> There's one multi-color (3-prong) LED responsible for this. Nominally, 
> green should mean drive running and okay, alternating red should mean 
> transfer, and orange (red + green) a disk failure. In case of 7200.11's 

there's a standard for this
red     fail
orange  locate
green   activity

maybe you're enclosure's not standard.

> I tried changing the bay in which the disk sits and the anomaly follows the 
> disk so I guess the backplane's okay.

since it's a single led and follows the drive, i think this is a voltage 
problem.
it just has to do with the fact that the voltage / pullup standard
changed.

> Um, I don't have that because I don't have any running Plan 9 instances, 
> but I'll try finding it on the web (if it's been through man2html at some 
> time).

http://sources.coraid.com/sources/contrib/quanstro/root/sys/man/3

- erik

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