Re: Best approach for using sg_ses to control locate/fault leds?

[Benjamin ESTRABAUD <be@mpstor.com>]

Hi,

As far as I know, you unfortunately have to send back the entire page 
when it comes to SES.

Ben.

Jeff Johnson wrote:
> Greetings,
>
>     I am using sg_ses to poll a SAS JBOD for locate and fault led 
> status and light leds if needed. So far the only method I can figure 
> out how to accomplish this is by reading page 2 of the SES management 
> device in the jbod chassis, dumping the raw hex output to a file, 
> setting the select and RQST IDENT or RQST FAULT bits and sending back 
> the entire 480 bytes with modified bits.
>
> Turn locate led on:
> sg_ses --page=0x2 /dev/sg18 -f --raw > /tmp/out
> ...twittle bits in /tmp/out with editor of choice...
> sg_ses --control --page=2 -d - /dev/sg18 < /tmp/out
>
>     Is there a utility, a '--element=' arg or another method by which 
> only the four bytes of the element control diag page can be sent 
> instead of all 480 bytes?
>
> --Jeff
>