Principal Engineer Interview Questions

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You are given read-only access to all the modifying I/Os that target a block device, as they happen. Use this to implement point-in-time snapshots for the block device. The snapshots do not live on the block device. You are not allowed to modify the contents of the block device. Assume you are in user space. Feel free to assume access to anything else that you might need for your implementation; please do call your assumptions explicitly.
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Principal Engineer

Interviewed at WD

3.7
Mar 21, 2019

You are given read-only access to all the modifying I/Os that target a block device, as they happen. Use this to implement point-in-time snapshots for the block device. The snapshots do not live on the block device. You are not allowed to modify the contents of the block device. Assume you are in user space. Feel free to assume access to anything else that you might need for your implementation; please do call your assumptions explicitly.

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