Re: File System Corruption teste

Richard B. Johnson (root@analogic.com)
Tue, 11 Mar 1997 19:49:31 -0500 (EST)

On Tue, 11 Mar 1997, Richard B. Johnson wrote:
> File system corruption tests continued with new operating system:
> This is an ext2 file system on Linux version 2.1.29.
> Spare disk, 98% full of a file called ZERO, from `cp /dev/zero /mnt/ZERO`
[SNIPPED]
> # cmp -l /mnt/ZERO /dev/zero &> xxx &
> # head xxx
> 94295041 17 0
> 94295042 17 0
> 94295043 17 0
> 94295044 17 0
> 94295045 17 0
> 94295046 17 0
> 94295047 17 0
> 94295048 17 0
> 94295049 17 0
> 94295050 17 0
> # tail xxx
> 94384120 17 0
> 94384121 17 0
> 94384122 17 0
> 94384123 17 0
> 94384124 17 0
> 94384125 17 0
> 94384126 17 0
> 94384127 17 0
> 94384128 17 0
> cmp: /mnt/ZERO: I/O error # Normal (EOF)
>
> This shows file system corruption starting at byte offset 94295041.
> This means that the last good byte was at 94295040. 94295041 / 1024 = 92085.
> I don't know what this means. Bet it isn't good, though.
[SNIPPED]

Okay! I found the problem! Although the file-system had been built many
times on this device, tha partition table had been built with another
SCSI Controller! When I executed fdisk, it warned that the extended
translation was not correct.

I made new partitions on this drive, made new file-systems, then repeated
the tests. There was NO file-system corruption.

Therefore, for the guy that started this thread originally, Ingo Molnar, I
suggest that he look at the partition table with fdisk. He might see the same
warning. New paritions fix the problem.

Cheers,
Dick Johnson
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Richard B. Johnson
Project Engineer
Analogic Corporation
Voice : (508) 977-3000 ext. 3754
Fax : (508) 532-6097
Modem : (508) 977-6870
Ftp : ftp@boneserver.analogic.com
Email : rjohnson@analogic.com, johnson@analogic.com
Penguin : Linux version 2.1.29 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.
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