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6.8.3.1.
Stagger Power On Control
In a PC system with only one or two drives, the power can supply enough power to spin up both
drives simultaneously. But in systems with more than two drives, the startup current from
spinning up the drives all at once can overload the power supply, causing damage to the power
supply, disk drives and other system components. This damage can be avoided by allowing the
host to stagger the spin-up of the drives. The SAS/SATA drives have support stagger spin-up
capabilities to boost reliability. Stagger spin-up is a very useful feature for managing multiple
disk drives in a storage subsystem. It gives the host the ability to spin up the disk drives
sequentially or in groups, allowing the drives to come ready at the optimum time without
straining the system power supply. Staggering drive spin-up in a multiple drive environment also
avoids the extra cost of a power supply designed to meet short-term startup power demand as
well as steady state conditions.
The RAID controller has included the option for customer to select the disk drives sequentially
stagger power up value. The values can be selected from 0.4 to 6 seconds per step which
powers up one drive.
6.8.3.2.
Time to Hdd Low Power Idle
This option delivers lower power consumption by automatically unloading recording heads
during the setting idle time. The values can be selected "Disabled" or within the range 2 to 7
minutes.
6.8.3.3.
Time To Hdd Low RPM Mode
This function can automatically spin disks at lower RPM if there have not been used during the
setting idle time. The values can be selected "Disabled" or within the range 10 to 60 minutes.
6.8.3.4.
Time To Spin Down Idle HDD
This function can automatically spin down the drive if it hasn't been accessed for a certain
amount of time. This value is used by the drive to determine how long to wait (with no disk
activity, before turning off the spindle motor to save power). The values can be selected
"Disabled" or within the range 1 to 60 minutes.
6.8.3.5.
SATA Power Up In Standby
SATA Power Up In Standby (power management 2 mode, PM2) is a SATA disk drive
configuration which prevents the drive from automatic spinup when power is applied.
"Enabled" option allows the drive to be powered-up into the Standby power management state
to minimize inrush current at power-up and to allow the controller to sequence the spinup of
devices. It is mainly for server/workstation environments operating in multiple-drive
configurations.
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