HP StorageWorks 2/64 - Core Switch, Command Reference Manual

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Fabric OS 5.x command reference guide 801
digital certificate An electronic document issued by a CA (certificate authority) to an entity, containing the
public key and identity of the entity. Entities in a secure fabric are authenticated based on
these certificates. See also authentication , CA , public key .
disparity The proportion of 1s and 0s in an encoded character. Neutral disparity means an equal
number of each, positive disparity means a majority of 1s, and negative disparity means a
majority of 0s.
DLS Dynamic load-sharing. Dynamic distribution of traffic over available paths. Allows for
recomputing of routes when an Fx_Port or E_Port changes status.
DMTF Distributed Management Task Force.
domain controller A domain controller or embedded port communicates with and gets updates from other
switches' embedded ports. The well-known address is fffcdd , where dd = domain number).
domain ID A unique identifier for all switches in a fabric, used in routing frames. Usually automatically
assigned by the principal switch but can be assigned manually. The domain ID for an HP
StorageWorks switch can be any integer between 1 and 239.
DTE Data terminal equipment. Usually refers to a terminal.
DWDM Dense wave division multiplexing. Allows more wavelengths to use the same fiber. See WDM .
E_D_TOV Error-detect timeout value. The minimum amount of time a target waits for a sequence to
complete before initiating recovery. Can also be defined as the maximum time allowed for a
round-trip transmission before an error is declared. See also R_A_TOV , RR_TOV .
E_Port Expansion port. A standard Fibre Channel mechanism that enables switches to network with
each other, creating an ISL. See also ISL .
ECCN Export classification control number. A government classification of encryption. For example,
SSH is in the high-encryption category (number 5x02) and therefore has certain restrictions
regarding its transfer.
edge fabric A Fibre Channel fabric connected to an FC router via an EX_Port (where hosts and storage are
attached in a meta-SAN).
EE_Credit End-to-end credit. The number of receive buffers allocated by a recipient port to an originating
port. Used by Class 1 and 2 services to manage frame exchange across the fabric, between
source and destination. See also BB_Credit , end-to-end flow control .
EIA rack A storage rack that meets the standards set by the Electronics Industry Association (EIA).
ELP Exchange link parameters.
ELS Extended link service. ELSs are sent to the destination N_Port to perform the requested function
or service. ELS is a Fibre Channel standard that is sometimes referred to as “Fibre Channel
Physical (FC_PH) ELS.”
EM Environmental monitor. Monitors FRUs and reports failures.
embedded port An embedded port (or domain controller) communicates and get updates from other switches'
embedded ports. The well-known address is fffcdd , where dd = domain number.
EMI Electromagnetic interference.
emulex A brand of host bus adapter.
enabled zone
configuration
The currently enabled configuration of zones. Only one configuration can be enabled at a
time. See also defined zone configuration , zone configuration .