LSI 3ware SAS 9750-8i Guia do Utilizador descarregar pdf (Página 165)

Background Tasks

www.lsi.com/channel/products 153

Although you can use the unit while it is being initialized in the background,

initialization does slow I/O performance until completed. You can adjust how

much initialization will slow performance by setting the rate at which it

occurs. (See “Setting Background Task Rate” on page 168.) You can also

postpone initialization until a scheduled time. (See “Scheduling Background

Tasks” on page 169).

Initialization of Different RAID Types

Information about initialization for each of the different RAID types is

described below and summarized in Table 12 on page 154.

Initialization of RAID 0 Units

RAID 0 units do not need to be initialized and cannot be initialized. RAID 0

units are immediately available for use with full performance when created.

Initialization of RAID 5, RAID 6, and RAID 50 Units

RAID 5 units with three or four drives will be automatically initialized the

first time they are verified.

Regardless of the size, all 9000-series RAID 5, RAID 6, and RAID 50 units

are fully fault tolerant upon creation. These configurations use a specialized

scheme for writing to the unit, which does not have to be valid to provide fault

tolerance.

Performance of the following types of units will improve after the unit has

been initialized: RAID 6, RAID 5 units with 5 or more disks, and RAID 50

units with 2 subunits of 5 or 6 disks. For these configurations, initialization

begins automatically after you create them. If you create them in 3BM using

the default foreground initialization method, zeroes are written to all unit

members before booting to the operating system. If you create them through

3DM, you will boot to the operating system and the RAID 5 parity is then

calculated and written to disk, keeping any data in the unit intact.

RAID 5 units with 3 or 4 disks do not need to be initialized to have full

performance upon creation. It is okay that 3 or 4 disk RAID 5 units are not

initialized. These RAID types are fully redundant, regardless of whether or

not they are initialized. Similarly, RAID 50 units with a grouping of 3 or 4

disks in a subunit do not need to be initialized. However, RAID 50 with a

Note: Units that do not need to be immediately initialized for full performance will

be automatically initialized using background initialization when they are verified for

the first time. (Verification requires that the units have been previously initialized.)

This will not affect the data on the drives, and the units will perform normally,

although performance will be slowed until the initialization and verification are

completed.

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LSI 3ware SAS 9750-8i Guia do Utilizador Página 165

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