Service Provider

The Service Provider (SP) is a program that resides in the desktop system or server and is responsible for all DMI activities. This layer collects management information from products (whether system hardware, peripherals, or software), stores that information in the DMI database, and passes it to management applications as requested.

SNMP

Simple Network Management Protocol. The most widely used protocol

 

for communicating management information between the managed

 

elements of a network and a network manager. SNMP focuses primarily

 

on the network backbone. The Internet standard protocol that manages

 

nodes on an Internet Protocol (IP) network.

Spanning

Array spanning by a logical drive combines storage space in two arrays

 

of disk drives into a single, contiguous storage space in a logical drive.

 

MegaRAID logical drives can span consecutively numbered arrays that

 

each consist of the same number of disk drives. Array spanning

 

promotes RAID levels 1 and 5 to RAID levels 10 and 50, respectively.

 

See also Disk Spanning.

Spare

A disk drive available to back up the data of other drives.

Stripe Size

The amount of data contiguously written to each disk. You can specify

 

stripe sizes of 4, 8, 16, 32, 64, and 128 Kbytes for each logical drive. For

 

best performance, choose a stripe size equal to or smaller than the block

 

size used by the host computer.

Stripe Width

The number of disk drives across which the data is striped.

Striping

Segmentation of logically sequential data, such as a single file, so that

 

segments can be written to multiple physical devices in a round-robin

 

fashion. This technique is useful if the processor can read or write data

 

faster than a single disk can supply or accept it. While data is being

 

transferred from the first disk, the second disk can locate the next

 

segment. Data striping is used in some modern databases and in certain

 

RAID devices.

Terminator

A resistor connected to a signal wire in a bus or network for impedance

 

matching to prevent reflections—for example, a 50 ohm resistor

 

connected across the end of an Ethernet cable. SCSI buses and some

 

LocalTalk wiring schemes also require terminators.

C-8Glossary

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