IBM System Storage TS2900, Руководство по установке, эксплуатации и обслуживанию

Страница: 245 / 257

Glossary
I-7
microprogram . A group of microinstructions that
when executed performs a preplanned function. The
term microprogram represents a dynamic arrangement
or selection of one or more groups of microinstructions
for execution to perform a particular function. The term
microcode represents microinstructions used in a
product as an alternative to hard-wired circuitry to
implement certain functions of a processor or other
system component.
MIM . Media information message.
mm . Millimeter.
modifier . That which changes the meaning.
mount a device . To assign an I/O device with a request
to the operator.
MP . Microprocessor.
ms . Millisecond.
MSG . Message.
multipath . Pertaining to using more than one path.
N
N/A . Not applicable.
Network Address Translation (NAT) . NAT involves
rewriting the source and/or destination addresses of IP
packets as they pass through a router or firewall. Most
systems using NAT do so in order to enable multiple
hosts on a private network to access the Internet using a
single public IP address.
node . In a network, a point at which one or more
functional units connect channels or data circuits.
NTP . Network Time Protocol. This allows the library to
set its internal date and time based on the date and time
of a sever.
NVS . Nonvolatile storage. A storage device whose
contents are not lost when power is cut off.
O
oersted . The unit of magnetic field strength in the
centimeter-gram-second (cgs) electromagnetic system.
The oersted is the magnetic field strength in the interior
of an elongated, uniformly wound solenoid that is
excited with a linear current density in its winding of
one abampere per 4
π
centimeters of axial length.
offline . Pertaining to the operation of a functional unit
without the continual control of a computer. Contrast
with
online .
online . Pertaining to the operation of a functional unit
that is under the continual control of a computer.
Contrast with
offline .
OPER . Operation.
ov . Over voltage.
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.
PFS . Perfect forward secrecy.
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. See
accessor .
PM . Preventive maintenance.
POR . Power-on reset.
port . A physical connection for communication
between the 3590 and the host processor. The 3590 has
two SCSI ports.
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.
Private key . A cryptographic key used to decrypt a
message.
PROM . Programmable read only memory.
PS . Power supply.