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Glossary
116 Command View EVA Storage System Scripting Utility Reference Guide
console LUN
A SCSI-3 virtual object that makes a controller pair accessible by the host before any virtual disks
are created. Also called a communication LUN.
console LUN ID
The ID that can be assigned when a host operating system requires a unique ID. The console LUN
ID is assigned by the user, usually when the storage system is initialized.
See also console LUN.
controller
A hardware/firmware device that manages communications between host systems and other
devices. Controllers typically differ by the type of interface to the host and provide functions
beyond those the devices support.
controller pair
Two interconnected controller modules that together control a physical disk array. A controller
pair and the disk array together constitute a storage system.
default disk group
The first disk group created at the time the system is initialized. The default disk group can contain
the entire set of physical disks in the array or just a few of the disks.
See also disk group.
disk
A physical storage device (disk drive) connected to the system.
disk failure protection
A method by which a controller pair reserves drive capacity to take over the functionality of a
failed or failing physical disk.
DISK_GROUP
A collection of disks from which storage is created.
DR_GROUP
One or more data replication groups that preserve write ordering and share a common log.
EMU
Environmental Monitoring Unit. An element that monitors the status of an enclosure, including the
power, air temperature, and blower status. The EMU detects problems and displays and reports
these conditions to a user and the controller. In some cases, the EMU implements corrective
action.