LSI 3ware SAS 9750-8i Guia do Utilizador descarregar pdf (Página 167)

Background Tasks

www.lsi.com/channel/products 155

Background Initialization After Power Failure

The 3ware controller detects and handles power failures, using a mechanism

that ensures that redundant units have consistent data and parity. When a

redundant unit is unexpectedly shutdown, there is a possibility some data and

parity may be inconsistent. If a unit or sub-unit of a redundant unit is detected

to have been shutdown uncleanly, the unit or sub-unit will change its mode to

either ‘Initializing’ or ‘Verifying.’

When the initialization is complete, the unit is guaranteed to be redundant

again. The initialization does not erase user data.

This process will take less time if the unit is created with Rapid RAID

Recovery enabled during unit creation. See “Rapid RAID Recovery” on

page 121.

About Verification

The verify feature confirms the validity of redundant data on redundant units

and performs media scans on non-redundant units.

Regular weekly verification is a good idea, as it can provide early warning of

a disk drive problem or failure. This allows you to replace drives before they

fail.

You can start a verify manually or regular verification can be done

automatically by enabling Auto Verify. (See “Starting a Verify Manually” on

page 158 and “Using Auto Verification” on page 157.)

During verification, I/O continues normally, but with a slight performance

loss, depending on your verify rate setting. You can adjust how much

verification will slow performance by setting a rate at which it occurs. (See

“Setting Background Task Rate” on page 168.) You can also postpone

verification until a scheduled time. (See “Scheduling Background Tasks” on

page 169.)

Yes RAID 5 with 5 or more disks

RAID 6

RAID 50 with subunits of 5 or more disks

Table 12: Initialization Requirements for Different RAID

Configurations

Initialization Required

for Highest

Performance?

RAID Configurations

1 2 ... 162 163 164 165 166 167 168 169 170 171 172 ... 341 342

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LSI 3ware SAS 9750-8i Guia do Utilizador Página 167

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