3Ware 9550SXU-16ML User Guide - Page 196

Verifying Units

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Chapter 9. Maintaining Units Verifying Units For redundant units, verify checks the redundancy of the unit. For example it will check parity for a RAID 5 or check data consistency for a RAID 1. If the unit you checked is not a redundant unit, verify performs a surface scan of the media. During verification, I/O continues normally, but with a slight performance loss, depending on your verify rate setting. For more details about how verification works, see "About Verification" on page 172. For details about verify rates, see "Setting Background Task Rate" on page 175. For 9000 series controllers, 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 this involves recalculating and rewriting the RAID 5 parity that was incorrect. AEN 36 ("Verify detected and fixed data/parity mismatch") is posted to the Alarms page. When this occurs for 7000/8000 series controllers, AEN 36 ("Verify detected and fixed data/parity mismatch") is logged and the entire unit is initialized. For RAID 1 and 10, initialization involves copying the data from the lower port(s) to the higher port(s) of the mirror. For RAID 5 this involves recalculating and rewriting the RAID 5 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. Note: If the unit has not previously been initialized and you manually select Verify Unit in either 3BM or 3DM, the initialization process starts. Verification of units can be done automatically, on a schedule, or can be started manually, as described below. For information about scheduling, see "Scheduling Background Tasks" on page 176. You can manually start a verify through either 3DM or 3BM. as described below. 186 3ware 9550SX Serial ATA RAID Controller User Guide

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Chapter 9. Maintaining Units
186
3ware 9550SX Serial ATA RAID Controller User Guide
Verifying Units
For redundant units, verify checks the redundancy of the unit. For example it
will check parity for a RAID 5 or check data consistency for a RAID 1. If the
unit you checked is not a redundant unit, verify performs a surface scan of the
media. During verification, I/O continues normally, but with a slight
performance loss, depending on your verify rate setting. For more details
about how verification works, see “About Verification” on page 172. For
details about verify rates, see “Setting Background Task Rate” on page 175.
For 9000 series controllers, 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 this
involves recalculating and rewriting the RAID 5 parity that was incorrect.
AEN 36 (
“Verify detected and fixed data/parity mismatch”
) is posted to
the Alarms page.
When this occurs for 7000/8000 series controllers, AEN 36 (
“Verify
detected and fixed data/parity mismatch”
) is logged and the entire unit is
initialized. For RAID 1 and 10, initialization involves copying the data from
the lower port(s) to the higher port(s) of the mirror. For RAID 5 this involves
recalculating and rewriting the RAID 5 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.
Note:
If the unit has not previously been initialized and you
manually select
Verify Unit
in either 3BM or 3DM, the
initialization process starts.
Verification of units can be done automatically, on a schedule, or can be
started manually, as described below. For information about scheduling, see
“Scheduling Background Tasks” on page 176.
You can manually start a verify through either 3DM or 3BM. as described
below.