Chapter A. Glossary
244 3ware Serial ATA RAID Controller User Guide
• Carve size. The size over which a unit will be divided into volumes, if
auto-carving is enabled.
•
CLI. Command Line Interface. The 3ware CLI is a text program, rather
than a GUI (graphical user interface), for Windows, Linux, and FreeBSD.
It has the same functionality as 3DM, and can be used to view, maintain,
and manage 3ware controllers, disks, and units.
•
Configuration. The RAID level set for a unit.
•
Controller ID number. The unique SCSI number in the Windows
environment, or the Channel number in the Linux environment, of a
particular controller. Typically assigned by the operating system.
•
Create an array. The process of selecting individual disk drives and
selecting a RAID level. The array will appear to the operating system as a
single unit. Overwrites any existing unit configuration data on the drives.
Note that in 3ware software tools, arrays are referred to as units.
•
DCB. Disk configuration block. This is 3ware proprietary RAID table
information that is written to disk drives that are in a RAID unit, single
disk, or spare. The DCB includes information on the unit type, unit
members, RAID level, and other important RAID information.
•
Delete an array. Deleting an array (or unit) is the process of returning the
drives in a unit to individual drives. This erases the DCB information
from the drives and deletes any data that was on them. When a unit is
deleted from a controller, it is sometimes referred to as being “destroyed.”
If you want to remove a unit without deleting the data on it, do not delete
it; instead use the Remove feature in 3DM, and then physically remove
the drives.
•
Destroying. Same as deleting a unit.
•
Degraded unit. A redundant unit that contains a drive that has failed.
• Disk roaming. When moving a unit from one controller to another, refers
to putting disks back in a different order than they initially occupied,
without harm to the data.
•
Distributed parity. Parity (error correction code) data is distributed across
several drives in RAID 5 and RAID 50 configurations. Distributing parity
data across drives provides both protection of data
and good
performance.
• Drive ID. A unique identifier for a specific drive in a system. Also called a
port ID.
•
Drive Number. The SCSI number, or channel number, of a particular
drive.
•
ECC. Error correction code.
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