Dell PowerEdge RAID Controller H700 - Manual (Page 157)

Glossary 157
Glossary
A
Adapter Card
An adapter card enables the system to access peripheral devices by converting
the protocol of one bus or interface to another. For example, a RAID controller
is a type of adapter card that provides RAID functions. Adapter cards may reside
on the system board. It may also be in the form of an add-in card.
Adaptive Read-Ahead
Adaptive Read-Ahead is a read policy that specifies that the controller begins
using Read-Ahead caching if the two most recent disk accesses occur in
sequential sectors. If all read requests are random, the algorithm reverts to Non
Read-Ahead; however, all requests are still evaluated for possible sequential
operation.
Array
A grouping of physical disks that combines the storage space on the physical
disks into a single segment of contiguous storage space. The RAID controller
can group physical disks on one or more channels into an array. A hot spare disk
does not participate in an array.
B
Background Initialization
Background initialization is the automatic check for media errors on physical
disks. It ensures that striped data segments are the same on all physical disks in
a virtual disk. The difference between a background initialization and a
consistency check is that a background initialization is automatic for new virtual
disks. The operation starts within five minutes after you create the disk.
Baseport
Baseport is the base register of the memory address range provided by the host.
PERC7.2_UG.book Page 157 Thursday, March 3, 2011 2:14 PM