Справочник Пользователя для IBM Flex System V7000 Expansion Enclosure 4939H29

Chapter 8. Storage pools 

Draft Document for Review January 29, 2013 12:52 pm

When creating RAID arrays for the internal drives in IBM Flex System V7000 Storage Node 
performance and protection against drive failures are important factors to consider. Using the 
recommended configuration generally builds RAID arrays using RAID 5 which gives good 
performance with as many drives utilized as possible. 

A client or storage administrator may have the need for either higher performance or for more 
tolerance against failing drives. In such cases you would not use the recommended 
configuration, but would rather choose a configuration which is optimized for performance as 
shown in “Selecting a different configuration” on page 308.

As shown in Figure 8-12 on page 306, when you click Use the recommended 
configuration, the wizard offers a recommended storage configuration at the bottom of the 
window.

Basic 
RAID 5

Protects against a single drive 
failure. Data and one stripe of 
parity are striped across all 
array members.

5

8

1

All drives in the array 
are from the same 
chain wherever 
possible.

Basic 
RAID 6

Protects against two drive 
failures. Data and two stripes 
of parity are striped across all 
array members.

6

12

1

All drives in the array 
are from the same 
chain wherever 
possible.

Basic 
RAID 10

Protects against at least one 
drive failure. All data is 
mirrored on two array 
members.

10

8

1

All drives in the array 
are from the same 
chain wherever 
possible.

Balanced 
RAID 10

Protects against at least one 
drive or enclosure failure. All 
data is mirrored on two array 
members. The mirrors are 
balanced across the two 
enclosure chains.

10

8

1

Exactly half of the 
drives are from each 
chain.

RAID  0

Provides no protection against 
drive failures. 

0

8

0

All drives in the array 
are from the same 
chain wherever 
possible.