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WEB BROWSER-BASED CONFIGURATION
necessary tracking mechanisms for outstanding and completed
portions of the workload. The RAID subsystem allows user
to choose the SATA Mode: SATA150, NCQ, SAT300,
NCQ.
• HDD Read Ahead Cache
Allow Read Ahead (Default: Enabled)—When Enabled, the
drive’s read ahead cache algorithm is used, providing maximum
performance under most circumstances.
• Stagger Power on
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. New 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.
Areca has supported the fixed value staggered power up function
in its previous version firmware. But from firmware version
1.39, 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 0.4ms to 6ms per step which
powers up one drive.
• HDD SMART Status Polling
An external RAID enclosure has the hardware monitor in the
dedicated backplane that can report HDD temperature status
to the controller. However, PCI cards do not use backplanes if
the drives are internal to the main server chassis. The type of
enclosure cannot report the HDD temperature to the controller.
Summary of Contents for ARC-5030 Series
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