE
CUR_ACTIVE STANDBY
4 CUR_ACTIVE
CUR_ACTIVE
CUR_ACTIVE NEITHER
Summary of Contents for PDP 400 maxDPU4F Series
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