Menu
▾
▴
Re: [Moosefs-users] Lost all metadata on master w/ full disk
|
From: Davies L. <dav...@gm...> - 2011-11-09 05:32:06
|
new patch, with bug fixed On Tue, Nov 8, 2011 at 6:14 PM, Davies Liu <dav...@gm...> wrote: > I have made a patch to solve this, at attached. > > On Tue, Nov 8, 2011 at 5:42 PM, Davies Liu <dav...@gm...> wrote: >> In the mfsmaster, when dumping data to disk, it rename metadata.mfs.back >> to metadata.mfs.back.tmp first, then write to metadata.mfs.back, finally, it >> unlink metadata.mfs.back.tmp and metadata.mfs. >> >> If writing to metadata.mfs.back failed, we will get part of metadata, or damaged >> one, and previous metadata will be lost together. >> >> Why not writing to metadata.mfs.back.tmp first, if successfully, then rename it >> to metadata.mfs.back, and delete metadata.mfs ? I think this way is much safer. >> >> In the metalogger, it does not check the downloaded metadata, if it download a >> damaged one, then all the metadata will be lost. let metalogger keep sereral >> recently metadata may be safer. >> >> I will try to fix the above in my deployments, losing metadata is >> TOO UNACCEPTABLE. >> >> On Tue, Nov 8, 2011 at 7:24 AM, Nolan Eakins <no...@ea...> wrote: >>> I have a little server setup to give MooseFS a try. This server ran >>> out of disk space on its root partition a day or two ago. This >>> partition is where mfsmaster stored all of its data. Needless to say, >>> mfsmaster did something dumb and zeroed out all the metadata files >>> under /var/lib/mfs. It even looks like the metadata logger on another >>> machine was affected since it didn't store anything recoverable. >>> >>> So my entire moosefs file tree is completely hosed now, all because >>> mfsmaster can't handle a full disk. >>> >>> Other than this, I've been happy with MooseFS. >>> >>> Regards, >>> Nolan >>> >>> ------------------------------------------------------------------------------ >>> RSA(R) Conference 2012 >>> Save $700 by Nov 18 >>> Register now >>> http://p.sf.net/sfu/rsa-sfdev2dev1 >>> _______________________________________________ >>> moosefs-users mailing list >>> moo...@li... >>> https://lists.sourceforge.net/lists/listinfo/moosefs-users >>> >> >> >> >> -- >> - Davies >> > > > > -- > - Davies > -- - Davies |
