Cisco UCS C220 M3 Konfigurationshandbuch - Seite 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.
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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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