refactor: 문서 개선 중
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donghyeon-ka
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<svg xmlns="http://www.w3.org/2000/svg" width="1253" height="564" viewBox="0 0 1253 564" role="img" aria-labelledby="diagram-title diagram-description">
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<title id="diagram-title">virtqueue 뒤 QEMU block backend의 세 형태</title>
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<desc id="diagram-description">왼쪽에서 Guest /dev/vda 요청이 virtio-blk와 virtqueue를 지나 VM boundary를 넘는다. QEMU block backend에서 qcow2 file, RAW file, Host block device 세 갈래로 나뉜다. qcow2와 RAW 노드에는 Host filesystem을 경유한다는 차이를, Host block device에는 파일 backend가 아니라는 차이를 적었다. 세 경로 아래의 Host block stack은 별도 Concept이 맡으므로 이 그림에서는 다시 합치지 않는다.</desc>
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.node-shape.kind-database, .node-shape.kind-datastore, .node-shape.kind-storage { fill: #f8fafc; }
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.node-shape.kind-queue, .node-shape.kind-event, .node-shape.kind-topic { fill: #fafafa; }
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<text class="edge-label" x="992.0" y="193.0">block-device backend</text>
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<text class="edge-label" x="968.0" y="262.5">qcow2 backend</text>
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<text class="edge-label" x="993.8" y="388.0">RAW backend</text>
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<text class="edge-label" x="300.0" y="262.5">block I/O</text>
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<text class="edge-label" x="648.0" y="262.5">VM boundary</text>
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<g id="node-vda">
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<text class="node-label" x="145.0" y="287.5">/dev/vda</text>
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</g>
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<g id="node-virtio-queue">
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<rect class="node-shape kind-component emphasis-normal role-service" data-evidence="6355-6364" x="380.0" y="245.5" width="188.0" height="88.0" rx="7" />
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<text class="node-label" x="474.0" y="272.5">virtio-blk · virtqueue</text>
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<text class="node-detail" x="396.0" y="310.5">Guest</text>
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<text class="node-detail" x="396.0" y="326.5">VM boundary 직전</text>
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</g>
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<g id="node-backend">
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<text class="node-label" x="808.0" y="287.5">QEMU block backend</text>
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</g>
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<g id="node-block-device">
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<text class="node-label" x="1128.0" y="87.0">Host block device</text>
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<text class="node-detail" x="1064.0" y="125.0">/dev/...</text>
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<text class="node-detail" x="1064.0" y="141.0">file 없음</text>
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<text class="node-detail" x="1064.0" y="157.0">→ Host block stack</text>
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</g>
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<g id="node-qcow2">
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<text class="node-label" x="1128.0" y="264.0">qcow2 file</text>
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<text class="node-detail" x="1064.0" y="302.0">file backend</text>
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<text class="node-detail" x="1064.0" y="318.0">mapping · metadata</text>
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<text class="node-detail" x="1064.0" y="334.0">→ Host filesystem</text>
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</g>
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<g id="node-raw">
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<text class="node-label" x="1128.0" y="441.0">RAW file</text>
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<text class="node-detail" x="1067.5" y="479.0">file backend</text>
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<text class="node-detail" x="1067.5" y="495.0">offset 대응</text>
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<text class="node-detail" x="1067.5" y="511.0">→ Host filesystem</text>
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</g>
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</svg>
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