요약·해설과 원문, 전문 번역을 서로 분리했습니다. API 이름, symbol, source path는 원문 표기를 사용합니다.
1. 요약·해설
원문의 핵심 논리와 kernel programming 관점의 보충 설명입니다. 아래의 전문 번역과는 별도로 작성했습니다.
2. 영어 원문 전체
번역 기준이 된 Linux v6.18.37 원문입니다. 줄 번호는 이 버전의 파일 좌표입니다.
원문 전체 펼치기
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id="desc176">Master slide</desc>
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id="tspan245">RSDataReply</tspan>
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id="tspan295">w_make_resync_request()</tspan>
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id="tspan311">receive_DataRequest()</tspan>
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y="19606"
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id="tspan327">drbd_endio_read_sec()</tspan>
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id="tspan343">w_e_end_rsdata_req()</tspan>
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id="text357"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
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id="tspan359">receive_RSDataReply()</tspan>
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id="tspan375">drbd_endio_write_sec()</tspan>
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id="text389"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
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id="tspan391">e_end_resync_block()</tspan>
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<tspan
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x="13610.301 13911.301 14016.301 14088.301 14177.301 14355.301 14567.301 14728.301"
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id="tspan425">WriteAck</tspan>
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id="text439"
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<tspan
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id="tspan441">got_BlockAck()</tspan>
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id="tspan457">Resync blocks, 4-32K</tspan>
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id="tspan507">WriteAck</tspan>
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<tspan
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id="tspan541">Data</tspan>
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<tspan
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id="tspan557">drbd_make_request()</tspan>
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id="text571"
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id="tspan573">receive_Data()</tspan>
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y="7606"
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id="tspan589">drbd_endio_write_sec()</tspan>
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<text
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id="text603"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="12192 12370 12548 12725 12903 13081 13259 13437 13509 13686 13847 14008 14114"
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y="8007"
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id="tspan605">e_end_block()</tspan>
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id="text619"
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style="font-size:318px;font-weight:400;fill:#000080;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="5647 5825 6003 6092 6269 6481 6553 6731 6892 7052 7264 7425 7586 7692"
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y="8606"
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id="tspan621">got_BlockAck()</tspan>
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<text
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id="text635"
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style="font-size:423px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="8000 8305 8542 8779 9016 9109 9346 9486 9604 9956 10049 10189 10328 10565 10705 10942 11179 11298 11603 11742 11835 11954 12191 12310 12428 12665 12902 13139 13279 13516 13753"
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y="4877"
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id="tspan637">Regular mirrored write, 512-32K</tspan>
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<text
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id="text651"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="5381 5610 5787 5948 6126 6304 6482 6659 6837 7015 7087 7265 7426 7587 7692"
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y="6003"
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id="tspan653">w_send_dblock()</tspan>
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</text>
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id="path663"
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style="fill:#008000;visibility:visible" />
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<tspan
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y="6905"
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id="tspan685">drbd_endio_write_pri()</tspan>
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</text>
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id="path695"
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style="fill:#008000;visibility:visible" />
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<path
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<path
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<text
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y="15454.597"
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id="tspan735">DataReply</tspan>
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</text>
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<path
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id="path745"
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style="fill:#008000;visibility:visible" />
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<path
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d="M 12000,14002 L 8237,14566"
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id="path749"
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style="fill:none;stroke:#008000;visibility:visible" />
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<text
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x="2280.3804"
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y="-2103.2141"
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transform="matrix(0.9788674,0.2044961,-0.2044961,0.9788674,0,0)"
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id="text767"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="11316.381 11545.381 11722.381 11811.381 11989.381 12218.381 12396.381 12573.381 12751.381 12929.381 13090.381"
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y="9981.7861"
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id="tspan769">DataRequest</tspan>
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</text>
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<text
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id="text783"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="4746 4924 5030 5207 5385 5563 5826 6003 6164 6342 6520 6626 6803 6981 7159 7337 7498 7587 7692"
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y="11506"
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id="tspan785">drbd_make_request()</tspan>
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</text>
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<text
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id="text799"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="12200 12306 12484 12645 12822 12894 13055 13233 13411 13639 13817 13906 14084 14312 14490 14668 14846 15024 15185 15273 15379"
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y="12807"
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id="tspan801">receive_DataRequest()</tspan>
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<text
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id="text815"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="12200 12378 12484 12661 12839 13017 13195 13373 13550 13622 13800 13978 14084 14262 14439 14617 14795 14956 15134 15295 15400"
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y="13607"
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id="tspan817">drbd_endio_read_sec()</tspan>
352
</text>
353
<text
354
id="text831"
355
style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
356
<tspan
357
x="12192 12421 12598 12776 12954 13132 13310 13487 13665 13843 14021 14110 14288 14465 14571 14749 14927 15033"
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y="14008"
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id="tspan833">w_e_end_data_req()</tspan>
360
</text>
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id="g835"
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style="visibility:visible">
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<desc
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id="desc837">Drawing</desc>
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<text
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id="text847"
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style="font-size:318px;font-weight:400;fill:#008000;font-family:Helvetica embedded">
369
<tspan
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x="4885 4991 5169 5330 5507 5579 5740 5918 6096 6324 6502 6591 6769 6997 7175 7353 7425 7586 7692"
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y="14607"
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id="tspan849">receive_DataReply()</tspan>
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</g>
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<text
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id="text863"
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style="font-size:423px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="8000 8305 8398 8610 8821 8914 9151 9363 9575 9693 9833 10070 10307 10544 10663 10781 11018 11255 11493 11632 11869 12106"
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y="10878"
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id="tspan865">Diskless read, 512-32K</tspan>
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</text>
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<text
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id="text879"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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x="5029 5258 5435 5596 5774 5952 6130 6307 6413 6591 6769 6947 7125 7230 7408 7586 7692"
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y="12004"
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id="tspan881">w_send_read_req()</tspan>
390
</text>
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<text
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id="text895"
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style="font-size:423px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
394
<tspan
395
x="6961 7266 7571 7854 8159 8278 8515 8633 8870 9107 9226 9463 9581 9700 9793 10030"
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y="2806"
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id="tspan897">DRBD 8 data flow</tspan>
398
</text>
399
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id="path907"
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<path
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id="path919"
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style="fill:none;stroke:#000000;visibility:visible" />
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<path
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id="path931"
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<text
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<tspan
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y="5202"
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id="tspan949">al_begin_io()</tspan>
418
</text>
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<tspan
423
x="1632 1810 1882 2060 2220 2398 2661 2839 2910 3088 3177 3355 3533 3605 3783 3888"
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y="7331"
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id="tspan965">al_complete_io()</tspan>
426
</text>
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<text
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id="text979"
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style="font-size:318px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
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<tspan
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y="17431"
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id="tspan981">rs_begin_io()</tspan>
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</text>
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<tspan
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y="22331"
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id="tspan997">rs_complete_io()</tspan>
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id="text1011"
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<tspan
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y="18402"
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id="tspan1013">rs_begin_io()</tspan>
450
</text>
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458
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459
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3. 한국어 전문 번역
영어 원문의 문단 순서와 의미를 유지한 전체 번역입니다. 코드, 함수명, symbol과 URL은 원문 표기를 유지합니다.
미러 쓰기, 디스크리스 읽기 및 재동기화 데이터 경로
1-459이 SVG는 `DRBD 8 data flow`를 세 가지 대표 작업으로 나누어 보여 줍니다. 왼쪽 열과 오른쪽 열은 서로 연결된 두 DRBD 노드를 뜻하고, 기울어진 화살표는 노드 사이를 오가는 프로토콜 패킷을 나타냅니다. 녹색은 데이터·요청·응답의 주 경로이고 짙은 파란색은 원격 쓰기 완료를 알리는 `WriteAck` 경로입니다. 검은 괄호와 함수명은 로컬 활동 로그 또는 재동기화 I/O 보호 구간의 시작과 끝을 표시합니다.
`Regular mirrored write, 512-32K`에서는 주 노드의 `drbd_make_request()`가 로컬 요청을 만들고 `al_begin_io()`로 활동 로그 보호 구간을 시작합니다. `w_send_dblock()`이 `Data` 패킷을 피어로 보내는 동안 로컬 쓰기는 `drbd_endio_write_pri()`에서 완료됩니다. 보조 노드는 `receive_Data()`로 데이터를 받아 디스크에 기록하고, `drbd_endio_write_sec()`와 `e_end_block()`을 거쳐 `WriteAck`를 돌려보냅니다. 주 노드가 `got_BlockAck()`를 처리한 뒤 `al_complete_io()`로 활동 로그 구간을 마칩니다.
`Diskless read, 512-32K`는 로컬 디스크가 없는 노드가 피어의 디스크에서 데이터를 읽는 경로입니다. `drbd_make_request()`와 `w_send_read_req()`가 `DataRequest`를 보내면 피어의 `receive_DataRequest()`가 이를 받고 `drbd_endio_read_sec()`에서 보조 디스크 읽기를 완료합니다. `w_e_end_data_req()`가 `DataReply`를 보내며 요청 노드의 `receive_DataReply()`가 최종 데이터를 받습니다. 이 경로에는 로컬 데이터 디스크 쓰기나 별도 `WriteAck`가 없습니다.
`Resync blocks, 4-32K`에서는 재동기화 대상이 `rs_begin_io()`로 I/O 구간을 열고 `w_make_resync_request()`가 `RSDataRequest`를 소스에 보냅니다. 소스는 `receive_DataRequest()`로 요청을 받아 `drbd_endio_read_sec()`에서 블록을 읽고 `w_e_end_rsdata_req()`가 `RSDataReply`를 반환합니다. 대상의 `receive_RSDataReply()`가 데이터를 받은 뒤 `drbd_endio_write_sec()`와 `e_end_resync_block()`으로 기록을 끝내고 `WriteAck`를 보냅니다. 소스가 `got_BlockAck()`를 처리하며, 양쪽의 `rs_complete_io()`가 각각의 재동기화 I/O 보호 구간을 닫습니다.
그림의 패킷 크기는 일반 미러 쓰기와 디스크리스 읽기가 512바이트부터 32KiB까지이고, 재동기화 블록은 4KiB부터 32KiB까지입니다. 함수명·패킷명·크기 표기는 커널 소스와 프로토콜을 추적할 수 있도록 원문 표기를 그대로 유지하고, 한국어 설명에서 역할과 실행 위치를 보충합니다.
요소원문 표기한국어 해설
제목DRBD 8 data flowDRBD 8의 두 노드 사이 데이터 및 확인 패킷 흐름
녹색 화살표Data / DataRequest / DataReply / RSDataRequest / RSDataReply데이터와 읽기·재동기화 요청 및 응답
짙은 파란색 화살표WriteAck피어 디스크 쓰기 완료 확인
왼쪽 함수 열drbd_make_request(), w_send_dblock(), w_send_read_req()요청을 시작하는 노드의 처리 경로
오른쪽 함수 열receive_Data(), receive_DataRequest()요청 또는 데이터를 받는 피어의 처리 경로
활동 로그 괄호al_begin_io() / al_complete_io()일반 미러 쓰기가 활동 로그에서 보호되는 구간
재동기화 괄호rs_begin_io() / rs_complete_io()각 노드가 재동기화 I/O를 예약하고 해제하는 구간
일반 쓰기 크기Regular mirrored write, 512-32K512바이트부터 32KiB까지의 미러 쓰기
디스크리스 읽기 크기Diskless read, 512-32K512바이트부터 32KiB까지의 원격 읽기
재동기화 크기Resync blocks, 4-32K4KiB부터 32KiB까지의 재동기화 블록
SVG의 색상, 열, 괄호와 크기 표기가 무엇을 뜻하는지 정리합니다.
주 노드→drbd_make_request()→al_begin_io()→w_send_dblock()→Data→피어 receive_Data()
주 노드→drbd_endio_write_pri()→로컬 디스크 쓰기 완료
피어→drbd_endio_write_sec()→e_end_block()→WriteAck→주 노드 got_BlockAck()→al_complete_io()
주 노드가 데이터를 로컬과 피어에 기록하고 원격 확인을 받은 뒤 활동 로그 구간을 닫는 순서입니다.
요청 노드→drbd_make_request()→w_send_read_req()→DataRequest→피어 receive_DataRequest()
피어→drbd_endio_read_sec()→w_e_end_data_req()→DataReply→요청 노드 receive_DataReply()
디스크가 없는 요청 노드가 피어 디스크에서 블록을 읽어 오는 요청·응답 순서입니다.
재동기화 대상→rs_begin_io()→w_make_resync_request()→RSDataRequest→소스 receive_DataRequest()
재동기화 소스→drbd_endio_read_sec()→w_e_end_rsdata_req()→RSDataReply→대상 receive_RSDataReply()
재동기화 대상→drbd_endio_write_sec()→e_end_resync_block()→WriteAck→소스 got_BlockAck()
양쪽 노드→rs_complete_io()→재동기화 I/O 구간 종료
대상이 소스에 블록을 요청하고 기록 완료 확인을 소스에 돌려주는 전체 순서입니다.
원문 라벨경로역할
drbd_make_request()일반 쓰기·디스크리스 읽기상위 블록 요청을 DRBD 요청으로 만듦
al_begin_io()일반 쓰기활동 로그 I/O 보호 구간 시작
w_send_dblock()일반 쓰기미러링할 데이터 블록 전송
Data일반 쓰기피어에 기록할 실제 데이터 패킷
drbd_endio_write_pri()일반 쓰기주 노드 로컬 쓰기 완료 처리
receive_Data()일반 쓰기피어가 미러 쓰기 데이터를 수신
drbd_endio_write_sec()일반 쓰기·재동기화보조 또는 대상 디스크 쓰기 완료 처리
e_end_block()일반 쓰기피어의 일반 블록 처리 완료
WriteAck일반 쓰기·재동기화원격 디스크 기록 완료 확인 패킷
got_BlockAck()일반 쓰기·재동기화상대 노드의 블록 확인 응답 처리
al_complete_io()일반 쓰기활동 로그 I/O 보호 구간 종료
w_send_read_req()디스크리스 읽기피어에 원격 읽기 요청 전송
DataRequest디스크리스 읽기일반 데이터 읽기 요청 패킷
receive_DataRequest()디스크리스 읽기·재동기화피어가 데이터 또는 재동기화 읽기 요청 수신
drbd_endio_read_sec()디스크리스 읽기·재동기화피어의 보조 디스크 읽기 완료 처리
w_e_end_data_req()디스크리스 읽기일반 읽기 응답 전송 작업 완료
DataReply디스크리스 읽기요청한 블록 데이터를 담은 응답 패킷
receive_DataReply()디스크리스 읽기요청 노드가 원격 읽기 데이터를 수신
rs_begin_io()재동기화재동기화 I/O 보호 구간 시작
w_make_resync_request()재동기화재동기화할 블록 요청 생성
RSDataRequest재동기화재동기화 데이터 읽기 요청 패킷
w_e_end_rsdata_req()재동기화재동기화 데이터 응답 전송 작업 완료
RSDataReply재동기화재동기화할 블록 데이터를 담은 응답 패킷
receive_RSDataReply()재동기화대상이 재동기화 블록 데이터 수신
e_end_resync_block()재동기화대상 디스크의 재동기화 블록 처리 완료
rs_complete_io()재동기화재동기화 I/O 보호 구간 종료
Regular mirrored write, 512-32K일반 쓰기일반 미러 쓰기 경로와 전송 크기
Diskless read, 512-32K디스크리스 읽기원격 읽기 경로와 전송 크기
Resync blocks, 4-32K재동기화재동기화 경로와 블록 크기
DRBD 8 data flow전체SVG 전체 도식의 제목
그림에 표시된 고유 함수 및 패킷 라벨 30개의 역할을 흐름별로 대응시킵니다.
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id="tspan605">e_end_block()</tspan>
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<text
id="text619"
style="font-size:318px;font-weight:400;fill:#000080;visibility:visible;font-family:Helvetica embedded">
<tspan
x="5647 5825 6003 6092 6269 6481 6553 6731 6892 7052 7264 7425 7586 7692"
y="8606"
id="tspan621">got_BlockAck()</tspan>
</text>
<text
id="text635"
style="font-size:423px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="8000 8305 8542 8779 9016 9109 9346 9486 9604 9956 10049 10189 10328 10565 10705 10942 11179 11298 11603 11742 11835 11954 12191 12310 12428 12665 12902 13139 13279 13516 13753"
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id="tspan637">Regular mirrored write, 512-32K</tspan>
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<text
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="5381 5610 5787 5948 6126 6304 6482 6659 6837 7015 7087 7265 7426 7587 7692"
y="6003"
id="tspan653">w_send_dblock()</tspan>
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<path
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<text
id="text683"
style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="4602 4780 4886 5063 5241 5419 5597 5775 5952 6024 6202 6380 6609 6714 6786 6875 7053 7231 7409 7515 7587 7692"
y="6905"
id="tspan685">drbd_endio_write_pri()</tspan>
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style="fill:#008000;visibility:visible" />
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style="fill:none;stroke:#008000;visibility:visible" />
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y="-2103.2141"
transform="matrix(0.9788674,0.2044961,-0.2044961,0.9788674,0,0)"
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="11316.381 11545.381 11722.381 11811.381 11989.381 12218.381 12396.381 12573.381 12751.381 12929.381 13090.381"
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<text
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<tspan
x="4746 4924 5030 5207 5385 5563 5826 6003 6164 6342 6520 6626 6803 6981 7159 7337 7498 7587 7692"
y="11506"
id="tspan785">drbd_make_request()</tspan>
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<text
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style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
<tspan
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y="12807"
id="tspan801">receive_DataRequest()</tspan>
</text>
<text
id="text815"
style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="12200 12378 12484 12661 12839 13017 13195 13373 13550 13622 13800 13978 14084 14262 14439 14617 14795 14956 15134 15295 15400"
y="13607"
id="tspan817">drbd_endio_read_sec()</tspan>
</text>
<text
id="text831"
style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="12192 12421 12598 12776 12954 13132 13310 13487 13665 13843 14021 14110 14288 14465 14571 14749 14927 15033"
y="14008"
id="tspan833">w_e_end_data_req()</tspan>
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<g
id="g835"
style="visibility:visible">
<desc
id="desc837">Drawing</desc>
<text
id="text847"
style="font-size:318px;font-weight:400;fill:#008000;font-family:Helvetica embedded">
<tspan
x="4885 4991 5169 5330 5507 5579 5740 5918 6096 6324 6502 6591 6769 6997 7175 7353 7425 7586 7692"
y="14607"
id="tspan849">receive_DataReply()</tspan>
</text>
</g>
<text
id="text863"
style="font-size:423px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="8000 8305 8398 8610 8821 8914 9151 9363 9575 9693 9833 10070 10307 10544 10663 10781 11018 11255 11493 11632 11869 12106"
y="10878"
id="tspan865">Diskless read, 512-32K</tspan>
</text>
<text
id="text879"
style="font-size:318px;font-weight:400;fill:#008000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="5029 5258 5435 5596 5774 5952 6130 6307 6413 6591 6769 6947 7125 7230 7408 7586 7692"
y="12004"
id="tspan881">w_send_read_req()</tspan>
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<text
id="text895"
style="font-size:423px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="6961 7266 7571 7854 8159 8278 8515 8633 8870 9107 9226 9463 9581 9700 9793 10030"
y="2806"
id="tspan897">DRBD 8 data flow</tspan>
</text>
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d="M 3900,5300 L 3700,5300 L 3700,7000 L 3900,7000"
id="path907"
style="fill:none;stroke:#000000;visibility:visible" />
<path
d="M 3900,17600 L 3700,17600 L 3700,22000 L 3900,22000"
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style="fill:none;stroke:#000000;visibility:visible" />
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style="fill:none;stroke:#000000;visibility:visible" />
<text
id="text947"
style="font-size:318px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="2126 2304 2376 2554 2731 2909 3087 3159 3337 3515 3587 3764 3870"
y="5202"
id="tspan949">al_begin_io()</tspan>
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<text
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<tspan
x="1632 1810 1882 2060 2220 2398 2661 2839 2910 3088 3177 3355 3533 3605 3783 3888"
y="7331"
id="tspan965">al_complete_io()</tspan>
</text>
<text
id="text979"
style="font-size:318px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="2126 2232 2393 2571 2748 2926 3104 3176 3354 3531 3603 3781 3887"
y="17431"
id="tspan981">rs_begin_io()</tspan>
</text>
<text
id="text995"
style="font-size:318px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="1626 1732 1893 2071 2231 2409 2672 2849 2921 3099 3188 3366 3544 3616 3793 3899"
y="22331"
id="tspan997">rs_complete_io()</tspan>
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<text
id="text1011"
style="font-size:318px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="16027 16133 16294 16472 16649 16827 17005 17077 17255 17432 17504 17682 17788"
y="18402"
id="tspan1013">rs_begin_io()</tspan>
</text>
<text
id="text1027"
style="font-size:318px;font-weight:400;fill:#000000;visibility:visible;font-family:Helvetica embedded">
<tspan
x="16115 16221 16382 16560 16720 16898 17161 17338 17410 17588 17677 17855 18033 18105 18282 18388"
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</svg>
요약·해설
DRBD-data-packets.svg:1-459DRBD 8의 일반 미러 쓰기, 디스크리스 읽기, 블록 재동기화에서 두 노드 사이를 이동하는 데이터·요청·응답·쓰기 확인 패킷과 관련 완료 함수를 설명하는 SVG 흐름도입니다.
세 경로는 패킷 왕복 방향과 완료 조건이 다릅니다. 일반 미러 쓰기는 `WriteAck`와 활동 로그 완료를 기다리고, 디스크리스 읽기는 `DataRequest`·`DataReply`만 왕복하며, 재동기화는 `RSDataRequest`·`RSDataReply` 뒤 대상 기록과 `WriteAck`까지 확인합니다.