Dell 6 series User Manual page 153

SMART
Acronym for Self-Monitoring Analysis and Reporting Technology.
The self-monitoring analysis and reporting technology (SMART) feature
monitors the internal performance of all motors, heads, and drive electronics to
detect predictable drive failures. This feature helps monitor drive performance
and reliability, and protects the data on the drive. When problems are detected
on a drive, you can replace or repair the drive without losing any data.
SMART-compliant disks have attributes for which data (values) can be
monitored to identify changes in values and determine whether the values are
within threshold limits. Many mechanical failures and some electrical failures
display some degradation in performance before failure
SMP
Acronym for Serial Management Protocol. SMP communicates topology
management information directly with an attached SAS expander device.
Each PHY on the controller can function as an SMP initiator.
Spanning
The method by which nested RAID levels (such as RAID 10, 50, and 60) are
constructed from multiple sets of basic, or single RAID levels. For example, a
RAID 10 is made up of multiple sets of RAID 1 arrays where each RAID 1 set is
considered a span. Data is then striped (RAID 0) across the RAID 1 spans to
create a RAID 10 virtual disk. The same concept holds true for RAID 50 and 60
where multiple sets of RAID 5 or RAID 6 can be combined together with
striping. Spanning is generally used when referencing these three nested RAID
levels.
Spare
A physical disk available to replace another physical disk in case that physical
disk fails.
SSD
Acronym for solid-state drive. SSDs are storage devices that use solid-state
memory to store data as opposed to traditional rotational hard drives. SSDs can
be made to use either the SAS or SATA protocol.
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Glossary