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Glossary
This glossary provides terms and definitions for the IBM Elastic Storage System solution.
The following cross-references are used in this glossary:
• See refers you from a non-preferred term to the preferred term or from an abbreviation to the spelled-
out form.
• See also refers you to a related or contrasting term.
For other terms and definitions, see the IBM Terminology website (opens in new window):
http://www.ibm.com/software/globalization/terminology
B
building block
A pair of servers with shared disk enclosures attached.
BOOTP
See Bootstrap Protocol (BOOTP).
Bootstrap Protocol (BOOTP)
A computer networking protocol that is used in IP networks to automatically assign an IP address to
network devices from a configuration server.
C
CEC
See central processor complex (CPC).
central electronic complex (CEC)
See central processor complex (CPC).
central processor complex (CPC)
A physical collection of hardware that consists of channels, timers, main storage, and one or more
central processors.
cluster
A loosely-coupled collection of independent systems, or nodes, organized into a network for the
purpose of sharing resources and communicating with each other. See also GPFS cluster.
cluster manager
The node that monitors node status using disk leases, detects failures, drives recovery, and selects
file system managers. The cluster manager is the node with the lowest node number among the
quorum nodes that are operating at a particular time.
compute node
A node with a mounted GPFS file system that is used specifically to run a customer job. ESS disks are
not directly visible from and are not managed by this type of node.
CPC
See central processor complex (CPC).
D
DA
See declustered array (DA).
datagram
A basic transfer unit associated with a packet-switched network.
DCM
See drawer control module (DCM).
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Copyright IBM Corp. 2019, 2021
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