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List:       linux-usb-devel
Subject:    Re: [linux-usb-devel] USB 2 External HD - Random Disconnects [Repost}
From:       Alan Stern <stern () rowland ! harvard ! edu>
Date:       2004-04-19 18:35:38
Message-ID: Pine.LNX.4.44L0.0404191434080.967-100000 () ida ! rowland ! org
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On Mon, 19 Apr 2004, Oliver Strutynski wrote:

> I have a Hama external USB2 HD. I had it running for quite some time with the
> SuSE 2.4.x kernels for SuSE 9.0. After upgrading first to 2.6.4 and now to
> 2.6.5 (2.6.5-8 SuSE Mantel Kernel) however I see frequent problems when
> transferring large amounts of data to or from the HD. The HD works fine for a
> while and then seemingly disconnects. To remount the drive I have to unplug
> it, unmount the fs, plug in again and re-mount it. Extracts
> from /var/log/messages and /proc/usb follow below.
> 
> I have seen some similar reports on this list and the newsgroups and tried to
> apply the patch previously posted to usb-devel (change size of transfers to
> 64K, .maxsectors=128 in scsiglue.c), with no effect (it seems, as if the
> device even disconnects faster).
> 
> Any help would be appreciated.
> 
> Thanks, Oliver Strutynski

To get some more useful information, turn on the usb-storage debugging 
option in your kernel's configuration.  That will generate loads of extra
debugging messages in the system log.

Alan Stern



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