Re: [Moosefs-users] Problems after power failure

[Tuukka L. <tlu...@gm...>]

OK I put in place the file the dev sent me and can not see any data loss...

I found the file in question the one I got in the error and it seems fine.

The whole system is up and functioning.

I run the system on a old desktop computer and a another PC I bought
for $25 so the dev recommends making sure you have good memory, but I
guess I am using whatever I got =) Aside from this error everything
has been fine. Didn't run the memtest they recommended, but I would
not count out memory errors.

However I would like to understand the situation better mainly for
what are my recourses. As WK articulated already had my metadata been
completely corrupt would I have lost all my data? Would I lose just
one file the one with the error? And can I fix this error myself?

Thanks,

Tuukka

On Wed, Jun 1, 2011 at 3:39 PM, WK <wk...@bn...> wrote:
> On 6/1/2011 2:30 AM, Michal Borychowski wrote:
>>
>> We think that this problem could be caused by your RAM in the master. We
>> recommend using RAM with parity control. You can also run a test from
>> http://www.memtest.org/ on your server and check your existing RAM. Of
>> course, the bit could have been changed also on the motherboard level or CPU
>> - which is much less probable.
>>
>>
>> Also you can see in the log that file 7538 is located between 7553 and 7555:
>
>
> So in a situation like this where the metadata is now corrupt.
>
> Is the problem fixable with only the loss of the one file? (and how does
> one fix it).
>
> or is his entire MFS setup completely corrupt and he would need to have
> had a backup?
>
> Can I assume that older archived versions of the metadata.mfs could be
> used to recover most of the files.
>
> -bill
>
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