USB Features
4.2 Serial ATA HDD
4.3. Four Working Mode
BIG
JBOD,RAID0/FAST,RAID1/SAFE
BIG
The FANTEC MR-35DUF provides the following Universal Serial Bus (USB)
features:
USB 1.0 and USB 2.0 specification compliance
For detailed information about USB technology, refer to the following
specifications online:
Universal Serial Bus Specification, Revision 1.1
Universal Serial Bus Specification, Revision 2.0
The USB Organization web site is http://www.usb.org/
Support Firewire 1394b (Firewire 800), backward compatible with 1394a
(Firewire 400).
Hardware acceleration for FastStart and small data block gives industry-leading
performance.
Populated with two Serial ATA (SATA) hard disk drives (HDDs), each unit can
manage as much as 2,000 gigabytes (i.e., 2 terabytes) of data, depending on the
capacity of the hard disk drives that are installed. By combining multiple units in a
daisy-chained hierarchy structure, you can increase the total storage capacity of
your system.
You can configure the FANTEC MR-35DUS2 to use any of the following Storage
Policies to map the appliance's physical hard drives to virtual drives that are
visible to the host computer. The virtual drives are called volumes in the GUI. The
host operating system treats each volume as if it were a single physical drive.
This virtualization allows you to overcome restrictions that are imposed by
physical hard drives, such as speed, storage capacity or data storage reliability.
The BIG storage policy concatenates a series of physical hard drives as a single
large volume; resulting in a seamless expansion of virtual volumes beyond the
physical limitations of singularly connected hard drives. SteelVine BIG storage
policy delivers maximum storage space without a single large capacity and costly
hard drive. Hard drive A and B are concatenated into a single virtual volume in the
Figure below with a storage capacity that is equal to the sum of each of the
physical hard drives A and B.
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，
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Firewire 1394a/b Features
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It is also possible to create a BIG volume using only a single hard disk drive
connected to Port 0, and then increase the storage capacity of the volume later by
adding another hard disk drive to Port 1 and pressing the Mode Change push-
button. The new disk blocks of Port 1 will be concatenated to the end of the disk
blocks of Port 0, and any data that is stored on the existing BIG volume will be
preserved. However, it is not possible to expand an existing BIG volume by
adding another hard disk drive to Port 0 and still preserve any existing data on
that volume.
The JBOD (Just a Bunch of Disks) storage policy enables each hard drive to be
seen separately as one drive. They will get a single driver letter if used with one
partition.
JBOD
FAST(RAID0)
The FAST storage policy distributes access across all hard disks, also called
striping (equivalent to RAID 0). FAST presents the best data speed but no data
redundancy. FAST storage policy accelerates hard disk operating speed by using
many disks in parallel. Hard drive data segments are written to different disks
simultaneously which increases performance while sacrificing data redundancy.
To implement the FAST storage policy, the Processor creates a single virtual
volume that is striped across both hard drives, with a storage capacity that is
equal to the sum of both hard disk drives.
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