freeStor Xpand 1500C User’s Manual
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3.8.6 Maximum SATA Mode Supported
Within the freeStor Xpand 1500C, the Ultra 320 SCSI chip acts as a target and 15 SATA buses
are connected to the drive. The 15 SATA drive channel can run up to SATA II 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 by most manufacturers. It allows multiple commands to be queued 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. The disk array allows you
to choose between the following SATA Modes: SATA150, NCQ, SATA300,
NCQ.
To set or change the RAID subsystem maximum ATA mode, press the <up> and <down> arrows
to select the Maximum ATA Mode and then press <Enter> to accept the selection. When the
maximum ATA mode selection screen is displayed, use the <up> and <down> arrows to set the
maximum ATA mode. After completing the modification, the confirmation screen will be
displayed. Press <Enter> to accept your selection.
3.8.7 Disk Capacity Truncation Mode
The freeStor Xpand 1500C uses 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.
The controller provides three truncation modes in the system configuration: Multiples Of 10G,
Multiples Of 1G, and No Truncation.
Multiples Of 10G:
If you have 120 GB drives from different vendors, chances are that the
capacity varies slightly. For example, one drive might be 123.5 GB, and the other 120 GB.
Multiples Of 10G uses the same capacity for both of these drives so that one could replace the
other.
Multiples Of 1G:
If you have 123 GB drives from different vendors, chances are that the
capacity varies slightly. For example, one drive might be 123.5 GB, and the other 123.4 GB.
Multiples Of 1G uses the same capacity for both of these drives so that one could replace the
other.
No Truncation:
The unit does not truncate the capacity.
3.8.8 Terminal Port Configuration
Change the settings used to connect to the serial interface of the freeStor Xpand 1500C.
Parity Value is fixed at None.
Handshaking value is fixed at None.
Baud rate values can be 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200.
Stop bits can be 1 or 2.
3.8.9 Update Firmware
You can update the firmware on the freeStor Xpand 1500C by selecting this option. Once you
select this option and press <Enter>, a window will appear asking for the updated firmware
(Figure 3-28).
