Re: [Moosefs-users] Lost all metadata on master w/ full disk

[Allen L. <lan...@gm...>]

What makes you think it can't?  I don't think there's any reason you 
can't run mfsmetalogger on a chunk server, though I haven't tried.

On 11/9/2011 4:28 PM, Steve wrote:
> and why cant each chunkserver be a logger also by default
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> -------Original Message-------
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> From: Davies Liu
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> Date: 09/11/2011 19:53:33
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> To: Nolan Eakins
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> Cc: moo...@li...
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> Subject: Re: [Moosefs-users] Lost all metadata on master w/ full disk
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> In the mfsmaster, when dumping data to disk, it rename metadata.mfs.back
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> to metadata.mfs.back.tmp first, then write to metadata.mfs.back, finally, it
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> unlink metadata.mfs.back.tmp and metadata.mfs.
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> If writing to metadata.mfs.back failed, we will get part of metadata, or
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> one, and previous metadata will be lost together.
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> Why not writing to metadata.mfs.back.tmp first, if successfully, then rename
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> to metadata.mfs.back, and delete metadata.mfs ? I think this way is much
> safer.
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> In the metalogger, it does not check the downloaded metadata, if it download
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> damaged one, then all the metadata will be lost. let metalogger keep sereral
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> recently metadata may be safer.
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> I will try to fix the above in my deployments, losing metadata is
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> TOO UNACCEPTABLE.
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> On Tue, Nov 8, 2011 at 7:24 AM, Nolan Eakins<no...@ea...>  wrote:
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>> 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
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