Re: understanding the sg_ses --raw output? so I can turn on the faulty light

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On Tue, 2011-02-08 at 13:55 +0100, Jon Bendtsen wrote:
> On 07/02/11 16.40, James Bottomley wrote:
> > On Mon, 2011-02-07 at 16:25 +0100, Jon Bendtsen wrote:
> >> Hi
> >>
> >> There has earlier been 2 threads on sg_ses 21 may 2007 and 10 june 2010,
> >> but unfortunately neither seemed to include information about how to
> >> understand the --raw output from sg_ses.
> > 
> > It's a hex dump of the diagnostic mode page.
> 
> I know that. What I meant was which segments in the hex dump correlate
> to which segments in the text version of the dianostic mode page?

It's what the man page says:  the byte for byte output of the diagnostic
mode page minus the first four bytes.

> How long are the segments? 8 bytes? The way it is formatted something
> could hint that? Or is it just 4 bytes which another formatting suggests?

Well the descriptor format is variable, it's documented in the SES
standard.

[...]
> > I'd firstly validate that your lights can be flashed with the ses
> > driver ... if they can, then look for a mistake in the hex dump.
> 
> How can I validate that my lights can be flashed with the SES driver?

well, it depends what the enclosure calls it's slots, but it would be
something like

echo 1 > /sys/class/enclosure/<dev>/<slot>/fault

After making sure the ses driver is loaded and bound, of course.  Quite
a few fault lights are hard wired, and not amenable to software
interference (others aren't hard wired at all and only work with
software).

James


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