Intel SRCU31, User Manual

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150 Intel RAID SRCU31 Users Guide
If an array build has begun, you can monitor the progress of the array build by clicking the right
mouse button on the host drive and then selecting progress information (logical_progress_info).
See Figure 89.
Figure 89. Array Build Information Dialog
Parity Verify
Click the right mouse button on the array drive icon.
RAID 4 and RAID 5 drives contain parity information, which is used in the event of drive failure.
The parity information is calculated from the user data on the disk array. On RAID 4 disk arrays
the parity data is stored on a single disk (parity disk), on RAID 5 disk arrays the parity data is
distributed over all drives (parity striping). This option verifies online the parity information of the
selected RAID 4 or RAID 5 array drive. If this option is selected for several array drives, the
processes are put into a queue and performed one after the other.
If a parity error is detected, find the reason for the data corruption. A good indication of data
corruption can be retries (terms_retry) on the SCSI bus. If the retry-counter shows high numbers,
this might be the problem. Possible reasons for parity error are bad cabling (terms_cabling),
termination (terms_termination) or hardware error from a defective drive or an overheated drive.
After removing the reason of the data corruption you can carry out parity recalculate
(logical_precalc) to ensure that the parity information of this disk array becomes valid.
Figure 90. Parity Verify