Regarding rbd --image-shared and --shared <tag>

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Hi,
My assumption was I can't map the same image from two clients (and run IO concurrently)  as this can corrupt the image. But, in the latest rbd cli I saw --image-shared and --shared<tag>, wondering what is the use case of this ?
This means that I can now map same image from two different clients and run IO in active-active mode ?
What is the difference between --image-shared and --shared<tag> ?
Is there any restriction on the operation allowed in this mode ?
Appreciate any information on this.

Thanks & Regards
Somnath

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