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Huawei V2 and V3 Server RAID Controller Card User Guide 36

This document describes the appearances and features of the redundant array of independent disks (RAID) controller cards, how to configure properties for the RAID controller cards, and how to install drivers. The RAID controller cards include the LSI SAS2208, LSI SAS2308, LSI SAS3008, LSI SAS3108, LSI SoftRAID, PM8060, and PM8068.
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Write Hole Protection

Write Hole Protection

Write hole occurs when a system or power failure interrupts data writing but does not cause write failure. Certain stripes and even parity data change to uncertainty status, and prevent data writing to these stripes.

Write hole is solved by storing write failure data in the power failure protection zone and rewriting the data where possible.

  • Write hole protection is only supported for RAID 5, 6, and 50. Write hole data is stored and write hole protection is automatic.
    • Available power failure protection device: write hole data is recovered on restart.
    • Unavailable power failure protection device: write hole data is lost on restart.
  • When a drive of RAID 6 goes offline, write hole protection is supported.
  • When RAID 50 is partially degraded, write hole protection is supported and data will be restored by span. When RAID 50 is fully degraded, write hole protection is not supported.
Updated: 2019-11-01

Document ID: EDOC1000004186

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