Re: File corruption pattern

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On Wed, May 18, 2005 at 10:14:07PM +1000, Michael D. Setzer II wrote:
> File corruption - Fedora Core 3
> shutdown -r -F now gives no errors.
> 
> Image file created on a P4 system with no problem after
> earlier corruption on AMD 64 machine that was working before.
> 
> 13,585,246,488 fc3ll.lzo
> 
> File copied to AMD 64 machine using ncftp no error in copy,
> but then fails lzop -t <fc3ll.lzo test with checksum error.
> 
> Then copied file to another system to compare original file to
> file from amd 64.
> 
> System was working fine with 4 images, but now fails, on image 
> creation,
> images that worked before, and even trying to blank drive with
> dd if=/dev/zero of=/0bits (Machine froze after about 8.3GB)
> 
> Here is the comparision of the bad file versus good file.
> Note: all addresses end with 3 and all differences are either
> 08 hex or 80 hex?
> 
> The system is less than 1 month old, and is an MSI 6741 
> motherboard with a 250GB Maxtor Diamond Max 10 6B250R0 drive.
> 
> Other than this error, which was working earlier with 4 pervious
> images, but now even those fail the lzop test.
> 
> Ran the Gyum, and it went thru the install of the new updates with 
> no problem.
> 
> Any suggestions on what tests might help to find what is causing the
> problem. Does it look like motherboard, harddisk, hdparm, etc.

mmmmmmmmmmmmm, no, sorry.  

We did chase problems with random file corruption on Redhat AS 3 using a
major brand name server with > 6GB of RAM a while back.  Never resolved, 
ended up sending back server and suing vendor.  

WHAT WE LEARNED was that iozone was an excellent test.  It has a -d
diagnostic option, which will compare what was written to what was read. 
I'd suggest you run that with a test file of at least 3X your RAM or 
16GB, whatever comes first.   That's now a part of our standard server
test before putting anything on the box. 

> Comparing files fc3ll.lzo and \FC3LL.LZO
> Address   64File P4   Diff
> 27B5C8B3:   62   E2    80
> 4BE758B3:   2C   AC    80
> 4BE761A3:   64   6C     8
> 4BE768D3:   0E   8E    80
> 785F13C3:   05   0D     8
> 785F1943:   E5   ED     8
> A1A788B3:   44   C4    80
> F3543943:   F3   FB     8
> F35448D3:   6B   EB    80
> FE52A1A3:   B3   BB     8
> 171BB943:   F6   FE     8
> 2ECBA8B3:   6D   ED    80
> 4009F8B3:   4C   CC    80
> 400A08D3:   17   97    80
> 8E3A71D3:   79   F9    80
> 8E3A73C3:   E0   E8     8
> 8E3A78B3:   67   E7    80
> 92123823:   67   6F     8
> 921238B3:   6C   EC    80
> BB3923C3:   23   2B     8
> BB392943:   11   19     8
> BCEA48D3:   3E   BE    80
> BE538943:   27   2F     8
> BE5398D3:   6F   EF    80
> E3BC71D3:   1A   9A    80
> E3BC73C3:   07   0F     8
> ECB0E1A3:   60   68     8
> 0CD6A8B3:   34   B4    80
> 0CD6A943:   F7   FF     8
> 0E8898D3:   0B   8B    80
> 1C65F3C3:   B0   B8     8
> 1C65F8B3:   71   F1    80
> 1C6C81A3:   13   1B     8
> 357BD8B3:   11   91    80
> 371BE1A3:   63   6B     8
> 4AB5E8B3:   50   D0    80
> 4AB5E943:   F7   FF     8
> 78AB41A3:   01   09     8
> 78AB48D3:   45   C5    80
> 87EB63C3:   21   29     8
> 88B971A3:   E2   EA     8
> 88B978D3:   4A   CA    80
> A74861A3:   C5   CD     8
> B11443C3:   70   78     8
> B1C9F1A3:   33   3B     8
> B1C9F8D3:   6F   EF    80
> D5CC9943:   01   09     8
> DA7ED1A3:   21   29     8
> 03A658B3:   0A   8A    80
> 03A668D3:   61   E1    80
> 03AEF873:   6C   EC    80
> 1A7B0143:   2E   AE    80
> 1A7B03C3:   37   3F     8
> 1A7B0943:   24   2C     8
> 
> Thanks.
> 
> +----------------------------------------------------------+
>   Michael D. Setzer II -  Computer Science Instructor      
>   Guam Community College  Computer Center                  
>   mailto:mikes@xxxxxxxxxxxxxxxx                            
>   mailto:msetzerii@xxxxxxxxx
>   http://www.guam.net/home/mikes
>   Guam - Where America's Day Begins                        
> +----------------------------------------------------------+
> 
> http://setiathome.berkeley.edu
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> (Total Hours: 270,550)
> 
> 
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