XtendLan XL-RAID-2123ISSA, Руководство пользователя

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USB and eSATA to SATA II RAID Subsystem
User Manual 63
JBOD/RAID Configuration
The RAID subsystem supports JBOD and RAID configuration.
Maximum SATA Mode Supported:
The 12 SATA drive channel can support up to SATA ll, which runs up to 300MB/s. NCQ is a
command protocol in Serial ATA that can only be implemented on native Serial ATA hard
drives. It allows multiple commands to be outstanding within a drive at the same time.
Drives that support NCQ have an internal queue where outstanding commands can be
dynamically rescheduled or re-ordered, along with the necessary tracking mechanisms for
outstanding and completed portions of the workload. RAID subsystem allows user to
choose the SATA Mode: SATA150, NCQ, SAT300, NCQ.
Host NCQ Mode Setting:
This option allows the users to s e l e c t t h e s u p p o r t e d Host NCQ Mode or to disable it.
Options are: ESB2/MACPro/SiliconImage, Marvell 6145, ICH, nVidia, and Disabled.
HDD Read Ahead Cache:
This option allows the users to disable the cache of the disk drives in the RAID
subsystem. In some HDD models, disabling the cache in the HDD is necessary to
prove the RAID subsystem functions correctly.
Volume Data Read Ahead:
This option allows the users to s e t t h e Volume Data Read Ahead function. Options
are: Normal, Aggressive, Conservative, and Disabled.
Stagger Power On Control:
This option allows the RAID subsystem’s power supply to power up in succession
each HDD in the RAID subsystem. In the past, all the HDDs on the RAID subsystem
are powered up altogether at the same time. This function allows the power
transfer time (lag time) from the last HDD to the next one be set within the range of
0.4 to 6.0 seconds.
Spin Down Idle HDD (Minutes): MAID Function
This option enables the hard drives to spin down after they become idle after a preset
period of time. Options are: Disabled, 1 (For Test), 3, 5, 10, 15, 20, 30, 40, and 60.
Empty HDD Slot LED:
Use this option to turn ON or OFF the LED of a slot with no HDD.
HDD SMART Status Polling:
The RAID subsystem can read HDD SMART information through this function. This
function is enabled by default.