USB/IEEE 1394-to-SATA II RAID Subsystem
User Manual
13
Concatenating (Large)
This mode is also named “Large”. In this mode,
the RAID controller will concatenate all of the hard
drives into a single hard drive with larger capacity.
For example, if three 500GB hard disks are
connected to the RAID subsystem in Large Mode,
user will get a single hard disk with capacity of
1,500GB.
If any one hard disk gets defective, information
stored in this LARGE RAID will become invalid.
Parity Protection (RAID 3 and RAID 5)
The XOR engine in the RAID controller
generates parity block. In RAID 3 mode,
parity block will be stored in the same hard
disk drive. In RAID 5 mode, parity block will
be spread over all of the different hard
drives.
The RAID controller will also make use of
the same size disk space in each hard disk
under RAID 3 / RAID 5 condition.
Failure in a hard disk will cause the RAID
controller to enter into degraded mode. Host
controller still could rear/write data thru the
RAID normally without knowing any defects.
Users have to replace the defective hard
disk. The RAID controller will then enter into
online-auto-rebuild mode automatically.
