[Lustre-discuss] Mounting Lustre as an ext3 partition

[Nick Jennings]

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Ah yes, of course. Thanks for the reply, I guess I wasn't thinking that
one through completely.

So if, for example, the MDS drive dies, my entire Lustre filesystem is
unrecoverable?

Brian J. Murrell wrote:
> On Wed, 2009-05-13 at 11:13 +0200, Nick Jennings wrote:
>>  I just wanted to check if there would be problems with mounting a
>> Lustre filesystem as ext3 and reading/writing to it.
> 
> It probably won't mount as ext3 as it's likely not compatible enough
> with ext3 any more.  ext4 if you have that perhaps, but better to just
> use ldiskfs which is it's native format.
> 
>> Would there be any
>> corruption or other unwanted effects to the data integrity?
> 
> Not just by mounting it.  Of course, if you start fiddling with it's
> contents, you could cause damage to the coherency of the overall Lustre
> filesystem.
> 
>>  If we encounter any issues with Lustre, a backup plan would be to mount
>> the volume as ext3 and serve the files (for example via NFS) as a
>> temporary solution in an emergency.
> 
> No, that won't work.  You have to remember that a Lustre filesystem
> separates the metadata (filenames, attributes, etc.) from the file data
> and puts the former on the MDT and the latter on OSTs.  Only Lustre can
> bring these back together to form a cohesive filesystem again.
> 
> b.
> 
> 
> 
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- --
Nick Jennings
Technical Director
Creative Motion Design
www.creativemotiondesign.com
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