moosefs-users

[Moosefs-users] Power failure... unable to restore metadata.mfs

[Pedro N. <pe...@st...>]

Hi there,

We run another test today after losing about 3TB+ of data when we could 
not restore the metadata.mfs file. We were in the process of copying 
files over when we power was cut off. This lead to an error when running 
the mfsmetarestore -a command as follows...

3605: '|' expected

We really feel like MooseFS is the best solution that we could find but 
somehow after not being able to recover from something so real as a 
power failure, I really worry.

Please advice as to how to fix this problem.

Sincerely,



Pedro Naranjo / STL Technologies / Solutions Architech / 888.556.0774

Re: [Moosefs-users] Power failure... unable to restore metadata.mfs

[Boyko Y. <b.y...@ex...>]

Hi,

Not sure if it is related at all, but there is a known bug with mfsmetarestore, take a look here: http://sourceforge.net/mailarchive/forum.php?thread_name=045c01cbe3e6%249a511760%24cef34620%24%40borychowski%40gemius.pl&forum_name=moosefs-users

You may want to try the suggested workaround,

Regards,
Boyko

On Mar 22, 2011, at 12:19 AM, Pedro Naranjo wrote:

> Hi there,
> 
> We run another test today after losing about 3TB+ of data when we could 
> not restore the metadata.mfs file. We were in the process of copying 
> files over when we power was cut off. This lead to an error when running 
> the mfsmetarestore -a command as follows...
> 
> 3605: '|' expected
> 
> We really feel like MooseFS is the best solution that we could find but 
> somehow after not being able to recover from something so real as a 
> power failure, I really worry.
> 
> Please advice as to how to fix this problem.
> 
> Sincerely,
> 
> 
> 
> Pedro Naranjo / STL Technologies / Solutions Architech / 888.556.0774
> 
> 
> ------------------------------------------------------------------------------
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Re: [Moosefs-users] Power failure... unable to restore metadata.mfs

[Michal B. <mic...@ge...>]

Hi Pedro!

It may happen that after power failure last changelog may be broken. You
need to find the last line of the changelog (usually changelog.0.mfs) and
delete the last line.

Generally speaking, after power failure it is better to use metadata files
from metalogger, not running mfsmetarestore on the master server.

We made some improvements to the metarestore in the next development
version. Now it is more failproof for these kind of errors. We added a '-b'
option which forces to write the resulting metadata file at the first
encountered error (as "better such than none"). If you would like to test
it, we may send you metarestore sources before we officialy publish 1.6.21.


Kind regards
Michał Borychowski 
MooseFS Support Manager
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Gemius S.A.
ul. Wołoska 7, 02-672 Warszawa
Budynek MARS, klatka D
Tel.: +4822 874-41-00
Fax : +4822 874-41-01



-----Original Message-----
From: Pedro Naranjo [mailto:pe...@st...] 
Sent: Monday, March 21, 2011 11:20 PM
To: moo...@li...
Subject: [Moosefs-users] Power failure... unable to restore metadata.mfs

Hi there,

We run another test today after losing about 3TB+ of data when we could 
not restore the metadata.mfs file. We were in the process of copying 
files over when we power was cut off. This lead to an error when running 
the mfsmetarestore -a command as follows...

3605: '|' expected

We really feel like MooseFS is the best solution that we could find but 
somehow after not being able to recover from something so real as a 
power failure, I really worry.

Please advice as to how to fix this problem.

Sincerely,



Pedro Naranjo / STL Technologies / Solutions Architech / 888.556.0774


----------------------------------------------------------------------------
--
Enable your software for Intel(R) Active Management Technology to meet the
growing manageability and security demands of your customers. Businesses
are taking advantage of Intel(R) vPro (TM) technology - will your software 
be a part of the solution? Download the Intel(R) Manageability Checker 
today! http://p.sf.net/sfu/intel-dev2devmar
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