NEC Express5800/R120f-1M Guia do Utilizador descarregar pdf (Página 93)

Checking Logical Drive Consistency

The Consistency Check function checks the consistency between the data in the data area of a Logical Drive and the

parity. The Universal RAID Utility can start or stop Consistency Check and change the priority in which Consistency

Check is executed.

The Consistency Check is effective next to Patrol Read to find failures including Physical Device medium error early.

Execute Consistency Check periodically if the RAID Controller does not support Patrol Read or the Patrol Read is

disabled. If the Universal RAID Utility is installed, routine execution of the Consistency Check is set for RAID Controllers

not supporting Patrol Read.

Consistency Check is executed for each Logical Drive.

If the Medium Error was detected frequently on the same Physical Device during the execution of Consistency Check,

Consistency Check is automatically stopped to suppress deterioration of access performance to the Physical Device.

When Consistency Check is running on two or more Logical Drives, a target to be stopped Consistency Check is only the

Logical Drive that includes the Physical Device on which Medium Error was detected frequently.

If you want to execute Consistency Check through entire Logical Drive even if Medium Error is detected frequently, use

the raidcmd with “Automatic Stop Disabled” option.

See the section “Monitoring a Medium Error to see if they occur frequently”.

Starting or stopping the Consistency Check is enabled both in the Standard Mode and

Advanced Mode. The function of changing the priority at which the Consistency Check is

executed is available only in the Advanced Mode.

When you execute Consistency Check with “Automatic Stop Disabled”, please don't reboot

the system and the raidsrv service restart. See the section “Executing Consistency Check

Manually (Automatic Stop Disabled)”.

When Universal RAID Utility fell into a state where it cannot continue to operate for the target

Logical Drive (For example, the Logical Drive is Degenerate), Consistency Check will be

stopped regardless of “Automatic Stop Enabled” or “Automatic Stop Disabled” mode.

If you using N8103-176/177/178/179 RAID Controller, when you reboot a system during

consistency check a RAID Controller is different from movement of a conventional RAID

Controller. 5 minutes after RAID Controller start, a consistency check is resumed.

The Consistency Check can be executed only for Logical Drives with [Status] being [Online].

The Consistency Check cannot be executed for

Logical Drives with RAID Level being RAID 0.

Executing Consistency Check Manually (Automatic Stop

Enabled)

Consistency Check is executed in Logical Drives. The procedure of starting Consistency Check is described

below.

If the Medium Error was detected

frequently on the Physical Device, Consistency Check is

automatic

ally stopped to suppress deterioration of access performance to the Physical

Device.

RAID Viewer

Step 1 Start the RAID Viewer. Click a Logical Drive

on the Tree View. Then click [Start Consistency Check]

->[Automatic Stop Enabled] on the [Control] menu.

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