Re: [PATCH] SCSI: Add the SGPIO support for sata_nv.c

[Yan Seiner <yan@seiner.com>]

Yinghai Lu wrote:
> On Tue, Nov 6, 2007 at 8:09 PM, Yinghai Lu <yhlu.kernel@gmail.com> wrote:
>   
>> On Nov 7, 2006 1:55 AM, Peer Chen <pchen@nvidia.com> wrote:
>>     
>>> Modified and resent out the patch as attachment.
>>> Description about the patch:
>>> Add SGPIO support in sata_nv.c.
>>> SGPIO (Serial General Purpose Input Output) is a sideband serial 4-wire
>>> interface that a storage controller uses to communicate with a storage
>>> enclosure management controller, primarily to control activity and
>>> status LEDs that are located within drive bays or on a storage
>>> backplane. SGPIO is defined by [SFF8485].
>>> In this patch,we drive the LEDs to blink when read/write operation
>>> happen on SATA drives connect the corresponding ports on MCP55 board.
>>>       
I missed the start of  this thread....  Is it possible to blink the 
lights from user space?  This is very useful when trying to locate a 
dead or dying drive.   for example, /dev/sdc dies, but I have no way of 
knowing which one it is without unplugging all the cables one at a 
time.  A userspace utility that would allow me to blink a drive activity 
light would be very useful.

--Yan