3Ware 9550SXU-12 User Manual page 330

Glossary
318
•
OCE (Online Capacity Expansion).
an existing RAID unit without having to create a new unit. See also
migration.
• Information that the controller calculates using an exclusive OR
Parity.
(XOR) algorithm and writes to the disk drives in RAID 5, RAID 6, and
RAID 50 units. This data can be used with the remaining user data to
recover the lost data if a disk drive fails.
• . Printed circuit board.
PCB
• P-Chip. PCI interface chip that connects the PCI bus to the high-speed
internal bus and routes all data between the two using a packet switched
fabric. There is one P-chip per controller card.
• Phys are transceivers that transmit and receive the serial data stream
Phy.
that flows between the controller and the drives. 3ware 9690SA
controllers have 8 phys. These phys are associated with virtual ports
(vports) by 3ware software to establish up to 128 potential connections
with the SAS or SATA hard drives.
• The ID number (0-7) assigned to each of the 8 phys on the
Phy Identifier.
9690SA controller.
• 3ware controller models prior to the 9690SA series have one or
Port.
many ports (typically 4, 8, 12, 16, or 24). Each port can be attached to a
single disk drive. On a controller with a Multi-lane™ serial port
connector, one connector supports four ports (eight if 24-port controller).
On 9690SA series controllers, connections are made with phys and vports
(virtual ports). See "phy" and "VPort".
• . A unique identifier for a specific port in a system. Also called a
Port ID
drive ID.
• . SATA drives can use Native Command Queuing (NCQ) to
Queuing
improve performance in applications that require a lot of random access
to data, such as server-type applications. When NCQ is enabled, the
commands are reordered on the drive itself.
NCQ must be supported by the drive. NCQ must be turned on in both the
drive and the RAID controller. By default, the RAID unit's queue policy
is disabled when creating a unit.
• RAID. Redundant array of inexpensive disks, combined into a unit
(array), to increase your storage system's performance and provide fault
tolerance (protection against data loss).
•
Rapid RAID Recovery.
speed with which a redundant unit can be made redundant again when a
rebuild is required. It can also increase the speed of verification or
initialization that may occur in the event of an unclean shutdown.
3ware SAS/SATA RAID Software User Guide, Version 9.5.1
The process of increasing the size of
The Rapid Raid Recovery feature increases the