[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 :)
--
umka
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