Hi everyone, I have some questions regarding to the mechanism of device mapper: After the device mapper layer gets the mapping information, it will issue IO request to the real device. How does it perform IO operation at this stage? For example, if the device is a block device, will it go to the page cache and check whether the desired block is in cache? If the block is not in cache and it read from the physical device, will the block be cached in memory?
Thanks very much!
Zhiming
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