[Lustre-devel] storing SOM epoch in EA

Yuriy Umanets Yury.Umanets at Sun.COM
Tue Feb 19 03:11:30 PST 2008

Vitaly Fertman wrote:
>> hi!
>> Can we use IAM for storing epoch? It is fast and does not have such 
>> strong size limitations. 
> there are no size limitations, EA can be stored in a separate
> block, we just want to minimize IO.
EA is separate block is evil. It makes things slow.
>> We could make "epoch" index in mkfs time (like  
>> it is done for existing indexes now) and use object's fid as a key and 
>> epoch as value.
> this looks like it will double IO/seeks for each inode.
Well, it did not in cmd3 :)


More information about the lustre-devel mailing list