3Ware 9650SE-2LPML User Manual page 277

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• Distributed parity.
across several drives in RAID 5, RAID 6, and RAID 50 configurations.
Distributing parity data across drives provides both protection of data
good performance.
• . A unique identifier for a specific drive in a system. Also called a
Drive ID
port ID.
• Drive Number . The SCSI number, or channel number, of a particular
drive.
• Error correction code. ECC Errors are grown defects that have
ECC.
occurred on a drive since it was last read.
• . Determines whether an error detected during a rebuild
ECC Error policy
stops the rebuild or whether the rebuild can continue in spite of the error.
Specified by the Continue on Source Error During Rebuild unit policy.
•
EMS (Enclosure Management Services).
for environmental, power, mechanical monitoring, and control using the
I²C (chassis control) bus port.
• Export a unit . To remove the association of a unit with a controller. Does
not affect the data on the drives. Used for array roaming, when you want
to swap out a unit without powering down the system, and move the unit
to another controller. Compare to Delete, which erases all unit
configuration information from the drive.
•
Exportable unit or drive
are those that will be available to the operating system when you boot
your computer.
• . A RAID unit which provides the ability to recover from a
Fault tolerant
failed drive, either because the data is duplicated (as when drives are
mirrored) or because of error checking (as in a RAID 5 unit).
• Computer programming instructions that are stored in a read-
Firmware.
only memory on the controller rather than being implemented through
software.
• Grown defect. Defects that arise on a disk from daily use.
• Hot spare. A drive that is available, online, and designated as a spare.
When a drive fails in a redundant unit, causing the unit to become
degraded, a hot spare can replace the failed drive automatically and the
unit will be rebuilt.
• . The process of removing a disk drive from the system
Hot swapping
while the power is on. Hot swapping can be used to remove units with
data on them, when they are installed in hot-swap carriers. Hot swapping
can also be used to remove and replaced failed drives when a hot-swap
carrier is used.
Parity (error correction code) data is distributed
. In 3BM (BIOS), exportable units and drives
Chassis-monitoring functions
and
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