rbd mirror : space and io requirements ?

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Hi,

I'm begin to look at rbd mirror features.

How much space does it take ? Is it only a journal with some kind of list of block changes ?

and how much io/s does it take ?
worst case, 4k block write , how much write in journal ?


My osd are ssd, 1journal + data for each osd/ssd, but I don't overloaded them with write currently.

Regards,

Alexandre

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