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Glossary
4
controller module
A FRU that contains: a storage controller processor; a management
controller processor; out-of-band management interfaces; a LAN
subsystem; cache protected by a capacitor pack and Compact Flash
memory; host, expansion, and management ports; and midplane
connectivity. If a controller enclosure contains redundant controller
modules, the upper one is designated
A
and the lower one is designated
B
.
CPLD
Complex programmable logic device. A generic term for an integrated
circuit that can be programmed in a laboratory to perform complex
functions.
DAS
See
data host
A host that reads/writes data to the storage system. A data host can be
connected directly to the system (direct attached storage, or DAS) or
can be connected to an external switch that supports multiple data hosts
(storage area network, or SAN).
data mirroring
Data written to one disk drive is simultaneously written to another disk
drive. If one disk fails, the other disk can be used to run the virtual disk
and reconstruct the failed disk. The primary advantage of disk
mirroring is 100 percent data redundancy: since the disk is mirrored, it
does not matter if one of the disks fails; both disks contain the same
data at all times and either can act as the operational disk. The
disadvantage of disk mirroring is that it is expensive because each disk
in the virtual disk is duplicated. RAID 1 and 10 use mirroring.
data striping
The storing of sequential blocks of incoming data on all the different
disk drives in a virtual disk. This method of writing data increases
system throughput because multiple disks are working simultaneously,
retrieving and storing. RAID 0, 10, 3, 5 and 50 use striping.
DHCP
Dynamic Host Configuration Protocol.
direct attach storage
(DAS)
A dedicated storage device that connects directly to one or more
servers. (SNIA)
disk mirroring
See
DMA
Direct memory access.
drive module
A FRU consisting of a disk drive and drive sled.
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