Installation guide

Software Operation Manual
80
4.8.3.1 Stagger Power on Control
Normally RAID system’s redundant power can supply enough power to spin up both
drives simultaneously. Using special HDDs that 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 staggered spin-up capabilities to boost reliability. Staggered 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.
RAID controller has included the option for customer to select the disk drives
sequentially stagger power up value. The values can be selected from 0.4ms to 6ms
per step which powers up one drive.
4.8.3.2 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.
4.8.3.3 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.
4.8.3.4 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.
4.8.3.5 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 spin-up 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 spin-up of devices. It is mainly for server/workstation environments
operating in multiple-drive configurations.