HP Smart Array 6400 Series Controllers Support Guide, September 2007

logical drive has performance advantages over individual physical disks. Also known as a
logical volume.
logical drive
capacity
extension
See capacity extension.
Low Voltage
Differential
(LVD)
A type of SCSI signaling that enables a maximum transfer rate of either 80 MB/s or 160 MB/s,
conforming to either the Wide Ultra2 or Wide Ultra160 SCSI standards, respectively.
online spare A fault-tolerant system that normally contains no data. When any other disk in the array fails,
the controller automatically rebuilds the data that was on the failed disk onto the online spare.
Also known as a hot spare.
PCI-X An enhanced PCI bus that enables operation at 133 MHz, equivalent to a data throughput of
1 GB/s. PCI-X is backward compatible with PCI systems and devices that operate at 66 MHz
or 33 MHz.
rebuild See Automatic Data Recovery.
Redundant Array
of Independent
Disks (RAID)
A form of fault tolerance. RAID 0 (no fault tolerance) uses data striping to distribute data evenly
across all physical disks in the array, but has no redundant data. RAID 1+0 (disk mirroring)
duplicates data from one disk onto a second disk. RAID 5 (distributed data guarding) distributes
parity data across all disks in the array, and uses the parity data and data on remaining disks
to reconstruct data from a failed disk. RAID ADG (advanced data guarding) is similar to RAID
5, but uses two independent sets of parity data. For more information, see the RAID Technology
Overview at:
http://docs.hp.com/en/netcom.html#Smart%20Array%20%28RAID%29
SCSI ID A unique ID number assigned to each SCSI device connected to a SCSI bus. The ID number
determines the device priority on the SCSI bus; ID 7 is the highest priority and is always assigned
to the SCSI controller.
Self-Monitoring,
Analysis, and
Reporting
Technology
(S.M.A.R.T.)
Technology codeveloped by HP and the physical disk industry that provides warning of
imminent disk failure. S.M.A.R.T. enables HP to offer Pre-Failure Warranty replacement of
physical disks. S.M.A.R.T. supersedes the disk parameter tracking feature that was previously
used, because the self-monitoring routines used in S.M.A.R.T. are more accurate than the disk
parameter tracking tests. The self-monitoring routines are customized for each specific disk
type and have direct access to internal performance, calibration, and error measurements.
Simple Network
Management
Protocol (SNMP)
Governs network management and the monitoring of network devices and functions.
Single-Ended (SE) A type of SCSI signaling that enables a maximum transfer rate of 40 MB/s. Conforms to the
Wide-Ultra SCSI standard. Now being phased out in favor of LVD technology.
spare See online spare.
striping See data striping.
surface analysis See Auto-Reliability Monitoring.
Ultra, Ultra2,
Ultra160, Ultra320
A set of SCSI standards that support maximum signal transfer rates of 40 MB/s, 80 MB/s, 160
MB/s, and 320 MB/s respectively.
Very High
Density Cable
Interconnect
(VHDCI)
An external SCSI connector used by Ultra SCSI controllers.
80 Glossary