Issuing SCSI command 'MODE SENSE'

Issuing SCSI command 'MODE SENSE'

[Nirmala S]

Hi,

While using the MODE SENSE command how does one calculate the "Allocation Length" MSB, LSB, the LUN no. and the length of the data returned by the command.

Kindly let me know.

Thanks and Regards,
Mala
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RE: Issuing SCSI command 'MODE SENSE'

[Cress, Andrew R]

Mala,

The LUN should be passed in as part of the host:chan:targ:lun addressing.
Use SCSI_IOCTL_GET_IDLUN to return it.  

If you are building a utility, I have some code that shows this and the
length stuff for mode sense, see http://scsirastools.sourceforge.net
(sgmode.c & sgsub.c).

scsiinfo is another open-source tool that shows mode sense usage.

Andy

-----Original Message-----
From: Nirmala S [mailto:nmala@mail.com] 
Sent: Tuesday, November 12, 2002 8:38 AM
To: linux-scsi@vger.kernel.org
Subject: Issuing SCSI command 'MODE SENSE'


Hi,

While using the MODE SENSE command how does one calculate the "Allocation
Length" MSB, LSB, the LUN no. and the length of the data returned by the
command.

Kindly let me know.

Thanks and Regards,
Mala
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RE: Issuing SCSI command 'MODE SENSE'

[Nirmala S]

Hi,

Thanks for the reply.

I have found some code :

LEN = 480
cdb[1] = (((dev_id & 0xF00) >> 8) << 5)
cdb[7] = ((480 >> 8) & 0xff)
cdb[8] = (480 & 0xff)

Any idea why it is 'anded' with 255. Can't seem to understand how the lun value is calculated.

Any idea ??

Thanks and Regards,
Mala

----- Original Message -----
From: "Cress, Andrew R" <andrew.r.cress@intel.com>
Date: Tue, 12 Nov 2002 06:01:10 -0800
To: "''Nirmala S''" <nmala@mail.com>, linux-scsi@vger.kernel.org
Subject: RE: Issuing SCSI command 'MODE SENSE'


> Mala,
> 
> The LUN should be passed in as part of the host:chan:targ:lun addressing.
> Use SCSI_IOCTL_GET_IDLUN to return it.  
> 
> If you are building a utility, I have some code that shows this and the
> length stuff for mode sense, see http://scsirastools.sourceforge.net
> (sgmode.c & sgsub.c).
> 
> scsiinfo is another open-source tool that shows mode sense usage.
> 
> Andy
> 
> -----Original Message-----
> From: Nirmala S [mailto:nmala@mail.com] 
> Sent: Tuesday, November 12, 2002 8:38 AM
> To: linux-scsi@vger.kernel.org
> Subject: Issuing SCSI command 'MODE SENSE'
> 
> 
> Hi,
> 
> While using the MODE SENSE command how does one calculate the "Allocation
> Length" MSB, LSB, the LUN no. and the length of the data returned by the
> command.
> 
> Kindly let me know.
> 
> Thanks and Regards,
> Mala
> -- 
> __________________________________________________________
> Sign-up for your own FREE Personalized E-mail at Mail.com
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> 
> Single & ready to mingle? lavalife.com:  Where singles click. Free to
> Search!
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> 
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> the body of a message to majordomo@vger.kernel.org
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> 
> 

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