LSI MegaRAID Enterprise 1600 - Manual (Page 148)

MegaRAID Enterprise 1600 Hardware Guide 134
Glossary, Continued
SAF-TE SCSI Accessed Fault-Tolerant Enclosure. An industry protocol for managing RAID enclosures and
reporting enclosure environmental information.
SCSI (Small Computer System Interface) A processor-independent standard for system-level interfacing
between a computer and intelligent devices, including hard disks, floppy disks, CD-ROM, printers,
scanners, etc. SCSI can connect up to 7 devices to a single adapter (or host adapter) on the
computer's bus. SCSI transfers eight or 16 bits in parallel and can operate in either asynchronous
or synchronous modes. The synchronous transfer rate is up to 40 MB/s. SCSI connections
normally use single ended drivers, as opposed to differential drivers. The original standard is now
called SCSI-1 to distinguish it from SCSI-2 and SCSI-3, which include specifications of Wide
SCSI (a 16-bit bus) and Fast SCSI (10 MB/s transfer).
SCSI Channel MegaRAID controls the disk drives via SCSI-2 buses (channels) over which the system transfers
data in either Fast and Wide or Ultra SCSI mode. Each adapter can control up to three SCSI
channels.
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’s database
and passes it to management applications as requested.
SMARTer Self-Monitoring, Analysis, and Reporting Technology with Error Recovery. An industry standard
protocol for reporting server system information. Self-Monitoring, Analysis and Reporting
Technology for disk drives is a specification designed to offer an early warning for some disk drive
failures. These failures are predicted based upon actual performance degradation of drive
components that are then reported through a graphical interface.
SNMP Simple Network Management Protocol is the most widely used protocol for communication
management information between the managed elements of a network and a network manager. It
focuses primarily on the network backbone. The Internet standard protocol developed to manage
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, 3, and 5 to RAID levels 10, 30, and 50, respectively. See also Disk Spanning and
Spanning.
Spare A hard 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 2 KB, 4 KB,
8 KB, 16 KB, 32 KB, 64 KB, and 128 KB for each logical drive. For best performance, choose a
stripe size equal to or smaller than the block size used by the host computer.
Cont’d