Monitoring Device Incidents (Device Trace) - Bull DPS 7000 Operator's Manual

GCOS 7 System Operator's Guide
6.6

Monitoring Device Incidents (Device Trace)

For each device in the configuration, a threshold value is declared at system
generation which defines the acceptable number of logged events on a given
device. When that threshold is reached, the message:
AV16 dvnm log-ev-pct % EVENTS (ev-nb/io-nb)
is displayed, giving the number of logged events over the number of input/output
operations (and the corresponding percentage).
If the threshold declared at generation proves to be unrealistic, the value can be
revised for a device class through the MODIFY_DEVICE_TRACE command. The
operator can ascertain the present value set for a device class (or all classes) by
using the DISPLAY_DEVICE_TRACE command, which also displays the number
of events detected so far for each device of the class (or all classes). The number of
events can be reset to zero by use of the MODIFY_ERROR_LOG command or by
use of the PRLOG utility.
It may also be appropriate at some time (with the help of the Service Center, for
instance) to use the START_DEVICE_TRACE command, which requests an
information message each time an event is detected. A TERMINATE_DEVICE_
TRACE command discontinues this activity.
The START_DEVICE_TRACE command causes the following message to be
displayed for the original I/O incident and for the last retry of the I/O operation.
AV17 dvnm IOCC = ioccvl EV = evvl PSB = psbvl DBS = dsbvl
The Device Trace commands are described in Chapter 8 Description of the
Operator Commands.
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