scsi Target card and scsi Initiator card

scsi Target card and scsi Initiator card

[Nikhil Dharashivkar]

hi all,
    I want to know how target card is exposed to the intiator.
How connectivity is done between both cards. How luns are exposed from
target mode card to initiator card.
 How communication is done when there is one target mode card and multiple
initiator cards.


Thanks,
 Nikhil.     

Re: scsi Target card and scsi Initiator card

[Nikhil Dharashivkar]

Hi,
     Actually our setup of hardware is : There is one board . On that we
have one target mode card (LSI) and more than one initiator cards.
       First thing I have to do is I should able to export all LUNS or
target devices connected to initiator card through this target mode card.
      For that how should i think to develop software layer . Is there
already implemeted code ?


 ---- Original Message -----
From: "Vladislav Bolkhovitin" <vst@vlnb.net>
To: "Nikhil Dharashivkar" <dharashivkar.nikhil@spsoftindia.com>
Sent: Wednesday, October 06, 2004 5:27 PM
Subject: Re: scsi Target card and scsi Initiator card


> Nikhil,
>
> Everything is done according to appropriate SCSI standards, like Fibre
> Channel or iSCSI. Try to find their description, for example, on
> http://www.t10.org.
>
> Best regards,
> Vlad
>
> Nikhil Dharashivkar wrote:
> > hi all,
> >     I want to know how target card is exposed to the intiator.
> > How connectivity is done between both cards. How luns are exposed from
> > target mode card to initiator card.
> >  How communication is done when there is one target mode card and
multiple
> > initiator cards.
> >
> >
> > Thanks,
> >  Nikhil.
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
> >

Re: scsi Target card and scsi Initiator card

[NucleoDyne Systems, Inc.]

Hi,
   Is your configuration as described below?

server-----scsi cable ---- target port ---initiator(s)----devices


   There is an easy solution. You may develop a kernel module
that will accept the packets from the target card and forward them
to the initiator. There are a few calls in linux to submit a request 
to an initiator. You may look at scsi_do_request() call.

I guess I can not disclose more in details as I have signed a NDA.

A single LSI card (at least a fusion MPT) can be programmed so that it
responds in the SELECTION phase for multiple target devices. That is 
the same card can raise the BUSY signal for different target ids
and responds to a selection. This way you can present multiple targets
behind your initiator through your target mode port on the board.

Please feel free to contact me if you need additional help.

Kallol
-- 
--
NucleoDyne Corporation
nucleon@nucleodyne.com
www.nucleodyne.com
408-718-8164

On Wed, 2004-10-06 at 22:44, Nikhil Dharashivkar wrote:
> Hi,
>      Actually our setup of hardware is : There is one board . On that we
> have one target mode card (LSI) and more than one initiator cards.
>        First thing I have to do is I should able to export all LUNS or
> target devices connected to initiator card through this target mode card.
>       For that how should i think to develop software layer . Is there
> already implemeted code ?
> 
> 
>  ---- Original Message -----
> From: "Vladislav Bolkhovitin" <vst@vlnb.net>
> To: "Nikhil Dharashivkar" <dharashivkar.nikhil@spsoftindia.com>
> Sent: Wednesday, October 06, 2004 5:27 PM
> Subject: Re: scsi Target card and scsi Initiator card
> 
> 
> > Nikhil,
> >
> > Everything is done according to appropriate SCSI standards, like Fibre
> > Channel or iSCSI. Try to find their description, for example, on
> > http://www.t10.org.
> >
> > Best regards,
> > Vlad
> >
> > Nikhil Dharashivkar wrote:
> > > hi all,
> > >     I want to know how target card is exposed to the intiator.
> > > How connectivity is done between both cards. How luns are exposed from
> > > target mode card to initiator card.
> > >  How communication is done when there is one target mode card and
> multiple
> > > initiator cards.
> > >
> > >
> > > Thanks,
> > >  Nikhil.
> > >
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > >
> > >
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: scsi Target card and scsi Initiator card

[Vladislav Bolkhovitin]

Nikhil Dharashivkar wrote:
> Hi,
>      Actually our setup of hardware is : There is one board . On that we
> have one target mode card (LSI) and more than one initiator cards.
>        First thing I have to do is I should able to export all LUNS or
> target devices connected to initiator card through this target mode card.
>       For that how should i think to develop software layer . Is there
> already implemeted code ?

Take a look on SCSI target mid-level (SCST) on 
http://scst.sourceforge.net. You just need to develop small target 
add-on to the LSI's initiator driver as it was done for Qlogic cards.

Vlad

Re: scsi Target card and scsi Initiator card

[Nikhil Dharashivkar]

Hi ....
     I have gone thr' documents that discribe Target Emulator or that type
of software layer.
     I have LSI22320-R with LSI1030 and LSI1030T (Two Cards). I also have
driver Tekram (Initiator Card).
   Now I joind Tekram and LSI card with external scsi cable. Connection was
done and disk also exposed from LSI Card to Tekram.
Basically LSI card that i have contains Inititator/Target mode firmware.
    So What i want to do , to make LSI card to run in only Target Mode. For
that , Can i write a kernel module that can read incomming scsi
commands from any initiator card (here Tekram) to the LSI card. and that
module will invoke the firware on the LSI card intead directly by commnads ?
What i think here that i have to do low level i..e card level programming to
get these scsi commands , is it possible / feasible ?


Regrads,
Nikhil.

----- Original Message -----
From: "Vladislav Bolkhovitin" <vst@vlnb.net>
To: "Nikhil Dharashivkar" <dharashivkar.nikhil@spsoftindia.com>
Cc: <linux-scsi@vger.kernel.org>
Sent: Thursday, October 07, 2004 1:08 PM
Subject: Re: scsi Target card and scsi Initiator card


> Nikhil Dharashivkar wrote:
> > Hi,
> >      Actually our setup of hardware is : There is one board . On that we
> > have one target mode card (LSI) and more than one initiator cards.
> >        First thing I have to do is I should able to export all LUNS or
> > target devices connected to initiator card through this target mode
card.
> >       For that how should i think to develop software layer . Is there
> > already implemeted code ?
>
> Take a look on SCSI target mid-level (SCST) on
> http://scst.sourceforge.net. You just need to develop small target
> add-on to the LSI's initiator driver as it was done for Qlogic cards.
>
> Vlad
> -
> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html