LSI 3ware SAS 9750-8i Guia do Utilizador descarregar pdf (Página 321)

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during configuration. The stripe size is user-configurable at 64 KB, 128

KB, or 256 KB.

This stripe size is sometimes referred as a “minor” stripe size. A major

stripe size is equal to the minor stripe size times the number of disks in the

unit.

•

Striping. The process of breaking up files into smaller sizes and

distributing the data amongst two or more drives. Since smaller amounts

of data are written to multiple disk drives simultaneously, this results in

an increase in performance. Striping occurs in RAID 0, 5, 6, 10 and 50.

•

Subunit. A logical unit of storage that is part of another unit. For

example, the mirrored pairs (RAID 1) in a RAID 10 unit are subunits of

the RAID 10 unit.

•

Unit ID. A unique identifier for a specific unit in a system.

•

Unit Number. The SCSI number, or channel number, of a particular unit.

•

Unit. A logical unit of storage, which the operating system treats as a

single drive. A unit may consist of a single drive or several drives. Also

known as an array.

•

Verify. A process that confirms the validity of the redundant data in a

redundant unit. For a RAID 1 and RAID 10 unit, a verify will compare the

data of one mirror with the other. For RAID 5, RAID 6, and RAID 50, a

verify will calculate RAID 5 parity and compare it to what is written on

the disk drive.

•

VPort. The 3ware 9750 RAID controller has 96 addresses available to

assign to hard drives. These addresses are known as virtual port (vport)

IDs. By using vport IDs and expanders, one controller phy can connect to

multiple drives. This is in contrast to standard port connections which are

one-to-one physical connections.

•

Wide Port. A SAS port can consist of one or more phys. When a SAS

port consists of one phy it is known as a narrow port, when it contains

multiple phys it is known as a wide port. The 3ware 9750 controller has

two wide port connectors that contain 4 phys each. These phys can

function individually, in which case each phy has its own SAS address, or

the 4 phys can be banded together, in which case they share the same SAS

address. A 9750 wideport can have a bandwidth of up to 12.0 Gbps.

•

WWN (World Wide Number). The unique worldwide 64-bit SAS address

assigned by the manufacturer to each SAS port and expander device in the

SAS domain. Many SAS drives have 2 ports and thus 2 WWNs.

•

Write Cache. When write cache is enabled, data will be stored in

controller cache and drive cache before the data is committed to disk.

This allows the system to process multiple write commands at the same

time, thus improving performance.

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LSI 3ware SAS 9750-8i Guia do Utilizador Página 321

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