HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Glossary
279HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide
controller
A hardware device that, with proprietary software, facilitates communications between a
host and one or more storage devices organized in a storage array. The HP StorageWorks
HS-series family of controllers are all array controllers.
copying
A state in which data to be copied to the mirrorset is inconsistent with other members of the
mirrorset.
See also normalizing.
Copying member
Any member that joins the mirrorset after the mirrorset is created is regarded as a Copying
member. After all the data from the Normal member (or members) is copied to a
Normalizing or Copying Member, the Copying Member then becomes a Normal member.
See also Normalizing member.
CSR
Control and Status Register.
DAEMON
A program usually associated with a UNIX system that performs a utility (housekeeping or
maintenance) function without being requested or even known of by the user. A daemon is
a diagnostic and execution monitor.
data center cabinet (rack)
A generic reference to large subsystem racks, such as those in which HP StorageWorks
products can be mounted.
data striping
The process of segmenting logically sequential data, such as a single file, so that segments
can be written to multiple physical devices (usually disk drives) in a round-robin fashion.
This technique is useful if the processor is capable of reading or writing data faster than a
single disk can supply or accept the data. While data is being transferred from the first disk,
the second disk can locate the next segment.
DDL
Dual data link. The ability to operate on the CI bus with both paths simultaneously to the
same remote node.