Re: [Moosefs-users] Problems after power failure

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

OK I ran the memtest on the master server, It got through without
finding any errors.

2011/6/2 Michal Borychowski <mic...@ge...>:
> Hi!
>
> In the meantime please run the memtest - we are curious if it really was
> hardware problem or maybe it could be a software problem
>
>
> Regards
> Michal
>
> -----Original Message-----
> From: Tuukka Luolamo [mailto:tlu...@gm...]
> Sent: Thursday, June 02, 2011 9:55 AM
> To: WK
> Cc: moo...@li...
> Subject: Re: [Moosefs-users] Problems after power failure
>
> 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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>
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