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Re: Purpose of stacking block devices

From: Alberto Garcia
Subject: Re: Purpose of stacking block devices
Date: Wed, 21 Oct 2020 13:44:29 +0200
User-agent: Mutt/1.5.23 (2014-03-12)

On Wed, Oct 21, 2020 at 08:23:17AM +0200, Raphael Pour wrote:

> could someone explain me the purpose of stacking block devices on
> top of each other?
> A block device with driver file or qcow2 "is usually" stacked on top of
> a block device with driver raw as stated in the docs[1].

One of them specifies the format, i.e. how the data is structured
internally (qcow2, qed, raw, vmdk, ...) and the other one specifies
the protocol used to access that data (file, http, nbd, ...).


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