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declustered array (DA)

A disjoint subset of the pdisks in a recovery group.

dependent leset

A leset that shares the inode space of an existing independent leset.

DFM

See direct FSP management (DFM).

DHCP

See Dynamic Host Conguration Protocol (DHCP).

drawer control module (DCM)

Essentially, a SAS expander on a storage enclosure drawer.

Dynamic Host Conguration Protocol (DHCP)

A standardized network protocol that is used on IP networks to dynamically distribute such network

conguration parameters as IP addresses for interfaces and services.

Elastic Storage System (ESS)

A high-performance, GPFS NSD solution made up of one or more building blocks. The ESS software

runs on ESS nodes - management server nodes and I/O server nodes.

encryption key

A mathematical value that allows components to verify that they are in communication with the

expected server. Encryption keys are based on a public or private key pair that is created during the

installation process. See also le encryption key (FEK), master encryption key (MEK).

ESS

See Elastic Storage System (ESS).

environmental service module (ESM)

Essentially, a SAS expander that attaches to the storage enclosure drives. In the case of multiple

drawers in a storage enclosure, the ESM attaches to drawer control modules.

ESM

See environmental service module (ESM).

failback

Cluster recovery from failover following repair. See also failover.

failover

(1) The assumption of le system duties by another node when a node fails. (2) The process of

transferring all control of the ESS to a single cluster in the ESS when the other clusters in the ESS fails.

See also cluster. (3) The routing of all transactions to a second controller when the rst controller fails.

IBM Elastic Storage System 5147-102 User Manual

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