Messages in this thread | | | Date | Wed, 06 Oct 2004 18:33:26 -0700 | From | Emiliano Garcia <> | Subject | RE: [BUG: multiple kernels] data corruption while reading from an USB2 connected HD |
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Hello Everyone,
I can confirm I am also experiencing problems with usb-storage on usb 2.0 devices. I have two separate usb 2.0 drives, one with the oxford 911 usb/firewire chipset and another with a gensys chip. Anyhow, I tar up my servers once a week and copy the bzipped tar to my usb hard drive. I have found now that I cannot extract the tar.bz2 files due to crc errors. When I run bzip2 -tvv on the original archive on the server, it passes without failure. When I run the test (bzip2 -tvv) on the copy of the archive on the usb 2.0 disks, it says they have crc errors. dmesg does not show anything exciting besides the mounting/detection of the drives. Please help!
Thanks to all of you for you hard work.
Emiliano Garcia
* /To/: linux-kernel@vger.kernel.org <mailto:linux-kernel%40vger.kernel.org> * /Subject/: [BUG: multiple kernels] data corruption while reading from an USB2 connected HD * /From/: Hajo Simons <simons@dc-systeme.de <mailto:simons%40dc-systeme.de>> * /Date/: Mon, 27 Sep 2004 11:06:06 +0200 * /Cc/: hsimons@gmx.de <mailto:hsimons%40gmx.de> * /Organization/: dc-Systeme * /Sender/: linux-kernel-owner@vger.kernel.org <mailto:linux-kernel-owner%40vger.kernel.org> * /User-agent/: KMail/1.7
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usb-storage sporadically loses data while reading
In a data stream of 20M about 10 bytes get lost averagely while reading from a HD connected via USB 2.0 which practically means that most files stored on that HD show different md5 fingerprints if the IO read buffer was flushed meanwhile.
keywords: usb-storage, external Disk, USB 2.0, data corruption while reading
data get lost while reading on: 2.4.27 2.6.8.1 2.6.8-gentoo-r3 2.6.8-gentoo-r4 preemptive/non-preemptive 2.6.9-rc1
whereas no faults are seen on: Windows XP SP1 (without specific drivers for that USB2 disk device)
system: Barton 3.2 200 Asus A7N8XX (nforce2) FSB at 192MHz, CPU at FSB*11.5 (A7N8* or CPU (don't know) cannot run stable for over a week at 200MHz FSB) 1G 400MHz DDR RAM (tested) runnung at FSB Speed 2 IDE disks connected to the onboard nforce2 IDE controller 1 IDE disk USB2ish connected to ALi (ID 0402:5621 ALi Corp.) via onboard nforce2 USB controller
test: (UAHD: usb attached HD) create a big file on a UAHD, say 20M md5sum it umount UAHD remount it md5sum that file again chances are 50/50, that you get a different number if md5sums are equal, repeat the procedure
( did the same test on that mentioned WinXP: everything ok; and yes, I did unplug the device between the reads )
note: system behaves rock-solid besides that issue tried blk_queue_max_sectors(sdev->request_queue, 1) in scsiglue.c:slave_configure() to no avail tried PREEMPTIVE on/off, same
details:
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