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Definition: A patrol read scans the system for possible physical disk drive
errors that could lead to drive failure, then takes action to correct the errors.
The goal is to protect data integrity by detecting physical drive failure
before the failure can damage data. IBM calls this
This option indicates the rate for patrol reads for physical drives connected to
the selected adapter. The patrol
dedicated to running a patrol
Tip: The corrective action depend on the virtual configuration and the type
of errors. It affects performance, the more iterations there are, the greater
the impact.
Cache Flush Interval: 4 (seconds) is the default
This controls the interval, in seconds, at which the contents of the onboard
data cache are flushed.
Spinup Drive Count: 2 is the default
This is the number of disks that are started (spun up) simultaneously. Other
disks are started after these disks have started (after waiting the number of
seconds indicated in Spinup Delay).
Spinup Delay: 12 (seconds) is the default
This controls the interval in seconds between spinup of physical disks
connected to the selected controller.
These two Spinup settings (drive count and delay) are important for
preventing a drain on the system's power supply that would occur if all disks
spin up at the same time.
StopOnError: Enabled is the default
When the controller encounters an error during boot-up, it stops if this setting
is enabled.
Stop CC On Error: No is the default
An error found in checking the consistency causes further checking to stop if
you enable this setting.
Maintain PD Fail History: Enabled is the default
If enabled, this option maintains the problem determination failure history.
Note: Disabling this setting is not recommended. Enabling the history is
important for recovering multiple disk failures.
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Planning, Installing, and Managing the IBM System x3950 M2
data scrubbing
rate
is the percentage of system resources
read
.
.
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