Re: [Moosefs-users] How to speedup replication from disk marked for removal

[Atom P. <ap...@di...>]

On 05/18/2012 10:03 AM, Allen, Benjamin S wrote:
> I have no idea what MFS will do if it tries to write to a non-writtable
> chunk file.

This story might be related.

Last week we lost cooling in our server room. Among the other effects 
one of our chunk servers entered a weird state where it was still 
running but wasn't operating correctly. The MFS master didn't recognize 
that the server was down so it wasn't taken out of the pool. Most of the 
MFS client mounts became read-only, presumably when they were trying to 
write chunks to that server.

So it appears that if the MFS client can't write a chunk then the entire 
mfsmount becomes read-only. However, this wasn't the focus of our 
troubleshooting so I can't be confident in that conclusion.

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