Hewlett-Packard 127695-B21 - Smart Array 431 RAID Controller Manual

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Smart Array Controller Technology: Drive Array Expansion and Extension
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The information in this document is subject to change without notice.
10/2002
P/N TC021003TB
glossary
Array – A group of physical drives. The ACU groups physical drives together for
logical drives to be created upon them. A single physical drive can be part of
only one array (excluding spares), but an array can be made up of multiple
physical drives. Logical drives can span only one array.
Basic Disk - Microsoft’s classic partition system on which each volume uses only
one partition. A basic disk cannot grow in size without using a third party
application. This system is the default in NT 4.0.
Dynamic Disk - Microsoft’s new default partition system for Windows 2000. In this
system, a volume can span multiple partitions. Thus an administrator can grow a
volume by adding additional partitions.
Expansion - The process of adding a physical drive to an existing array. The
logical drives that exist on the array before the expansion takes place are
unchanged. Only the amount of free space on the array changes.
Extension - The process of growing the size of a logical drive. In this case the size
of the logical drive reported to the OS is increased.
Free space - Blocks on an array that are currently not assigned to a logical
drive. Free space can be used for creating new logical drives, changing the
RAID level of an existing logical drive, or growing the size of an existing logical
drive.
Logical drive – A logical partitioning of space on physical drives on an array
controller that is presented to the operating system as though it were an actual
single physical drive attached to a SCSI controller. This entity can make use of
differing RAID levels for fault tolerance.
MS Expansion – Microsoft’s use of the term expansion refers to adding partitions
to a volume using dynamic disks and growing the size of that volume.
Partition - Logical entity created on a logical drive by the operating system that
can be used by the operating system.
RAID – Redundant Array of Independent Disks.
Volume - In Windows, this is what is given a drive letter. It is created on a
partition or group of partitions.