Dell PowerEdge RAID Controller 6i - Manual (Page 151)

Glossary
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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.
SSP
Acronym for Serial SCSI Protocol. SSP enables communication with other SAS
devices. Each PHY on the SAS controller can function as an SSP initiator or
SSP target.
Storport
The Storport driver has been designed to replace SCSIport and work with
Windows 2003 and beyond. In addition, it offers better performance for RAID
controller newer protocols (like SAS), providing higher I/O throughput rates,
improved manageability, and an upgraded miniport interface. For example,
while SCSIport allows a maximum of 254 commands per controller, Storport
allows 254 command per logical unit number (LUN).
STP
Acronym for Serial Tunneling Protocol, STP, enables communication with a
Dell-qualified SATA device through an attached expander. Each PHY on the
SAS controller can function as an STP initiator.
Stripe Element
A stripe element is the portion of a stripe that resides on a single physical disk.
See also striping.
Dell_PERC6.1_UG.book Page 151 Wednesday, April 15, 2009 4:18 PM