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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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Drive Striping

Drive Striping

Multiple processes accessing a drive at the same time may cause drive conflicts. Most drives have a threshold for the access count (I/O operations per second) and data transmission rate (data volume transmitted per second), above which new access requests are suspended.

Striping technology evenly distributes I/O loads across multiple physical drives. It divides continuous data into multiple blocks and saves them to different drives. This allows multiple processes to access these data blocks without conflicts. Striping also optimizes concurrent processing performance in sequential access to data.

Drive striping is to divide the space of a drive into multiple strips based on the specified strip size. When data is written into the drive, the data is divided into data blocks based on the strip size.

Take a disk system (such as RAID 0) consisting of four member drives as an example. The first data block is written into the first member drive, the second data block is written into the second member drive, and so on, as shown in Figure 3-1. In this way, multiple drives are concurrently written, significantly improving system performance. However, data redundancy is not guaranteed by drive striping.

Figure 3-1 Drive striping example

Drive striping involves the following concepts:

  • Strip width: indicates the number of drives in a drive group used for striping. For example, for a drive group consisting of four member drives, the strip width is 4.
  • Strip size of a drive group: indicates the total size of data blocks that the RAID controller card concurrently writes into all drives in a drive group.
  • Strip size of a drive: indicates the size of a single strip on a single drive.

Example: Assume that when a 1 MB data strip is written into a drive group, a 64 KB data block is allocated to each member drive. Then, the strip size of the drive group is 1 MB, and the strip size of a drive is 64 KB.

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Updated: 2019-11-01

Document ID: EDOC1000004186

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