From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12207] block reads/writes > 122880 bytes to USB tape drive gives EBUSY
Date: Tue, 23 Dec 2008 04:32:22 -0800 (PST)
Message-ID: <20081223123222.69AFC108042@picon.linux-foundation.org>
References: <bug-12207-11613@http.bugzilla.kernel.org/>
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http://bugzilla.kernel.org/show_bug.cgi?id=12207





------- Comment #4 from anonymous@kernel-bugs.osdl.org  2008-12-23 04:32 -------
Reply-To: oliver@neukum.org

Am Dienstag, 23. Dezember 2008 08:30:49 schrieb
bugme-daemon@bugzilla.kernel.org:
> http://bugzilla.kernel.org/show_bug.cgi?id=12207
> 
> 
> kai.makisara@kolumbus.fi changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                  CC|                            |kai.makisara@kolumbus.fi
> 
> 
> 
> 
> ------- Comment #3 from kai.makisara@kolumbus.fi  2008-12-22 23:30 -------
> I have been testing large blocks with 2.6.27.7 and I was able to reach 6 MB
> without any tricks. The difference between your system and mine is that my tape
> is connected with SCSI and yours is with USB.
> 
> Looking at linux/drivers/usb/storage/scsiglue,c I find the following:
> 
>         /* limit the total size of a transfer to 120 KB */
>         .max_sectors =                  240,
> 
> Maybe the USB experts can tell what is the reason for this.

Many USB devices fail larger transfers.

        Regards
                Oliver


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