HP D5970A - NetServer - LCII Installation And User Manual page 161

Appendix B
A "standby" disk drive of identical or larger size is found attached to the
same controller.
All of the system drives that are dependent on the failed disk are redundant
system drives, for example, RAID 1, RAID 3, RAID 5, and RAID 0+1.
NOTE
The automatic rebuild will only happen on the SAME
controller, never across controllers.
A "Hot Spare" disk can be created in one of two ways:
a. When configuring via a configuration utility, all disks attached to the
controller that are NOT configured into any disk array will be
automatically labeled as hot spare drives.
b. A disk drive may also be added (attached at a later time) to a running
system and labeled as a hot spare.
c. The controller creates the hot spare.
During the automatic rebuild process, system activity continues as normal. System
performance may degrade slightly during the rebuild process.
To use the automatic rebuild feature, you should always maintain a hot spare drive
in your system. When a drive fails, the hot spare will automatically replace the
failed drive and the data will be rebuilt. The system administrator can disconnect
and remove the bad drive and replace it with a new drive. The administrator can
then make this new drive a hot spare.
Stripe Order
The order in which disk drives appear within a drive group. This order must be
maintained to access the data correctly, and is critical to the controller's ability to
'Rebuild' failed drives.
Stripe Size
The stripe size is defined as the size, in kilobytes (1024 bytes) of a single I/O
operation. A stripe of data (data residing in actual physical disk sectors, which are
logically ordered first to last) is divided over all drive group disks.
Stripe Width
The number of striped drives within a drive group.
Striping
Refers to the storing of a sequential block of incoming data across multiple drives
in a group. For example, if there are 3 drives in a group, the data will be separated
Glossary
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