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Glossary 141
H
Host System
Any system on which the RAID controller is installed. Mainframes,
workstations, and personal systems can all be considered host systems.
Hot Spare
An idle, powered on, stand-by physical disk ready for immediate use in case of
disk failure. It does not contain any user data. A hot spare can be dedicated to a
single redundant virtual disk or it can be part of the global hot-spare pool for all
virtual disks controlled by the controller.
When a disk fails, the controllers' firmware automatically replaces and rebuilds
the data from the failed physical disk to the hot spare. Data can be rebuilt only
from virtual disks with redundancy (RAID levels 1, 5, 10, or 50; not RAID 0),
and the hot spare must have sufficient capacity.
If the hot spare is designated as having enclosure affinity, it attempts to
rebuild any failed disks on the backplane within which it resides prior to
rebuilding any other on other backplanes.
Hot Swap
Replacement of a failed component while the system is running and operating
normally.
I
Initialization
The process of writing zeros to the data fields of a virtual disk and, in fault
tolerant RAID levels, generating the corresponding parity to put the virtual disk
in a Ready state. Initializing erases previous data and generates parity so that the
virtual disk passes a consistency check. Virtual disks can work without
initializing, but they can fail a consistency check because the parity fields have
not been generated.
Dell_PERC6.1_UG.book Page 141 Wednesday, April 15, 2009 4:18 PM