olio + mogileFS

[Harold Lim <ro...@yahoo.com>]

Hi All,

In the doc, it said "Our initial testing with MogileFS found some severe performance issues, so for now we advice using a normal filesystem (LocalFS)."

I was wondering what kind of performance issues these are?
I would think mogileFS would definitely have better performance than localFS.



-Harold


      

Re: olio + mogileFS

[Shanti Subramanyam <Sh...@Sun.COM>]

Harold Lim wrote:
> Hi All,
>
> In the doc, it said "Our initial testing with MogileFS found some severe performance issues, so for now we advice using a normal filesystem (LocalFS)."
>
> I was wondering what kind of performance issues these are?
> I would think mogileFS would definitely have better performance than localFS.
>
>   
Really ? How can that ever be ? MogileFS adds an additional layer on top 
of the local filesystem to achieve the distributed nature - the metadata 
for this is stored in a regular MySQL database. So for every file 
access, it has to first access the database to find out the actual 
location, then retrieve the actual contents. How can this ever be faster 
than a regular local FS ?

We need to go back and re-test MogileFS - haven't had a chance to do 
this yet. It is possible that we had made some configuration error or 
tuned something inappropriately for the poor performance we saw - it was 
awhile back.
>
> -Harold
Shanti
>   
>