3Ware 9550SXU16MLB10 User Guide - Page 188

The process of making a unit unavailable to

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Glossary preserved on the paired drive. Mirrored disk arrays include RAID 1 and RAID 10. „ Non-redundant units. A disk array without fault tolerance (RAID 0, single disk, or JBOD.). „ OCE (Online Capacity Expansion). The process of increasing the size of an existing RAID unit without having to create a new array. „ Parity. Information that the controller calculates using an exclusive OR (XOR) algorithm and writes to the disk drives in RAID 5 and 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. „ Port ID. A unique identifier for a specific port in a system. Also called a drive ID. „ Rebuild task schedule. The specification for when rebuilding, may occur, including start time and duration. „ Rebuild a unit. To generate data on a new drive after it is put into service to replace a degraded drive in a fault tolerant unit (for example, RAID 1, 10, 5, or 50). „ Redundancy. Duplication of data on another drive or drives, so that it is protected in the event of a drive failure. „ Remove a drive. The process of making a drive unavailable to the controller. „ Remove a unit. The process of making a unit unavailable to the controller and the operating system. After a unit is removed it can be hot swapped out of the system.This is sometimes referred to as exporting a unit. „ RLM (RAID Level Migration). The process of using an existing unit of one or more drives and converting it to a new RAID type without having to delete the original unit. For example, converting a single disk to a mirrored disk or converting a RAID 0 unit to a RAID 5 unit. „ Self-test. A unit test that can be performed on a scheduled basis. in 3DM, available self-tests include Upgrade UDMA mode and Check SMART Thresholds. „ Stagger time. The delay between drive groups that will spin up, at one time, on a particular controller. „ Stripe size. The size of the data written to each disk drive in RAID unit levels that support striping. The size of stripes can be set for a given unit 182 3ware 9000 Series Serial ATA RAID Controller User Guide

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Glossary
182
3ware 9000 Series Serial ATA RAID Controller User Guide
preserved on the paired drive. Mirrored disk arrays include RAID 1 and
RAID 10.
Non-redundant units.
A disk array without fault tolerance (RAID 0,
single disk, or JBOD.).
OCE (Online Capacity Expansion).
The process of increasing the size of
an existing RAID unit without having to create a new array.
Parity.
Information that the controller calculates using an exclusive OR
(XOR) algorithm and writes to the disk drives in RAID 5 and 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.
Port ID
. A unique identifier for a specific port in a system. Also called a
drive ID.
Rebuild task schedule
. The specification for when rebuilding, may
occur, including start time and duration.
Rebuild a unit
. To generate data on a new drive after it is put into service
to replace a degraded drive in a fault tolerant unit (for example, RAID 1,
10, 5, or 50).
Redundancy.
Duplication of data on another drive or drives, so that it is
protected in the event of a drive failure.
Remove a drive.
The process of making a drive unavailable to the
controller.
Remove a unit.
The process of making a unit unavailable to the
controller and the operating system. After a unit is removed it can be hot
swapped out of the system.This is sometimes referred to as exporting a
unit.
RLM (RAID Level Migration).
The process of using an existing unit of
one or more drives and converting it to a new RAID type without having
to delete the original unit. For example, converting a single disk to a
mirrored disk or converting a RAID 0 unit to a RAID 5 unit.
Self-test.
A unit test that can be performed on a scheduled basis. in 3DM,
available self-tests include Upgrade UDMA mode and Check SMART
Thresholds.
Stagger time.
The delay between drive groups that will spin up, at one
time, on a particular controller.
Stripe size
. The size of the data written to each disk drive in RAID unit
levels that support striping. The size of stripes can be set for a given unit