Glossary - Adaptec DuraStor 7220SS User Manual

Glossary

A
active-active
Active-active mode is when two controllers in a storage system
cooperate to provide redundancy. If one controller fails, the
remaining controller takes over. To accomplish this, each controller
has two host ports, one of which is normally active, the other
normally passive. In a failed-over configuration, the passive port
becomes active and assumes the identity of the failed controller. In
active-active mode, arrays can be accessed only by the controller
that currently owns them. One controller will have no visibility to
the other controller's arrays. If a controller fails, the surviving
controller will take ownership of all arrays. Disk drives in the spare
pool and unassigned disk drives are visible to both controllers. See
also storage system.
array
Two or more physical disk drives grouped together to appear as a
single device (logical drive) to the user. Also known as a container.
See also mirror set (RAID 1); multilevel array; RAID 3; RAID 4;
RAID 5; stripe set (RAID 0); stripe set of mirror sets (RAID 0/1);
stripe set of RAID 5 sets (RAID 50); volume set.
B
bus
See channel.
C
channel
Any path used for the transfer of data and the control of
information between storage devices and a storage controller. Each
controller's channels are identified by a number. Also known as a
bus.
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