[Pvfs2-users] metadata

[Sam Lang]

On Feb 2, 2007, at 3:28 PM, Steve wrote:

> Hi,
>
> Is there any rough rule of thumb guide for the size of the metadata  
> for the
> size of the store ?

Hi Steve,

The size of the metadata as a percent of the size of the storage  
space depends on the sizes of the files.  I'm doing a back of the  
envelope calculation, but I think that in general, each file takes up  
somewhere around 650 bytes to store its metadata, while directories  
are a little less (maybe 500 bytes).  Remember though that the  
metadata size changes for different configurations (more servers,  
etc.).  There's also overhead related to the storage space itself,  
which is about (100K * numservers).  If you know how many files/ 
directories you have in your volume, you should be able to get a  
rough estimate of your metadata size using those numbers above.

-sam


>
> Steve
>
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