Dell PowerEdge Expandable RAID Controller 3 Betriebsanweisung Seite 154

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154 Glossary
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
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
.
Stripe Element Size
The total disk space consumed by a stripe not including a parity disk. For
example, consider a stripe that contains 64 KB of disk space and has 16 KB of
data residing on each disk in the stripe. In this case, the stripe element size is
16 KB and the stripe size is 64 KB.
Striping
Disk striping writes data across all physical disks in a virtual disk. Each stripe consists
of consecutive virtual disk data addresses that are mapped in fixed-size units to each
physical disk in the virtual disk using a sequential pattern. For example, if the virtual
disk includes five physical disks, the stripe writes data to physical disks one through
five without repeating any of the physical disks. The amount of space consumed by
a stripe is the same on each physical disk. The portion of a stripe that resides on a
physical disk is a
stripe element
. Striping by itself does not provide data redundancy.
Striping in combination with parity does provide data redundancy.
Dell_PERC6.2_UG.book Page 154 Wednesday, June 24, 2009 6:08 PM
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