HP EVA P6000 Storage - Manual (Page 309)

T
TB Terabyte. A term defining either:
•
A data transfer rate.
•
A measure of either storage or memory capacity of 1,099,5111,627,776 (2
40
) bytes.
See also TBps .
TBps Terabytes per second. A data transfer rate of 1,000,000,000,000 (10
12
) bytes per second.
TC Termination Code. An Enterprise Storage System controller 8-character hexadecimal display that
defines a problem causing controller operations to halt.
Termination Code See TC .
termination event The occurrences that cause a storage system to cease operation.
terminator Interconnected elements that form the ends of the transmission lines in the enclosure address bus.
topology An interconnection scheme that allows multiple Fibre Channel ports to communicate. Point-to-point
and arbitrated loop are examples of Fibre Channel topologies.
transceiver 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 Unit identification.
uninitialized
system A state in which the storage system is not ready for use.
UNRECOVERABLE
condition 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.
unwritten cached
data Also known as unflushed data.
See also
dirty data .
UPS 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.
UUID 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 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.
virtual disk copy 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 .
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 .
Vraid 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.
Vraid0 Optimized for I/O speed and efficient use of physical disk space, but provides no data
redundancy.
Vraid1 Optimized for data redundancy and I/O speed, but uses the most physical disk space.
Vraid5 Provides a balance of data redundancy, I/O speed, and efficient use of physical disk space.
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