Re: doubt in sg, in sending SCSI CDB

["shankar krishna" <kshan01@hotmail.com>]

>shankar krishna wrote:
>>Hi,
>>
>>I just run the program that was given in end of
>>SCSI-Programming-HOWTO, sending a Inquiry command.
>
>That HOWTO is pretty old and has been replaced by:
>http://tldp.org/HOWTO/SCSI-Generic-HOWTO
Yes. I looked into this. But even this does not allow me
to send CDBs in FC(FCP-2). When I see a in FC analyzer
between disk drive and HBA, it shows me
1. An Ex Write is done first.
2. Then a FCP DATA is done with my Inquiry CDB command
going as "data".(since I used a write on that fd)

I dont want this. What I want is...in the first instant
itself I want the INQUIRY cmd to be sent. Why I am
trying to do this is... to finally be able to send
a vendor specific CDBs through FC HBA where "our"
target can analyse those and take
specific action ...rather than standard ones.
>
>>I have IBM FC drive with Qlogic FC HBA. The
>>device /dev/sda1 is able to open.
>>
>>When I read the vendor information (at offset 8), the
>>file is spitting Junk. The only change I did to that
>>program is  change the device file from “/dev/sg”
>>to “/dev/sda1”.
>
>Ouch. That example program can only be used against sg
>devices (and it is a shortcoming of the old HOWTO's
>example program that it doesn't tell you at run time).
>For more recent example programs you may like to try
>sg3_utils found at
>http://www.torque.net/sg (or freshmeat.net).
This was very useful. Since I am dealing with
sda( FC disk drives), can I use these to send my
SCSI cmds? Is there any api's available where I
can just fill 10 Byte CDB(Any command) and send
to the target and try to interpret the reponse
myself?? (Like ASPI available for Windows??)
---very similar to sendASPI32Command in adaptec ASPI ----

>There are several examples of INQUIRY programs (e.g.
>sg_inq).
>
><snip/>
>
>Doug Gilbert

Thanks again.
Shankar.

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