LSI 3ware SAS 9750-8i Uživatelská příručka stáhnout pdf (Strana 319)

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RAID 50 units. This data can be used with the remaining user data to

recover the lost data if a disk drive fails.

•

PCB. Printed circuit board.

•

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.

•

Phy. Phys are transceivers that transmit and receive the serial data stream

that flows between the controller and the drives. 3ware 9750 controllers

have 8 phys. These phys are associated with virtual ports (vports) by

3ware software to establish up to 96 potential connections with the SAS

or SATA hard drives.

•

Phy Identifier. The ID number (0-7) assigned to each of the 8 phys on the

9750 controller.

•

Port. 3ware controller models prior to the 9690SA series have one or

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 9750 and 9690SA series controllers, connections are made with phys

and vports (virtual ports). See “phy” and “VPort”.

•

Port ID. A unique identifier for a specific port in a system. Also called a

drive ID.

•

Queuing. SATA drives can use Native Command Queuing (NCQ) to

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. The Rapid Raid Recovery feature increases the

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.

•

Read Cache. Read Cache stores data from media locally on the controller

to improve read access times for applications. The 3ware Read Cache

feature also includes an Intelligent Mode, which enables Intelligent Read

Prefetch (IRP). IRP includes a typical read-ahead caching method which

is used to proactively retrieve data from media and store it locally on the

controller with the anticipation that it may be requested by the host.

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LSI 3ware SAS 9750-8i Uživatelská příručka Strana 319

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