Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

On a Supermicro SuperServer SYS-1026TT-TF

when I boot Ubuntu 11.10 Oneiric

on the last 2 drives the red LED is blinking indicating hardware RAID rebuild

but hardware RAID is disabled

very similar to this :

What can I do to make these LED to stop blinking and work as expected ?

User's manual :

share|improve this question
Have you disconnected the sideband cable as described on that page? – Robin Gill Mar 6 '12 at 22:38
I don't have the same model and so can't do the same thing. Also everything works fine on Debian and Gentoo – Doud Mar 6 '12 at 23:09

The 1026TT-TF is based on an SC809 chassis (PDF manual). Checkout Appendix C for information on the backplane, you'll have the "TQ" version with SAS support and the chassis management chip, not the "T" version*.

Check all of the cables running in to the backplane in each compute node and compare them with the diagram on page C-3. You should have a 4-pin power connector plugged in to the top, and four SATA/SAS cables connected. The 10-pin header next to the 4-pin power connector is connected to your RAID card or to the motherboard, that'll be the sideband cable that the FAQ speaks of.

You may also try a reset of the controller chip as documented on page C-6, though I have no idea if it could be contributing to the problem.

*: This manual is only for the "T" chassis. The letters after the numbers but before the dash indicate the type of drives the chassis takes. "TQ" means SAS/SATA hot-swap, while "T"s usually don't have SAS support. We're lucky enough to have the "T" manual cover both the "T" and "TQ" backplanes.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.