HP P3410A - NetRAID 1M RAID Controller Installation And Configuration Manual page 175

RAID 10 results when data is striped across multiple RAID 1 logical
drives.
RAID 50 results when data is striped across multiple RAID 5 logical
drives.
Read Policy: The three Read policies for HP NetRAID are:
Read-Ahead: This is a memory caching ability that tells the adapter to
read sequentially ahead of requested data and cache the further data in
memory, anticipating that the further data will be requested. Read-Ahead
supplies sequential data faster, but is not as effective when accessing
random data.
Normal: This policy does not use the read-ahead memory caching feature.
This policy is efficient when most of the data reads are random.
Adaptive: Adaptive policy causes the read-ahead feature to be used if the
last two disk accesses were in sequential sectors.
Ready State: A condition in which a workable hard drive is neither online nor a
hot spare, and therefore is available to add to an array, or to designate as a hot
spare.
Rebuild: The regeneration of all data from a failed disk in a RAID level 1, 5, 10,
or 50 array to a replacement disk. A disk rebuild normally occurs without
interruption of application access to data stored on the logical drive.
Rebuild Rate: The speed at which the rebuild operation proceeds. Each adapter
is assigned a rebuild rate, which specifies the percentage of CPU resources to be
devoted to rebuild operations.
Reconstruct: The act of remaking a logical drive after changing RAID levels.
Redundancy: See RAID Levels
SAF-TE: SCSI Access Fault-Tolerant Enclosure; a processor that manages a
hot-swap mass storage cage or enclosure.
SCSI Channel: The HP NetRAID-1M and 2M adapters control the disk drives
via SCSI buses called "channels" over which the system transfers data in Fast-
and-Wide, Ultra SCSI, Ultra-2 SCSI, or Ultra-3 SCSI mode. The HP NetRAID-
2M adapter can control two SCSI channels. The HP NetRAID-1M adapter can
control one SCSI channel.
Glossary
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