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Maintenance of RAID System

This chapter describes the maintenance of a RAID System using the Universal RAID Utility.

Providing Patrol Read for Physical Devices

The Patrol Read function reads data saved in all Physical Devices in a RAID System entirely to check whether a read

error occurs or not regularly in the background. The Patrol Read is effective to find failures including Physical Device

medium error early. Be sure to execute Patrol Read for a RAID Controller if it supports the Patrol Read.

The Universal RAID Utility provides the function of indicating whether Patrol Read is executed or not and the function of

changing the Patrol Read Priority.

If the Medium Error was detected frequently on the same Physical Device during execution of Patrol Read, Patrol Read is

automatically stopped to suppress deterioration of access performance to the Physical Device. When Patrol Read is

running on two or more RAID controllers, a target to be stopped Patrol Read is only the Physical Device on which

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

Some RAID Controller may not support the Patrol Read function

. In such environment

, [Patrol

Read] and [Patrol Read Priority

] are not displayed on RAID Viewer and raidcmd, and the

“

optctrl” command will fail.

Setting Whether Patrol Read Is Executed or Not

Whether Patrol Read is executed or not should be set in RAID Controllers. The procedure of setting whether

Patrol Read is executed or not is described below.

Changing the setting whether Patrol Read is executed or not is available only in the Advanced

Mode.

RAID Viewer

Step 1 Start the RAID Viewer. Click a RAID Controller on the Tree View. Then click [Properties] on the [File] menu.

Step 2 Click the [Options] tab in the [RAID

Controller Properties] dialog box. Change the value of

[Patrol Read] to [Enable] or [Disable]. Click [OK] or

[Apply].

raidcmd

Step 1 Execute "

optctrl

" command with -pr option

and the following parameters.

-c

: Number of the RAID Controller for which whether Patrol

Read is executed or not is set

-pr

: Specify "enable" to allow Patrol Read / Specify

"disable" not to allow Patrol Read.

Step 2 Check the execution result by using

property

" command. The following parameter of RAID

Controller is changed if the settings has been

changed successfully.

[Patrol Read] : "enable" to allow Patrol Read

"disable" not to allow Patrol Read

Ex. Browse the property of the RAID Controller 1.

raidcmd property -tg=rc -c=1

> raidcmd optctrl -c=1 -pr=enable

> raidcmd property -tg=rc -c=1

RAID Controller #1

ID : 0

Vendor : LSI Corporation

Model : LSI MegaRAID SAS 9267-8i

Firmware Version : 3.140.05-1294

Cache Size : 1,024MB

Premium Feature : CacheCade

Battery Status : Normal

Rebuild Priority : Middle

Consistency Check Priority : Low

Patrol Read : Enable

Patrol Read Priority : Low

Buzzer Setting : Disable

HDD Power Saving(Hot Spare): Enable

Device Standby Time : 30 minutes

1 2 ... 86 87 88 89 90 91 92 93 94 95 96 ... 143 144

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