Acer Altos T350 F2 Faq page 56

Altos T350 F2 FAQ (Frequently Asked Questions)
6. What's the benefit if the HDD Access LED is driven by PIN 11 (P11) of SATA HDD?
ANSWER: Some SAS/SATA RAID controller does not support SGPIO (Serial General Purpose
Input/Ouput) protocol. Hence, HDD Access LED won't function (blink) if the SGPIO based
SAS disk cage is connected to the RAID controller without SGPIO support.
With HDD Access LED driven by PIN 11 (P11) of SAS/SATA HDD, the HDD Access LED would work
independent of SAS/SATA RAID controller.
However, the HDD failure and RAID rebuilt LED are still driven by SGPIO.
7. Is a SAF-TE (I2C) cable required for SAS back-plane LED control?
ANSWER: No. Altos T350 F2 SAS backplane does not support SAF-TE (SCSI Access Fault Tolerance
Enclosure). The LED control of back-plane is through SGPIO.
8. Is there any SGPIO cable that I should connect if the RAID controller supports SGPIO?
ANSWER: The signal of SGPIO is included in the bridge board. There is no additional SGPIO
cable required.
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