Lenovo ThinkServer RD240 Software User's Manual page 153

Table 4.2 Controller Properties Menu Options (Cont.)
Option
Rebuild Rate
BGI Rate
CC Rate
Reconstruction Rate
Controller BIOS
NCQ
Connector 1
Coercion Mode
S.M.A.R.T. Polling
Alarm Control
Patrol Read Rate
Cache Flush Interval
Spinup Drive Count
Description
Use this option to select the rebuild rate for drives connected to the selected
controller. The default is 30 percent. The rebuild rate is the percentage of
system resources dedicated to rebuilding a failed drive. The higher the
number, the more system resources devoted to a rebuild.
Use this option to select the amount of system resources dedicated to
background initialization of virtual drives connected to the selected
controller. The default is 30 percent.
Use this option to select the amount of system resources dedicated to
consistency checks of virtual drives connected to the selected controller.
The default is 30 percent.
Use this option to select the amount of system resources dedicated to
reconstruction of drives connected to the selected controller. The default is
30 percent.
Use this option to enable or disable the BIOS for the selected controller.
The default is Enabled. If the boot device is on the selected controller, the
BIOS must be enabled; otherwise, the BIOS should be disabled or it might
not be possible to use a boot device elsewhere.
Native Command Queuing (NCQ) gives an individual drive the ability to
optimize the order in which it executes the read and write commands.
The default is Enabled.
Identifies where the chain of enclosures is connected to the RAID controller.
Drive coercion is a tool for forcing drives of varying capacities to the same
size so they can be used in a drive group. The coercion mode options are
None, 128MB-way, and 1GB-way. The default is None.
Note: The number you choose depends on how much the drives from vari-
ous vendors vary in their actual
use the 1GB coercion mode option.
Use this option to determine how frequently the controller polls for drives
reporting a Predictive Drive Failure (S.M.A.R.T.: Self-Monitoring Analysis
and Reporting Technology error). The default is 300 seconds (5 minutes).
Select this option to enable, disable, or silence the onboard alarm tone
generator on the controller. The default is Disabled.
Use this option to select the rate for patrol reads for drives connected to the
selected controller. The default is 30 percent. The patrol read rate is the
percentage of system resources dedicated to running a patrol read.
See Section 5.5, "Patrol Read-Related Controller Properties"
information about patrol read.
Use this option to control the interval (in seconds) at which the contents of
the onboard data cache are flushed. The default is 4 seconds.
Use this option to control the number of drives that spin up simultaneously.
The default is 2 drives.
Viewing and Changing Device Properties
size. It is recommended that you
for additional
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