Proware DP-503-F4A3, Installation And User Manual

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DP-503-F4A3 RAID SUBSYSTEM
Installation and User Manual 61
Maximum SATA Mode Supported:
The 5 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, SATA300,
NCQ.
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 set the 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):
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, 50, and 60.
HDD SMART Status Polling:
The RAID subsystem can read HDD SMART information through this function. This function is
enabled by default.
Disk Write Cache Mode:
The RAID subsystem supports Disk Write Cache Mode options: Auto, Enabled, and Disabled. If the RAID
subsystem has BBM (battery backup module), selecting the Auto option will automatically enable Disk
Write Cache. On the other hand, if there is no BBM, the Auto option will disable Disk Write Cache.
Disk Capacity Truncation Mode:
The RAID subsystem use drive truncation so that drives from different vendors are more likely to
be able to be used as spares for each other. Drive truncation slightly decreases the usable
capacity of a drive that is used in redundant units. Options are:
Multiples Of 10G : If you have several 120GB drives from different vendors, chances are
that the capacity varies slightly. For example, one drive might be 121.1 GB, and the
other 120.4 GB. This drive truncation mode makes the 121.1 GB and 120.4 GB drives
same capacity as 120 GB so that one could replace the other.
Multiples Of 1G: If you have 120 GB drives from different vendors, chances are that the
capacity varies slightly. For example, one drive might be 121.1 GB, and the other 121.4
GB. This drive truncation mode makes the 121.1 GB and 121.4 GB drives same capacity
121 GB
so that one could replace the other.
No Truncation : The capacity of the disk drive is not truncated.