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Re: Purpose of stacking block devices

From: Raphael Pour
Subject: Re: Purpose of stacking block devices
Date: Wed, 21 Oct 2020 10:57:04 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1

I messed up the order of the block devices. However this is the original
statement I meant:

"Driver-specific options for raw

    This is the image format block driver for raw images. It is usually
stacked on top of a protocol level block driver such as file."

On 10/21/20 8:23 AM, Raphael Pour wrote:
> Hello,
> 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].
> The related sentence came with [2] within the batch [3]. I couldn't
> figure out why this 'stacking' might be useful.
> Thanks and kind regards,
> Raphael
> [1]  Driver-specific options for raw:
> https://qemu.weilnetz.de/doc/latest/system/invocation.html#hxtool-1
> [2] doc: Document driver-specific -blockdev option:
> https://lists.nongnu.org/archive/html/qemu-devel/2017-06/msg05325.html
> [3] [Qemu-devel] [PULL 00/61] Block layer patches:
> https://lists.nongnu.org/archive/html/qemu-devel/2017-06/msg05319.html

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