Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 153
Table 4.2, Controller Properties Menu Options Cont.
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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 various vendors vary in their actual size. It is recommended that you 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" for additional 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 4-77
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