LSI 3ware SAS 9750-8i User's Guide download pdf (Page 169)

Background Tasks

www.lsi.com/channel/products 157

For RAID 1 and 10, verification involves copying the data from the lower

port(s) to the higher port(s) of the mirror. For RAID 5 and RAID 50, this

involves recalculating and rewriting the parity for the entire unit. If the unit is

not redundant, a file-system check is recommended to correct the issue. If the

errors persist and cannot be overwritten from a backup copy, perform a final

incremental backup. You will need to replace the defective drive, recreate the

unit, and reinstall the data.

How Errors Are Handled

Verification makes use of the same error checking and error repair techniques

used during ordinary use of drives configured through 3ware RAID

controllers.

When verification encounters an error, the controller typically retries the

command. If there are cable CRC errors, there may be multiple retries

including downgrade of the UDMA mode. If the error persists and is

unrepairable (e.g., ECC errors), an error notification is issued to indicate the

problem. (See AEN “0026 Drive ECC error reported” on page 263.)

If the disk drive is part of a redundant unit that is in a redundant state (not

degraded or rebuilding), then Dynamic Sector Repair automatically rewrites

the redundant data to the error location to force the drive to reallocate the

error location. A notification of repair is posted to the alarms list. The result is

a restoration of drive and data integrity; the primary and redundant data are

again both valid.

If the unit is not redundant, it is recommended that you perform a file-system

check to correct the issue. Under Windows, you can do this by right-clicking

on the Drive and choosing Properties; then on the Tools tab, click Check Now.

If the errors persist and cannot be overwritten from a backup copy, perform a

final backup of files that have changed since your last backup. You will need

to replace the defective drive, recreate the array, and reinstall the data.

Using Auto Verification

Auto Verify is available as a unit policy that can help insure that a unit is

verified on a regular basis. This is important, as it can provide early warning

of unstable units and possible data loss.

Auto Verify is enabled on a per-unit basis, and works in conjunction with the

Verify Schedule, which is set on a controller-wide basis. Two verify schedules

settings are available (Basic and Advanced), and Auto Verify works

differently, depending on which is selected.

The Basic Verify schedule (enabled, by default), provides a weekly day and

time for Auto Verify to occur. When the Basic schedule is used, Auto Verify

will start a verify at the designated time, and run until it has finished.

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LSI 3ware SAS 9750-8i User's Guide Page 169

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