Cisco UCS C220 M3 Manuale di configurazione - Pagina 9

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Table 7.

RAID 50

Uses

Advantages Provides high data throughput, data redundancy, and very good performance

Limitations

Drives

Figure 8.

RAID 60

RAID 60 provides the features of both RAID 6 and RAID 0 (6 + 0) and includes both parity and disk striping across

multiple drive groups. RAID 6 supports two independent parity blocks per stripe. A RAID 60 virtual drive can

survive the loss of two drives in each of the RAID 6 sets without losing data. RAID 60 is best implemented on two

RAID 6 drive groups, with data striped across both drive groups.

RAID 60 divides data into smaller blocks, calculates parity by performing an exclusive-or operation on the blocks,

and then writes the blocks of data and parity to each drive in the drive group. The size of each block is determined

by the stripe size parameter, which is set during the creation of the RAID set.

RAID 60 can support up to eight spans and tolerates up to 16 drive failures, though less than the total drive

capacity is available. Two drive failures can be tolerated in each RAID 6 drive group.

RAID 60 is excellent for environments that require a very high level of protection from loss and that have high read

request rates but low write request rates. Table 8 provides an overview of RAID 60. Figure 9 shows an example of

RAID 60 use.

RAID 50

Appropriate when used with data that requires high reliability, high request rates, high data transfer, and medium-

sized to large capacity

Requires 2 to 8 times as many parity drives as RAID 5

8 spans of RAID 5 drive groups containing 3 through 32 drives each (limited by the maximum number of devices

supported by the controller)

RAID 50 Drive Group

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