lkml.org 
[lkml]   [2009]   [Nov]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Weird I/O errors with USB hard drive not remounting filesystem readonly
On Mon, 23 Nov 2009 tmhikaru@gmail.com wrote:

> Thank you. I've gotten output of it screwing up, but it's a 62MB file. I
> don't think I'm allowed to send attachments here, nor do I know what I'm
> supposed to be looking for in this output. So, instead I'm putting the
> (compressed) file up on my home computer. If you've got suggestions for what
> I should use instead, let me know.
>
> http://hikaru.no-ip.info:3000/1.mon.out.xz
>
> Although I don't think you'll need it, I've included the dmesg output of
> what happened when I ran my backup script, just in case it helps at all.

Here's an annotated example of one of those hiccups:

f1aa1f00 2416018820 S Bo:1:003:1 -115 31 = 55534243 07050100 00100000 80000a28 000000ae ef000008 00000000 000000
f1aa1f00 2416018929 C Bo:1:003:1 0 31 >

The computer issued a READ command for 8 blocks (4096 bytes) starting
at block number 0x0000aeef = 44783.

d2588b00 2416019342 S Bi:1:003:2 -115 4096 <
d2588b00 2416019428 C Bi:1:003:2 -32 0
f1aa1f00 2416019435 S Co:1:003:0 s 02 01 0000 0082 0000 0
f1aa1f00 2416019554 C Co:1:003:0 0 0

The drive returned 0 bytes of data.

f1aa1f00 2416019560 S Bi:1:003:2 -115 13 <
f1aa1f00 2416019678 C Bi:1:003:2 0 13 = 55534253 07050100 00100000 00

And then it returned a status indicating no error but 4096 bytes
residue (i.e., incorrect or undelivered data). This caused the
usb-storage driver to send the SCSI layer a result code of DID_ERROR
with no sense data.

> sd 0:0:0:0: [sda] Unhandled error code
> sd 0:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
> end_request: I/O error, dev sda, sector 44783

The DID_ERROR code caused the SCSI layer to display this error message.

> sd 0:0:0:0: [sda] Unhandled error code
> sd 0:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
> end_request: I/O error, dev sda, sector 51823

I would have expected the READ to be retried, but in these two cases
it wasn't. The usbmon log contained five instances of this error
sequence; the other three were retried successfully. I don't know what
the difference was.

Alan Stern



\
 
 \ /
  Last update: 2009-11-24 18:19    [W:0.099 / U:0.608 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site