[CentOS] filesystem corruption?

[Nataraj]

On 04/06/2015 02:37 PM, m.roth at 5-cent.us wrote:
>
> I then loaded the drive in another server, and examined it. fsck reported
> both / and /boot were clean, but when I redid this with fask -c, to check
> for bad blocks, it found many multiply-claimed blocks.

Just running fsck with no arguments will not do anything unless the
filesystem is unclean or the time interval between checks has expired. 
I suspect that fsck -f would have found problems as well.

Time will tell if there is a hardware problem with the system, but I
would probably run some hardware diagnostics on the server including
memory and IO tests if you wanted to be on the safe side.  You could
also reformat the disk and run some write/readback diagnostics if you
wanted to find out if the disk is bad.

Nataraj
>
> First question: anyone have an idea why it showed as clean, until I
> checked for bad blocks? Would that just be because I'd gracefully shut
> down the original server, and it mounted ok on the other server?
>
> Mounting it on /mnt, I found no driver errors being reported in the logs,
> nor anything happening, including logons, before an automated contact from
> another server, which failed. AND I checked our loghost, and nothing odd
> shows there, neither in message nor in secure.
>
> At this point, I *think* it's filesystem corruption, rather than a
> compromised system, but I'd really like to hear anyone's thoughts on this.
>
>       mark
>
>
>
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