HP EVA P6550 HP P6300/P6500 EVA User Guide (5697-2486, September 2013) - Page 309

T TB TBps TC Termination Code termination event terminator topology transceiver Terabyte. A term defining either: • A data transfer rate. • A measure of either storage or memory capacity of 1,099,5111,627,776 (240) bytes. See also TBps. Terabytes per second. A data transfer rate of 1,000,000,000,000 (1012) bytes per second. Termination Code. An Enterprise Storage System controller 8-character hexadecimal display that defines a problem causing controller operations to halt. See TC. The occurrences that cause a storage system to cease operation. Interconnected elements that form the ends of the transmission lines in the enclosure address bus. An interconnection scheme that allows multiple Fibre Channel ports to communicate. Point-to-point and arbitrated loop are examples of Fibre Channel topologies. The device that converts electrical signals to optical signals where the fiber cables connect to the Fibre Channel elements such as hubs, controllers, or adapters. U UID uninitialized system UNRECOVERABLE condition unwritten cached data UPS UUID Unit identification. A state in which the storage system is not ready for use. A drive enclosure EMU condition report that occurs when one or more elements inside the enclosure have failed and have disabled the enclosure. The enclosure may be incapable of recovering or bypassing the failure and will require repairs to correct the condition. This is the highest level condition and has precedence over all other errors and requires immediate corrective action. Also known as unflushed data. See also dirty data. Uninterruptible Power Supply. A battery-operated power supply guaranteed to provide power to an electrical device in the event of an unexpected interruption to the primary power supply. Uninterruptible power supplies are usually rated by the amount of voltage supplied and the length of time the voltage is supplied. Unique Universal Identifier. A unique 128-bit identifier for each component of an array. UUIDs are internal system values that users cannot modify. V virtual disk virtual disk copy virtual disk family Vraid Vraid0 Vraid1 Vraid5 Variable disk capacity that is defined and managed by the array controller and presented to hosts as a disk. Can be called Vdisk in the user interface. A clone or exact replica of another virtual disk at a particular point in time. Only an active virtual disk can be copied. A copy immediately becomes the active disk of its own virtual disk family. See also active member of a virtual disk family. A virtual disk and its snapshot, if a snapshot exists, constitute a family. The original virtual disk is called the active disk. When you first create a virtual disk family, the only member is the active disk. See also active member of a virtual disk family, virtual disk copy. The level to which user data is protected. Redundancy is directly proportional to cost in terms of storage usage; the greater the level of data protection, the more storage space is required. Optimized for I/O speed and efficient use of physical disk space, but provides no data redundancy. Optimized for data redundancy and I/O speed, but uses the most physical disk space. Provides a balance of data redundancy, I/O speed, and efficient use of physical disk space. 309