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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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Power Failure Protection

Power Failure Protection

Power Failure Protection

Since writing to high-speed cache is faster than to hard drives, enabling cache greatly improves write performance. Whenever write pressure lowers or cache is nearly full, data is migrated from the cache to hard drives.

However, caching increases the risk of data loss, such as during unexpected server power off. To prevent this, configure a supercapacitor for the controller, which supplies power and NAND flash of the supercapacitor protection module for writing cache data in the event of a power failure.

Supercapacitor Power Calibration

Data protection requires supercapacitors. The automatic power calibration mode is enabled by default for RAID controller cards to record supercapacitor discharge curves to monitor supercapacitor status, such as maximum and minimum voltages, and extend supercapacitor lifespans.

RAID controller cards calibrate power in the following process to ensure power stability:

  1. RAID controller cards charge supercapacitors with maximum power.
  2. The calibration process automatically starts and fully discharges the supercapacitors.
  3. RAID controller cards charge the supercapacitors again to their maximum power.

During the calibration process, the write policy of the controller card is automatically changed to WT to ensure data integrity, and the controller card performance decreases accordingly. The power calibration cycle depends on the supercapacitor discharge speed.

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Updated: 2019-11-01

Document ID: EDOC1000004186

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