Glossary
console LUN
A
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.
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