Dell PowerVault TL2000 User Manual page 274

overrun. Loss of data because a receiving device is
unable to accept data at the rate it is transmitted.
overtightening. To tighten too much.
P
parameter. A variable that is given a constant value
for a specified application and that may denote the
application.
p bit. Parity bit.
PC. Parity check.
PCC. Power control compartment.
PDF. Portable Document Format.
PE. Parity error. Product engineer.
pick. Pertaining to the library, to remove, by means of
a robotic device, a tape cartridge from a storage slot or
drive.
picker. A robotic mechanism located inside the library
that moves cartridges between the cartridge storage
slots and the drive.
PM. Preventive maintenance.
POR. Power-on reset.
port. A physical connection for communication
between the drive/library and the host processor.
Portable Document Format (PDF). A standard
specified by Adobe Systems, Incorporated, for the
electronic distribution of documents. PDF files are
compact, can be distributed globally (via e-mail, the
Web, intranets, or CD-ROM), and can be viewed with
the Acrobat Reader, which is software from Adobe
Systems that can be downloaded at no cost from the
Adobe Systems home page.
PROM. Programmable read only memory.
PS. Power supply.
PWR. Power.
R
rack. A unit that houses the components of a storage
subsystem, such as the library.
rackmount kit. A packaged collection of articles used
to install the rack mounted version of the library.
RAM. Random access memory.
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Dell PowerVault TL2000 Tape Library and TL4000 Tape Library User's Guide
Random access memory. A storage device into which
data is entered and from which data is retrieved in a
nonsequential manner.
RAS. Reliability, availability, and serviceability.
record. A collection of related data or words, treated
as a unit.
recording density. The number of bits in a single
linear track measured per unit of length of the
recording medium.
recoverable error. An error condition that allows
continued execution of a program.
ref. Reference.
reg. Register.
reinventory. To inventory again.
retention. The process or function of tightening the
tape onto the cartridge, if it is sensed that the tape has
a loose wrap on the cartridge.
RH. Relative humidity.
robot. Picker.
robotics. Picker assembly.
RPQ. Request for price quotation.
R/W. Read/write.
S
s. Seconds of time.
scratch cartridge. A data cartridge that contains no
useful data, but can be written to with new data.
SCSI. Small computer system interface.
SE. Single-ended.
segment. A part.
sel. Select.
Serial Attached SCSI (SAS). A drive sled with a SAS
interface can be linked directly to controllers. SAS is a
performance improvement over traditional SCSI
because SAS enables multiple devices (up to 128) of
different sizes and types to be connected
simultaneously with thinner and longer cables; its
full-duplex signal transmission supports 3.0 GBs. In
addition, SAS drives can be hot-plugged.
serialize. To change from parallel-by-byte to
serial-by-bit.