Dell POWEREDGE R720 - Manual (Page 9)

Double-data Rate (DDR) Double-data rate. A technology in memory modules that potentially doubles the data rate by
transferring data on both the rising and falling pulses of a clock cycle.
DRAC See Dell Remote Access Controller.
DRAM See Dynamic random-access memory.
Dual Redundant In Dell Compellent Storage Center, a storage profile option for protecting against the loss of
any two drives, typically by using RAID 10 and/or RAID 6.
DVD See Digital Versatile Disc.
Dynamic Host
Configuration Protocol
(DHCP) A method of automatically assigning an IP address to a client system.
Dynamic random-
access memory
(DRAM) A system's RAM is usually made up entirely of DRAM chips.
EKM See Dell Encryption Key Manager.
EKM Administrator In the context of EKM, the super user who can create or delete users and groups.
EKM Encryption
Manager (tklmadmin) In the context of EKM, the daily user who creates or deletes keys and devices.
Emergency Mode In Dell Compellent Storage Center, a mode that is reached when the system can no longer
operate because there is no more free space. In emergency mode, all server I/O is rejected
and all volumes are taken offline and cannot be brought back online until enough space is
freed to exit emergency mode. See Conservation Mode .
enclosure A physical enclosure that provides a single interface, power, and cooling to multiple disks or
blades.
environment In the context of Dell AIM, the collection of hardware, software, and network configurations
managed by a Dell AIM Controller.
Eth0 See Ethernet port 0.
Eth1 See Ethernet port 1.
Ethernet port 0 (Eth0) In Dell Compellent Storage Center, Eth0 is an Ethernet interface dedicated to management.
Ethernet port 1 (Eth1) In Dell Compellent Storage Center, Eth1 is an Ethernet interface dedicated to inter-process
communication between controllers, for clustering or remote replication.
external network In the context of the Dell AIM environment, a network that is not part of the Dell AIM
environment but is physically and logically connected to it.
external switch In the context of the Dell Aim environment, a switch that is not part of the Dell AIM
environment, but is physically and logically connected to it.
Fabric A combination of interconnected switches that act as a unified routing infrastructure. It
allows multiple connections among devices on a SAN and lets new devices enter
unobtrusively. A FC (or iSCSI) topology with at least one switch present on the network.
FastTrack An optional Dell Compellent Storage Center utility that dynamically places the most active
data on the outer (faster) disk tracks.
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