2025-03-04

Understanding server raid cards

Understanding server raid cards

Raid card: The full name is Redundant Array of Independent Disks Card. It uses Raid technology to turn multiple hard disks into one logical disk, with better capacity, performance, reliability, and manageability

SAS card: It is positioned as a low-end hard disk array expansion card. Compared with Raid cards, it has obvious gaps in terms of no cache, Raid level 0, 1, and performance.

Onboard raid: refers to the SATA controller integrated in the PCH of the server motherboard, which usually only supports SATA disks, has no cache, poor performance, and has limitations.

The CPU of the RAID card implements the functions of the RAID card by executing the firmware in the flash memory to control the SCSI controller, CacheMemory, and the indication alarm circuit. The operation process is as follows:

1. Initialize the RAID card register

2. Read the last RAID parameters in NVRAM, compare with the actual hard disk information to display the results

3. Send configuration prompts, respond to HOST commands to enter the configuration interface

4. Provide a configuration menu, and store the RAID card parameters and RAID parameters provided by the user in NVRAM

5. According to the RAID parameters, initialize the hard disk write operation through the SCSI controller

6. Complete the configuration and wait for the Host to issue a read and write operation command

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