Re: [Moosefs-users] Chunks

[Ricardo J. B. <ric...@da...>]

El Jue 03 Marzo 2011, randall escribió:
> On 03/02/2011 11:40 AM, Michal Borychowski wrote:
> > The main purpose of MooseFS system is security not the space savings. And
> > solution with RAID6 is not that secure. We generally advise not to use
> > any RAIDs and using at least goal=2.
>
> Wondering about this.
>
> when no raid and goal=2, this would mean when using multiple disks per
> server that each disk would be a seperate chunk location.
>
> Can see the use of this when you use 1 single server as each copy would
> reside on 2 seperate disks so you are somewhat protected against disk
> failure.

I don't think so, goal=2 means one chunk in each chunkserver.

If you have only one chunckserver your files would be undergoal, though I'm 
not sure if one chunkserver alone is treated diferently.

> but when you have 2 servers with each 12 disks (24 chunk locations),
> does each chunk reside on 2 seperate servers giving protection against
> server failure?

Exactly.

You can see where each chunk is located with mfsfileinfo /path/to/file.

Regards,
-- 
Ricardo J. Barberis
Senior SysAdmin / ITI
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