[Question] RBD Striping

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Hi, i found that RBD Striping documentation are not enough detail.
Can some one explain how RBD stripe own object over more objects and
why it's better use striping instead of small rbd object size?

Also if RBD use object size = 4MB by default does it's mean that every
time object has modified OSD read 4MB of data and replicate it,
instead of only changes?
If yes, can striping help with that?

Thanks for any answer

-- 
Have a nice day,
Timofey.
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