From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <115c849c213188cc8e3d7b67b6c7ae6d@quanstro.net>
From: erik quanstrom <quanstro@quanstro.net>
Date: Fri,  4 Sep 2009 08:41:17 -0400
To: 9fans@9fans.net
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Subject: Re: [9fans] Petabytes on a budget: JBODs + Linux + JFS
Topicbox-Message-UUID: 6416717c-ead5-11e9-9d60-3106f5b1d025

> This caught my attention and you are the storage expert here. Is there an
> equivalent technology on SATA disks for controlling enclosure facilities?
> (Other than SMART, I mean, which seems to be only for monitoring and not
> for control.)

SES-2/SGPIO typically interact with the backplane, not the drive itself.
you can use either one with any type of disk you'd like.

> I have this SATA backplan-inside-enclosure with 3x Barracuda 7200 series 1
> TB disks attached. The enclosure lights for the two 7200.11's respond the
> right way but the one that's ought to represent the 7200.12 freaks out
> (goes multi-color). Have you experienced anything similar? The tech at the
> enclosure vendor tells me some Seagate disks don't support control of
> enclosure lights.

not really.  the green (activity) light is drive driven and sometimes
doesn't work due to different voltage / pull up resistor conventions.
if there's a single dual-duty led maybe this is the problem.  how
many sepearte led packages do you have?

the backplane chip could simply be misprogrammed.  do the lights
follow the drive?  have you tried resetting the lights.

if you have quanstro/sd installed, sdorion(3) discusses how it
controls the backplane lights.

- erik