Cisco UCS C220 M3 Посібник з конфігурації - Сторінка 4

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RAID 0

RAID 0 provides disk striping across all the drives in the RAID drive group. RAID 0 does not provide any data

redundancy, but it offers the best performance of any RAID level. RAID 0 divides data into smaller segments and

then stripes the data segments across each drive in the drive group. The size of each data segment is determined

by the stripe size. RAID 0 offers high bandwidth.

RAID 0 is excellent for applications that require high bandwidth but do not require fault tolerance. Table 1 provides

an overview of RAID 0. Figure 2 shows an example of RAID 0 use.

Table 1.

RAID 0

Uses

Advantages

Limitations

Drives

Figure 2.

In RAID 1, the RAID controller duplicates all the data from one drive to a second drive in the drive group. RAID 1

supports an even number of drives from 2 through 32 in a single span. It provides complete data redundancy, but

at the cost of doubling the required data storage capacity.

RAID 1 is excellent for environments that require fault tolerance and have small capacity. Table 2 provides an

overview of RAID 1. Figure 3 shows an example of RAID 1 use.

Table 2.

RAID 1

Uses

Advantages Provides complete data redundancy

Limitations

Drives

RAID 0

● Provides high data throughput, especially for large files

● Good for any environment that does not require fault tolerance

● Provides increased data throughput for large files

● No capacity loss penalty for parity

● Does not provide fault tolerance or high bandwidth

● All data is lost if any drive fails

1 through 32

RAID 0 Drive Group with Two Drives

RAID 1

Good for small databases or any other environment that requires fault tolerance but has low

capacity

Requires twice as many drives

2 through 32 (must be an even number of drives)

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