Areca ARC-1213-4I Manuel d'utilisateur télécharger pdf (Page 146)

WEB BROWSER-BASED CONFIGURATION

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• Write Performance Margin

The “Write Performance Margin” is for controller to reserve n%

write margin AV stream recording.

• Read And Discard Parity Data

This function is used to determine if parity data is to be read and

discarded.

6.8.3 HDD Power Management

Areca has automated the ability to manage HDD power based

on usage patterns. The “HDD Power Management” allows you to

choose a “Stagger Power On Control”, “Low Power Idle”, “Low

RPM” and completely “Spins Down Idle HDD”. It is designed to

reduce power consumption and heat generation on idle drives.

6.8.3.1 Stagger Power On Control

In a PC system with only one or two drives, the power can sup-

ply 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 sys-

tem 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 abil-

ity 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.

Areca 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.

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Areca ARC-1213-4I Manuel d'utilisateur Page 146