Re: [Moosefs-users] Out of disk space on master / recovery failed

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

My chunk servers are on different machines, I actually have a setup 
that's supposed to be pretty resilient.  4 Chunkservers, 1 master, 1 
metalogger, and 1 app server running mfsmount -- all separate machines 
(VMs).

I too lost all the data.  The chunks survived, but since the metadata 
was corrupt, all the files were lost and the chunks marked for recycling 
(goal 0).

I should have paid more attention to the default drive the master was 
using for metadata, but a full-on crash just due to disk space 
exhaustion on the master seems excessive.

On 11/4/2011 10:52 AM, Steve wrote:
> This happened to me too, on a mfsmaster running on a small silicon drive.
> Lost the lot. A powercut causing a mfschunkserver failure creating extra
> logging.
>
> Looks like a repeatable problem that needs addressing.
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> -------Original Message-------
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> From: Allen Landsidel
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> Date: 04/11/2011 14:37:09
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> To: moo...@li...
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> Subject: [Moosefs-users] Out of disk space on master / recovery failed
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>
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> So I didn't plan ahead well and ended up with /var filling up on my
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> master over night, causing the master to crash.
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> mfsmetarestore refused to recover the system, I think because it didn't
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> get a chance to write out the metadata file. It seems there's something
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> wrong with the way it's doing writes. After the crash both the
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> metadata.mfs and metadata.mfs.back were 0 bytes, and mfsmetarestore
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> (obviously) refused to read from them.
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> Some but not all of the changelog files were 0 bytes as well. Same
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> story on the backup (metalogger) server.
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> Just a heads up, I think a little more checking would be in order here
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> to make sure there is space available for the metadata, and at least to
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> prevent the master from crashing when/if it can't write the metadata.
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> If it had stayed up with all the metadata in memory I could've seen the
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> disk issue and brought up another metalogger with more disk space to
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> catch up and take over.
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