LSI 3ware SAS 9750-8i Guide de l'utilisateur télécharger pdf (Page 168)

Maintaining Units

156 3ware SATA+SAS RAID Controller Card Software User Guide, Version 10.0

What Verification Does

For a RAID 1 or RAID 10 unit, a verify compares the data of one mirror with

the other. For RAID 5, RAID 6, and RAID 50, a verify calculates parity and

compares it to what is written on the disk drive. For non-redundant units, it

performs a media scan.

Verification checks each sector on a drive. This is important, because day-to-

day use of the media may leave many sectors on a drive unused or unchecked

for long periods of time. This can result in errors occurring during user

operation. Periodic verification of the media allows the disk drive firmware to

take corrective actions on problem areas on the disk, minimizing the

occurrence of uncorrectable read and write errors.

Verifies can be performed through either 3BM (BIOS) or through 3DM. In

addition, they can be scheduled to run at preferred times, through 3DM or

through the CLI, or can be run automatically during the Verify schedule

window, if scheduling and the Auto Verify feature are enabled.

Verification of Non-Redundant Units

Verification of non-redundant units (single disks, spares, and RAID 0 units)

read each sector of a drive, sequentially. If a sector can’t be read, it is flagged

as unreadable, and the next time the controller writes to that location, the

drive reallocates the data to a different sector.

Verification of Redundant Units

Verification of redundant units reads each sector, working from lowest block

to highest block. If verification cannot read data in a sector, dynamic sector

repair is used to recover the lost data from the redundant drive or drives; this

recovered data is written to the problem sector. This forces the drive to

reallocate the defective sector with a good spare sector.

If the verify unit process determines that the mirrored drives are not identical

or the parity is not correct, the error is corrected. For RAID 1 and 10, this

involves copying the miscompared data from the lower port(s) to the higher

port(s) of the mirror. For RAID 5, RAID 6, and RAID 50, this involves

recalculating and rewriting the parity that was incorrect. AEN 36 (

“Verify

detected and fixed data/parity mismatch”

) is posted to the Alarms page.

Note: Not verifying the unit periodically can lead to an unstable unit and may cause

data loss.

It is strongly recommended that you schedule a verify at least 1 time per week. You

can take advantage of the the Auto Verify and Basic Verify Schedule to accomplish

this.

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LSI 3ware SAS 9750-8i Guide de l'utilisateur Page 168

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