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Appendices
NRAID
Non-RAID. The capacities of all the drives are combined to
become one logical drive (no block striping). In other words, the
capacity of the logical drive is the total capacity of the physical
drives. NRAID does not provide data redundancy.
Parity
Parity checking is used to detect errors in binary-coded data. The
fact that all numbers have parity is commonly used in data
communications to ensure the validity of data. This is called parity
checking.
RAID
Redundant Arrays of Independent Disks (Originally “Redundant
Arrays of Inexpensive Disks”). The use of two or more disk drives
instead of one disk, which provides better disk performance, error
recovery, and fault tolerance, and includes interleaved storage
techniques and mirroring of important data. See 0.
RAID Agent
The RAIDWatch module that manages and monitors a RAID
controller and receives RAIDWatch Manager commands via the
RAID Agent.
RAID Agent comes embedded with RAID array firmware. RAID
Agent can also be manually installed onto a server that is directly-
attached with a RAID array and communicates with it using the in-
band protocols. See description of in-band.
RAIDWatch Manager
The RAIDWatch management software interface. It’s part of the
RAIDWatch software.
SAF-TE
SCSI Accessed Fault-Tolerant Enclosures – an evolving enclosure
monitoring device type used as a simple real-time check on the
go/no-go status of enclosure UPS, fans, and other items.
SAN
Storage Area Network – is a high-speed subnetwork of shared
storage devices. A storage device is a machine that contains
nothing but a disk or disks for storing data. A SAN's architecture
works in a way that makes all storage devices available to all
servers on a LAN or WAN. Because stored data does not reside
directly on the network’s servers, server power is utilized for
applications rather than for data passing.
Glossary App-9
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