[7585] in linux-scsi channel archive
Question about sg_utils
daemon@ATHENA.MIT.EDU (Tassa Sandro)
Thu Nov 25 09:58:15 1999
Date: Thu, 25 Nov 1999 15:53:43 +0100 (MET)
From: Tassa Sandro <tassa@apemaia.roma1.infn.it>
Reply-To: Tassa Sandro <tassa@apemaia.roma1.infn.it>
To: Mailing List Linux Kernel <linux-kernel@vger.rutgers.edu>
Cc: linux-scsi@vger.rutgers.edu
Message-ID: <Pine.LNX.3.96.991125154844.26805A-100000@apemaia.roma1.infn.it>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Hi all,
I'm studing how and 'trying to write' a scsi driver.
To test driver's performance now
I'm working with sg_utils < of Gilbert >.
When I use sg_dd512 all work fine!
But (there's always a but)
when I use sg_dd2048 (on the same device with the same driver)
I see that it writes and correctly reads only the first 2048 byte
after that, it doesn't behave as I think:
it writes and reads rubbish!
Questions:
Is it correct using sg_dd2048 on devices with sector size = 512?
I have seen that the difference between sg_dd512 and sg_dd2048 is
in the scsi cmnd (in the 'transfert lenght' field),
where sg_ddXXXX writes the number of blocks.
Who have to handle this value?
Thanks,
Sandro
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