Users guide

Intel® RAID Software User Guide 340
RAID 6 Uses data striping and parity data across three or more drives
(distributed parity) to provide high data throughput and data
redundancy, especially for applications that require random access.
RAID 6 can survive the failure of two drives.
RAID 10 A combination of RAID 0 and RAID 1 that uses data striping across
two mirrored drive groups. It provides high data throughput and
complete data redundancy.
RAID 50 A combination of RAID 0 and RAID 5 that uses data striping across
two drive groups with parity data. It provides high data throughput
and complete data redundancy.
RAID 60 A combination of RAID 0 and RAID 6 that uses data striping across
two drive groups with parity data. It provides high data throughput
and complete data redundancy. RAID 60 can survive the failure of
two drives in each RAID set in the spanned drive group.
RAID level A virtual drive property indicating the RAID level of the virtual drive.
Intel
®
RAID Controllers support RAID levels 0, 1, 5, 6, 10, 50, and
60.
RAID migration A feature in RAID subsystems that allows changing a RAID level to
another level without powering down the system.
Raw capacity A drive property indicating the actual full capacity of the drive before
any coercion mode is applied to reduce the capacity.
Read policy A controller attribute indicating the current Read Policy mode. In
Always Read Ahead mode, the controller reads sequentially ahead
of requested data and stores the additional data in cache memory,
anticipating that the data will be needed soon. This speeds up reads
for sequential data, but there is little improvement when accessing
random data. In No Read Ahead mode (known as Normal mode in
WebBIOS), read ahead capability is disabled.
Rebuild The regeneration of all data to a replacement drive in a redundant
virtual drive after a drive failure. A drive rebuild normally occurs
without interrupting normal operations on the affected virtual drive,
though some degradation of performance of the drive subsystem
can occur.
Rebuild rate The percentage of central processing unit (CPU) resources devoted
to rebuilding data onto a new drive after a drive in a storage
configuration has failed.
Reclaim virtual drive A method of undoing the configuration of a new virtual drive. If you
highlight the virtual drive in the Configuration Wizard and click
Reclaim, the individual drives are removed from the virtual drive
configuration.
Reconstruction rate The user-defined rate at which a drive group modification operation
is carried out.
Redundancy A property of a storage configuration that prevents data from being
lost when one drive fails in the configuration.