Let's google it.
Is this the article you are looking for?
On 3/14/14 5:44 PM, Nicolas Michel wrote:
> Hello Guys,
> It's a general question about how dm and particularly multipathd handle IO? I mean, is it a transaction? Is each IO initiated from the OS get back an acknowledgement? If it is, is there a retry mechanism?
> Or are the IO sent blindingly to the block device?
> If someone have some good article on it, I would be very interested in understanding more deeply how IO are handled.
> Thanks a lot,
> Nicolas MICHEL
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