User`s guide

ISR654606-00 A Glossary-3
Data Migration Service for HP StorageWorks MPX200
User’s Guide
path
A path to a device is a combination of an
adapter port instance and a target port as
distinct from internal paths in the fabric
network. A fabric network appears to the
operating system as an opaque network
between the adapter (initiator) and the
target.
Because a path is a combination of an
adapter and a target port, it is distinct from
another path if it is accessed through a
different adapter or it is accessing a
different target port. Consequently, when
switching from one path to another, the
driver might be selecting a different
adapter (initiator), a different target port, or
both.
This is important to the driver when
selecting the proper method of failover
notification. It can make a difference to the
target device, which might have to take
different actions when receiving retries of
the request from another initiator or on a
different port.
RAID
Redundant array of independent/inexpen-
sive disks. RAID technology groups
separate disks into one logical storage unit
(LUN) to improve reliability and/or perfor-
mance.
redundant array of
independent/inexpensive disks
See RAID.
SAN
Storage area network. Multiple storage
units (disk drives) and servers connected
by networking topology.
SCSI
Small computer system interface. A
high-speed interface used to connect
devices, such as hard drives, CD drives,
printers, and scanners, to a computer. The
SCSI can connect many devices using a
single controller. Each device is accessed
by an individual identification number on
the SCSI controller bus.
Secure shell
See SSH.
small computer system interface
See SCSI.
SSH
Secure shell. Protocol that secures
connections to the switch for the command
line interface.
storage area network
See SAN.
target
The storage-device endpoint of a SCSI
session. Initiators request data from
targets (usually disk-drives, tape-drives, or
other media devices). Typically, a SCSI
peripheral device is the target but an
adapter may, in some cases, be a target. A
target can contain many LUNs.
A target is a device that responds to a
requested by an initiator (the host system).
Peripherals are targets, but for some
commands (for example, a SCSI COPY
command), the peripheral may act as an
initiator.