Dell OpenManage Server Administrator Managed Node for Fluid Cache for DAS Manual do Utilizador descarregar pdf (Página 43)

100

101

Understanding RAID Concepts 43

RAID 5 Characteristics:

• Groups

disks as one large virtual disk with a capacity of (

-1) disks.

• Redundant information (parity) is alternately stored on all disks.

• When a disk fails, the virtual disk still works, but it is operating in a

degraded state. The data is reconstructed from the surviving disks.

• Better read performance, but slower write performance.

• Redundancy for protection of data.

Related Information:

• Organizing Data Storage for Availability and Performance

• Comparing RAID Level and Concatenation Performance

• Controller-supported RAID Levels

• Number of Physical Disks per Virtual Disk

• Maximum Number of Virtual Disks per Controller

RAID Level 6 (Striping with additional distributed parity)

RAID 6 provides data redundancy by using data striping in combination with

parity information. Similar to RAID 5, the parity is distributed within each

stripe. RAID 6, however, uses an additional physical disk to maintain parity,

such that each stripe in the disk group maintains two disk blocks with parity

information. The additional parity provides data protection in the event of

two disk failures. In Figure 3-5, the two sets of parity information are

identified as P and Q.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 389 390

Comentários a estes Manuais

Sem comentários

Dell OpenManage Server Administrator Managed Node for Fluid Cache for DAS Manual do Utilizador Página 43

Comentários a estes Manuais

Manuais e produtos relacionados com Placa-mãe para servidores/estações de trabalho Dell OpenManage Server Administrator Managed Node for Fluid Cache for DAS