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Chapter 1 Introduction
The AA-3102RS is an Ultra-SCSI to Ultra-SCSI RAID controller
specifically designed to provide RAID 0, 1, 3 or 5 capability to any host
system equipped with a SCSI interface. It is totally independent of the
host system's operating system. All RAID functions are performed by
a 486 CPU coupled with high-speed DRAMs and firmware in the
Flash Memory. In effect, it endows the host system with a high speed
and fault-tolerant disk storage operation using the RAID technology. It
is an ideal solution for weaving several hard disks into one contiguous
volume.
The controller has comprehensive drive failure management that
allows automatic reassignment of reserved blocks when a bad sector
is encountered during a write. Hot-swapping is supported through
automatic disconnection of a failed drive and detection of a reserved
drive followed with background rebuilding of data. The controller also
supports spare drive operation. What's remarkable is all these failure
recovery procedures are transparent to the host system.
The controller has been designed with ease of integration and
maintenance in mind. All major features are described in the next
chapter. The AA-3102RS already includes all the major operational
requirements of a RAID subsystem. The overall features of a fully-
built RAID subsystem will, however, depend on the actual components
used and the creativity of the integrator.
Chapter 1 Introduction
1
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