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请教下scu的问题~
刚接触了hp的z820工作站，发现主板上好多sata口外观，但是标注的是scu这是什么啊？
关键是scu接口插蓝光刻录光驱，只能识别为dvd刻录机。插到ahci上一切正常，驱动都装上没问题了。
scu这接口有什么特殊用法吗？
网上也没找到详细的介绍
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SCU means Storage Control Unit
SCUs support SAS drives with HDD enable module installed
SCUs do not support Optical Drives
There is no practical performance advantage when using SCU
Intel PCH supports two types of RAID controllers: AHCI and SCU
The thing listed as PCH is the normal AHCI mode.
The AHCI controller supports SATA drives and the SCU controller supports both SATA and SAS drives (Exceptions exist, like the SCU controller for PCH C602 that supports SATA only).
What's important to remember is never to put ODDs on SCU. You have to put any Optical Drives on the normal AHCI (the I-SATA).
If you do use ODDs, put them on I-SATA and the hard drives on S-SATA (for a RAID up to 4).
If you do not use ODDs and you use normal SATA hard drives or SATA SSDs, it won't matter. In this case, you will be able to RAID up to 6 drives with the I-SATA and up to 4 with the S-SATA.
Conclusion: no speed difference.
https://serverfault.com/questions/838578/s-sata-vs-i-sata-pch-scu
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多谢~原来明确写明不支持光驱……
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