Re: [Moosefs-users] master shutdown unexpected

[欧阳晓华 <toa...@gm...>]

Hi
Files can not be restored, no matter it is from master server or from
metalogger server, only the metadata.mfs.back.tmp can be restored
It sounds unbelievable,  but it really is. I don't what happened will cause
this error. And fortunately, this file server is only for backup files,
there seems no file lost.
Than you for your suggest.

2010/9/13 Michał Borychowski <mic...@ge...>

>  Hi!
>
>
>
> The situtation you describe should not have taken place as overwriting
> metadata.mfs.back with metadata.mfs.back.tmp should be an atomic operation
> in the file system. So theoretically the file metadata.mfs.back should be a
> proper metada file and metadata.mfs.back.tmp can contain partial data.
> First, you should take metadata.mfs.back and later metadata.mfs.back.tmp. If
> for some reason metadata.mfs.back is not accessible you should use
> metadata.mfs.back from a backup or metalogger machine and lastly you use
> metadata.mfs.back.tmp
>
>
>
>
>
> 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
>
>
>
>
>
> *From:* 欧阳晓华 [mailto:toa...@gm...]
> *Sent:* Sunday, September 12, 2010 7:01 AM
> *To:* moo...@li...
> *Subject:* [Moosefs-users] master shutdown unexpected
>
>
>
> hello：
>
>       my master server shutdown for lost power, when I start server again,
> I use mfsmetarestore -a to restore mfsdata,
>
> it report that metadata.mfs.back can't be read, and I find
> var/mfs/metadata.mfs.back exist, but small than metadata.mfs.back.tmp
>
> I copy metadata.mfs.back.tmp to metadata.mfs.back, mfsmetarestore runs OK.
>
> I want to know if this action correct, is there any data lost? Or what can
> I do when master shutdown unexpected?
>
> Thanks!
>