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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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Cache Data Read/Write

Cache Data Read/Write

To improve the data read/write performance, the following policies are supported:

  • Read Ahead or Ahead: The controller card caches the data that follows the data being read for faster access. This policy reduces drive seeks and shortens read time.

    To achieve optimal disk performance, set the policy to Read Ahead or Ahead for HDDs and No Read Ahead or Normal for SSDs.

  • Write Back: After the cache receives host data, the controller card signals the host that the data transmission is complete.

    Data is directly written to the cache. The controller card then updates accumulated cache data to hard drives in batches. Overall data write speed is higher since writing to the cache is faster than writing to the hard drive.

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Updated: 2019-11-01

Document ID: EDOC1000004186

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