HP StorageWorks 2000 Modular Smart Array Reference Guide (481599-003, August 2008)

312 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008
out-of-band
management Method of accessing and managing a system using the RS-232 or
Ethernet connection.
ownership In an active-active configuration, one controller has ownership of the
following resources: virtual disks and vdisk spares. When a controller
fails, the other controller assumes temporary ownership of its resources.
PHY Hardware component that converts between digital and analog in the
signal path between the Storage Controller, Expander Controller, disk
drives, and SAS ports.
PID Primary controller identifier number.
point-to-point Point-to-point is an alternative to FC-AL topology and is required in
some fabric switch configurations. The controller enclosure supports
point-to-point connections only to fabric ports (F_Ports). Loop
topology is appropriate for most fabric switches, as it provides more
flexibility when considering fault-tolerant designs.
port bypass circuit
(PBC) See host port interconnect.
port WWN See world wide port name (WWPN).
power-and-cooling
module A FRU that includes an AC power supply and two cooling fans. An
enclosure has two power-and-cooling modules for failure tolerance and
can operate with only one module.
priority Priority enables controllers to serve other I/O requests while running
jobs (utilities) such as rebuilding virtual disks. Priority ranges from low,
which uses the controller’s minimum resources, to high, which uses the
controller’s maximum resources.
RAID Redundant Array of Independent Disks, a family of techniques for
managing multiple disks to deliver desirable cost, data availability, and
performance characteristics to host environments. (SNIA)
RAID controller See controller.
RAIDIO RAID input/output; a nickname for the controller board.