{"id":871,"date":"2026-10-14T04:00:00","date_gmt":"2026-10-13T19:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=871"},"modified":"2026-10-14T01:13:13","modified_gmt":"2026-10-13T16:13:13","slug":"qs-research-ceph-erasure-coding-20261012","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=871","title":{"rendered":"Ceph\u306e\u30a4\u30ec\u30a4\u30b8\u30e3\u30fc\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30014\uff0b2\u3067\u4fdd\u5b58\u5bb9\u91cf\u3092\u6e1b\u3089\u3059\u4ed5\u7d44\u307f\u3068\u5fa9\u65e7\u306e\u8ca0\u62c5"},"content":{"rendered":"<p>\u540c\u3058\u30c7\u30fc\u30bf\u3092\u4e09\u3064\u305a\u3064\u4fdd\u5b58\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001\u7d30\u304b\u304f\u5206\u3051\u3066\u5fa9\u5143\u7528\u306e\u60c5\u5831\u3092\u6dfb\u3048\u308c\u3070\u3001\u5fc5\u8981\u306a\u5bb9\u91cf\u3092\u6e1b\u3089\u305b\u307e\u3059\u3002\u305f\u3060\u3001\u7a7a\u304d\u5bb9\u91cf\u304c\u5897\u3048\u308b\u3053\u3068\u3068\u3001\u6545\u969c\u4e2d\u3082\u540c\u3058\u901f\u3055\u3067\u4f7f\u3044\u7d9a\u3051\u3089\u308c\u308b\u3053\u3068\u306f\u5225\u3067\u3059\u3002<\/p>\n<p>\u5206\u6563\u30b9\u30c8\u30ec\u30fc\u30b8\u306eCeph\u306b\u306f\u3001\u30a4\u30ec\u30a4\u30b8\u30e3\u30fc\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff08Erasure Coding\u3001EC\uff09\u3068\u3044\u3046\u4fdd\u5b58\u65b9\u5f0f\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u30c7\u30fc\u30bf4\u65ad\u7247\u3068\u5fa9\u5143\u75282\u65ad\u7247\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u300c4\uff0b2\u300d\u3092\u4f8b\u306b\u3001\u4e09\u91cd\u8907\u88fd\u3068\u306e\u5bb9\u91cf\u5dee\u3001\u65ad\u7247\u306e\u7f6e\u304d\u5834\u6240\u3001\u6545\u969c\u5f8c\u306b\u623b\u3059\u307e\u3067\u306e\u8ca0\u62c5\u3092\u3001\u516c\u5f0f\u306eTentacle\u7cfb\u5217\u306e\u6587\u66f8\u304b\u3089\u8aad\u307f\u89e3\u304d\u307e\u3059\u30024\uff0b2\u306f\u672c\u8a18\u4e8b\u306e\u6bd4\u8f03\u4f8b\u3067\u3042\u308a\u3001\u3059\u3079\u3066\u306eCeph\u74b0\u5883\u306e\u521d\u671f\u8a2d\u5b9a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<section class=\"influvetor-quick-summary\" aria-label=\"\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>4\uff0b2\u306eEC\u306f\u3001\u7b26\u53f7\u5316\u306b\u5fc5\u8981\u306a\u5bb9\u91cf\u304c\u7406\u8ad6\u4e0a\u5143\u30c7\u30fc\u30bf\u306e1.5\u500d\u306b\u306a\u308a\u3001\u4e09\u91cd\u8907\u88fd\u306e3\u500d\u3088\u308a\u5c0f\u3055\u304f\u306a\u308a\u307e\u3059\u304c\u3001\u5b9f\u969b\u306e\u5fc5\u8981\u5bb9\u91cf\u306b\u306f\u5225\u306e\u4e0a\u4e57\u305b\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>\u5fa9\u5143\u3067\u304d\u308b\u65ad\u7247\u6570\u3068\u3001\u8aad\u307f\u66f8\u304d\u3092\u8a31\u3059\u65ad\u7247\u6570\u306f\u5225\u3067\u3001\u30db\u30b9\u30c8\u3084\u30e9\u30c3\u30af\u306e\u6545\u969c\u306b\u8010\u3048\u308b\u306b\u306f\u3001\u65ad\u7247\u306e\u914d\u7f6e\u3082\u5bfe\u5fdc\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>\u6545\u969c\u5f8c\u306f\u6b8b\u3063\u305f\u65ad\u7247\u3092\u8aad\u307f\u3001\u518d\u69cb\u6210\u3057\u3066\u66f8\u304d\u623b\u3059\u305f\u3081\u3001\u5e73\u5e38\u6642\u306e\u5bb9\u91cf\u3060\u3051\u3067\u306a\u304f\u3001\u66f4\u65b0\u306e\u5927\u304d\u3055\u3084\u5fa9\u65e7\u4e2d\u306e\u8ca0\u8377\u307e\u3067\u6bd4\u3079\u3066\u9078\u3073\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>4\uff0b2\u306f\u3001\u30b3\u30d4\u30fc\u3092\u516d\u3064\u4f5c\u308b\u65b9\u5f0f\u3067\u306f\u306a\u3044<\/h2>\n<p>\u4e09\u91cd\u8907\u88fd\u3067\u306f\u3001\u540c\u3058\u30c7\u30fc\u30bf\u306e\u30b3\u30d4\u30fc\u3092\u4e09\u3064\u6301\u3061\u307e\u3059\u3002EC\u3067\u306f\u3001\u5143\u306e\u30c7\u30fc\u30bf\u3092K\u500b\u306e\u30c7\u30fc\u30bf\u65ad\u7247\u306b\u5206\u3051\u3001\u305d\u3053\u304b\u3089M\u500b\u306e\u5fa9\u5143\u7528\u65ad\u7247\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002\u5fa9\u5143\u7528\u65ad\u7247\u306f\u3001\u5143\u30c7\u30fc\u30bf\u3092\u3082\u3046\u4e00\u5ea6\u4e38\u3054\u3068\u4fdd\u5b58\u3057\u305f\u30b3\u30d4\u30fc\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5931\u3063\u305f\u90e8\u5206\u3092\u3001\u6b8b\u3063\u305f\u65ad\u7247\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u6c42\u3081\u308b\u305f\u3081\u306e\u60c5\u5831\u3067\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a> <a href=\"#ref-2\">\uff3b2\uff3d<\/a><\/sup><\/p>\n<p>4\uff0b2\u306a\u3089K\uff1d4\u3001M\uff1d2\u3067\u3059\u3002\u7b26\u53f7\u5316\u3057\u305f\u65ad\u7247\u306e\u5927\u304d\u3055\u3092\u305d\u308d\u3048\u308b\u3068\u3001\u4fdd\u5b58\u3059\u308b\u91cf\u306f<strong>\uff084\uff0b2\uff09\u00f74\uff1d1.5\u500d<\/strong>\u306b\u306a\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u8ad6\u7406\u30c7\u30fc\u30bf1 TiB\u3092\u4fdd\u5b58\u3059\u308b\u5834\u5408\u3001\u7b26\u53f7\u5316\u3057\u305f\u65ad\u7247\u306e\u5408\u8a08\u306f\u7406\u8ad6\u4e0a1.5 TiB\u3001\u4e09\u91cd\u8907\u88fd\u306a\u30893 TiB\u3067\u3059\u3002\u3053\u308c\u306f\u5727\u7e2e\u3084\u91cd\u8907\u6392\u9664\u3067\u4e2d\u8eab\u3092\u5c0f\u3055\u304f\u3057\u305f\u7d50\u679c\u3067\u306f\u306a\u304f\u3001\u6545\u969c\u306b\u5099\u3048\u308b\u60c5\u5831\u306e\u6301\u3061\u65b9\u306b\u3088\u308b\u9055\u3044\u3067\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<div class=\"wp-block-table\" style=\"overflow-x:auto;\">\n<table>\n<caption>\u8ad6\u7406\u30c7\u30fc\u30bf1 TiB\u306b\u5bfe\u3059\u308b\u5bb9\u91cf\u306e\u8a08\u7b97\u4f8b\u3002Ceph\u516c\u5f0f\u6587\u66f8\u306e\u5f0f\u3092\u7528\u3044\u3066Quantum Sea\u304c\u6574\u7406\u3002\u5b9f\u6a5f\u3067\u6e2c\u5b9a\u3057\u305f\u4f7f\u7528\u91cf\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/caption>\n<thead>\n<tr>\n<th>\u4fdd\u5b58\u65b9\u5f0f<\/th>\n<th>\u6301\u3064\u60c5\u5831<\/th>\n<th>\u7406\u8ad6\u4e0a\u306e\u4fdd\u5b58\u91cf<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u4e09\u91cd\u8907\u88fd<\/td>\n<td>\u540c\u3058\u30c7\u30fc\u30bf\u30923\u7d44<\/td>\n<td>1 TiB \u00d7 3\uff1d3 TiB<\/td>\n<\/tr>\n<tr>\n<td>4\uff0b2\u306eEC<\/td>\n<td>\u30c7\u30fc\u30bf4\u65ad\u7247\uff0b\u5fa9\u5143\u75282\u65ad\u7247<\/td>\n<td>1 TiB \u00d7 6\u00f74\uff1d1.5 TiB<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>\u3053\u306e1.5 TiB\u3092\u3001\u305d\u306e\u307e\u307e\u8cfc\u5165\u3059\u3079\u304d\u30c7\u30a3\u30b9\u30af\u5bb9\u91cf\u306b\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u30e1\u30bf\u30c7\u30fc\u30bf\u3001\u30c7\u30fc\u30bf\u914d\u7f6e\u3084\u5fa9\u65e7\u306b\u6b8b\u3059\u7a7a\u304d\u5bb9\u91cf\u3001\u5c0f\u3055\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u683c\u7d0d\u52b9\u7387\u306a\u3069\u306f\u3001\u5225\u306b\u898b\u7a4d\u3082\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u516c\u5f0f\u6587\u66f8\u3082\u3001\u5c0f\u3055\u306a\u30d5\u30a1\u30a4\u30eb\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u591a\u3044\u7528\u9014\u3067\u306f\u3001EC\u306e\u5b9f\u969b\u306e\u5bb9\u91cf\u5897\u52a0\u304c\u5927\u304d\u304f\u306a\u308a\u5f97\u308b\u3068\u6ce8\u610f\u3057\u3066\u3044\u307e\u3059\u3002\u300c\u5229\u7528\u3067\u304d\u308b\u5bb9\u91cf\u304c\u5fc5\u305a2\u500d\u306b\u306a\u308b\u300d\u3068\u7d04\u675f\u3059\u308b\u6570\u5b57\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<h2>\u4e8c\u3064\u5931\u3063\u3066\u3082\u623b\u305b\u308b\u3001\u306e\u300c\u4e8c\u3064\u300d\u306f\u4f55\u304b<\/h2>\n<p>Ceph\u3067\u306f\u3001\u30c7\u30a3\u30b9\u30af\u4e0a\u306e\u30c7\u30fc\u30bf\u3092\u6271\u3046OSD\u3068\u3044\u3046\u4fdd\u5b58\u30b5\u30fc\u30d3\u30b9\u3078\u65ad\u7247\u3092\u914d\u7f6e\u3057\u307e\u3059\u30024\uff0b2\u306e\u69cb\u6210\u3067\u4e8c\u3064\u306e\u65ad\u7247\u3092\u5931\u3063\u3066\u3082\u5fa9\u5143\u3067\u304d\u308b\u3053\u3068\u3068\u3001\u3069\u306e\u4e8c\u53f0\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u6b62\u307e\u3063\u3066\u3082\u3088\u3044\u3053\u3068\u306f\u3001\u540c\u3058\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4f55\u53f0\u5206\u304c\u4e00\u7dd2\u306b\u5931\u308f\u308c\u308b\u304b\u306f\u3001\u7f6e\u304d\u65b9\u3067\u5909\u308f\u308b\u304b\u3089\u3067\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<p>\u305f\u3068\u3048\u3070\u516d\u3064\u306e\u65ad\u7247\u3092\u516d\u3064\u306eOSD\u3078\u7f6e\u3044\u3066\u3044\u3066\u3082\u3001\u305d\u306e\u3046\u3061\u4e09\u3064\u306eOSD\u304c\u540c\u3058\u30db\u30b9\u30c8\u4e0a\u306b\u3042\u308c\u3070\u3001\u30db\u30b9\u30c8\u4e00\u53f0\u306e\u6545\u969c\u3067\u4e09\u65ad\u7247\u3092\u540c\u6642\u306b\u5931\u3044\u307e\u3059\u3002\u30c7\u30a3\u30b9\u30af\u306e\u672c\u6570\u3060\u3051\u3092\u6570\u3048\u3066\u3082\u3001\u30db\u30b9\u30c8\u6545\u969c\u3078\u306e\u5099\u3048\u306f\u5206\u304b\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u914d\u7f6e\u6761\u4ef6\u3092\u8aac\u660e\u3059\u308b\u4eee\u306e\u4f8b\u3067\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u4f7f\u3046\u306e\u304c\u3001Ceph\u306e\u914d\u7f6e\u898f\u5247\u3067\u3042\u308bCRUSH\u306e\u300c\u969c\u5bb3\u30c9\u30e1\u30a4\u30f3\u300d\u3067\u3059\u3002\u969c\u5bb3\u30c9\u30e1\u30a4\u30f3\u3092\u30db\u30b9\u30c8\u306b\u3059\u308c\u3070\u3001\u540c\u3058\u30c7\u30fc\u30bf\u3092\u69cb\u6210\u3059\u308b\u65ad\u7247\u3092\u5225\u3005\u306e\u30db\u30b9\u30c8\u3078\u5206\u3051\u308b\u898f\u5247\u3092\u4f5c\u308c\u307e\u3059\u3002\u30e9\u30c3\u30af\u5168\u4f53\u306e\u505c\u6b62\u3092\u8003\u3048\u308b\u306a\u3089\u3001\u30e9\u30c3\u30af\u5358\u4f4d\u306b\u5206\u3051\u308b\u898f\u5247\u3068\u3001\u305d\u308c\u3092\u6e80\u305f\u3059\u53f0\u6570\u30fb\u69cb\u6210\u304c\u5fc5\u8981\u3067\u3059\u3002\u516c\u5f0f\u6587\u66f8\u306e\u30e9\u30c3\u30af\u914d\u7f6e\u4f8b\u3082\u3001\u540c\u3058\u30e9\u30c3\u30af\u306b\u4e8c\u3064\u306e\u65ad\u7247\u3092\u7f6e\u304b\u306a\u3044\u898f\u5247\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<p>\u901a\u5e38\u306e4\uff0b2\u914d\u7f6e\u3067\u306f\u3001\u5c11\u306a\u304f\u3068\u3082\u516d\u3064\u306e\u969c\u5bb3\u30c9\u30e1\u30a4\u30f3\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u516c\u5f0f\u6587\u66f8\u306f\u3001K\uff0bM\u500b\u3061\u3087\u3046\u3069\u3088\u308a\u3001\u3055\u3089\u306b\u4e00\u3064\u591a\u3044\u969c\u5bb3\u30c9\u30e1\u30a4\u30f3\u3092\u7528\u610f\u3059\u308b\u904b\u7528\u4e0a\u306e\u5229\u70b9\u306b\u3082\u89e6\u308c\u3066\u3044\u307e\u3059\u3002\u5bb9\u91cf\u8868\u3092\u4f5c\u308b\u6bb5\u968e\u3067\u3001\u5fa9\u65e7\u5148\u3068\u306a\u308b\u5834\u6240\u3068\u7a7a\u304d\u5bb9\u91cf\u3092\u5408\u308f\u305b\u3066\u8003\u3048\u308b\u7406\u7531\u3067\u3059\u3002\u30db\u30b9\u30c8\u9593\u306b\u5206\u3051\u305f\u914d\u7f6e\u3092\u3001\u30e9\u30c3\u30af\u9593\u306b\u3082\u5206\u304b\u308c\u3066\u3044\u308b\u3068\u8aad\u307f\u66ff\u3048\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<h2>\u5fa9\u5143\u3067\u304d\u3066\u3082\u3001\u8aad\u307f\u66f8\u304d\u3092\u9032\u3081\u308b\u3068\u306f\u9650\u3089\u306a\u3044<\/h2>\n<p>\u3053\u3053\u3067\u4e8c\u3064\u306e\u6761\u4ef6\u3092\u5206\u3051\u307e\u3059\u3002\u4e00\u3064\u306f\u3001\u5143\u306e\u30c7\u30fc\u30bf\u3092\u518d\u69cb\u6210\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u65ad\u7247\u6570\u3002\u3082\u3046\u4e00\u3064\u306f\u3001\u5229\u7528\u8005\u306e\u8aad\u307f\u66f8\u304d\u3092\u9032\u3081\u308b\u305f\u3081\u306b\u3001Ceph\u304c\u6700\u4f4e\u9650\u305d\u308d\u3048\u308b\u65ad\u7247\u6570\u3067\u3059\u3002<\/p>\n<p>\u516c\u5f0f\u6587\u66f8\u3067\u306f\u3001Octopus\u4ee5\u964d\u306eEC\u30d7\u30fc\u30eb\u306f\u3001\u5c11\u306a\u304f\u3068\u3082K\u500b\u306e\u65ad\u7247\u304c\u5229\u7528\u3067\u304d\u308c\u3070\u5fa9\u65e7\u3092\u9032\u3081\u3089\u308c\u308b\u3068\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u3002\u4e00\u65b9\u3001<code>min_size<\/code>\u306f\u3001\u30c7\u30fc\u30bf\u914d\u7f6e\u306e\u7ba1\u7406\u5358\u4f4d\u3067\u3042\u308bPG\u304c\u52d5\u4f5c\u3057\u3001I\/O\u3092\u9032\u3081\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u6700\u5c0f\u306e\u7a3c\u50cd\u65ad\u7247\u6570\u3067\u3059\u3002Ceph\u306fEC\u3067K\u3088\u308a\u5927\u304d\u3044\u5024\u3092\u52e7\u3081\u3066\u3044\u307e\u3059\u3002K\u500b\u3057\u304b\u6b8b\u3063\u3066\u3044\u306a\u3044\u72b6\u614b\u3067\u3055\u3089\u306b\u65ad\u7247\u3092\u6c38\u4e45\u306b\u5931\u3046\u3068\u3001\u5fa9\u5143\u306b\u5fc5\u8981\u306a\u60c5\u5831\u304c\u8db3\u308a\u306a\u304f\u306a\u308b\u305f\u3081\u3067\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a> <a href=\"#ref-3\">\uff3b3\uff3d<\/a><\/sup><\/p>\n<p>4\uff0b2\u3067<code>min_size=5<\/code>\u3068\u8a2d\u5b9a\u3057\u305f\u4f8b\u306a\u3089\u3001\u65ad\u7247\u304c\u56db\u3064\u6b8b\u3063\u3066\u3044\u3066\u3082\u3001\u8aad\u307f\u66f8\u304d\u3092\u9032\u3081\u308b\u305f\u3081\u306e\u672c\u6570\u306b\u306f\u5c4a\u304d\u307e\u305b\u3093\u3002\u518d\u69cb\u6210\u304c\u53ef\u80fd\u306a\u3053\u3068\u3060\u3051\u3092\u7406\u7531\u306b\u3001\u901a\u5e38\u3069\u304a\u308a\u30b5\u30fc\u30d3\u30b9\u304c\u7d9a\u304f\u3068\u306f\u8a00\u3048\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<div class=\"wp-block-table\" style=\"overflow-x:auto;\">\n<table>\n<caption>4\uff0b2\u3001min_size=5\u306e\u4eee\u306e\u69cb\u6210\u3002\u901a\u5e38\u306eReed\u2013Solomon\u65b9\u5f0f\u3092\u524d\u63d0\u306b\u3057\u305f\u6761\u4ef6\u306e\u6574\u7406\u3067\u3042\u308a\u3001\u5b9f\u74b0\u5883\u306e\u53ef\u7528\u6027\u3092\u4fdd\u8a3c\u3059\u308b\u8868\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/caption>\n<thead>\n<tr>\n<th>\u5229\u7528\u3067\u304d\u308b\u65ad\u7247<\/th>\n<th>\u30c7\u30fc\u30bf\u306e\u518d\u69cb\u6210<\/th>\n<th>min_size\u306e\u672c\u6570\u6761\u4ef6<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>6\u500b<\/td>\n<td>\u5fc5\u8981\u6570\u3092\u6e80\u305f\u3059<\/td>\n<td>\u6e80\u305f\u3059<\/td>\n<\/tr>\n<tr>\n<td>5\u500b<\/td>\n<td>\u5fc5\u8981\u6570\u3092\u6e80\u305f\u3059<\/td>\n<td>\u6e80\u305f\u3059\u3002\u305f\u3060\u3057I\/O\u7d99\u7d9a\u306b\u306f\u4ed6\u306e\u7a3c\u50cd\u6761\u4ef6\u3082\u5fc5\u8981<\/td>\n<\/tr>\n<tr>\n<td>4\u500b<\/td>\n<td>\u5fc5\u8981\u6570\u3092\u6e80\u305f\u3057\u3001\u5fa9\u65e7\u306f\u53ef\u80fd<\/td>\n<td>\u6e80\u305f\u3055\u305a\u3001\u3053\u306e\u72b6\u614b\u306e\u307e\u307eI\/O\u306f\u9032\u3081\u3089\u308c\u306a\u3044<\/td>\n<\/tr>\n<tr>\n<td>3\u500b\u4ee5\u4e0b<\/td>\n<td>\u305d\u306e\u65ad\u7247\u3060\u3051\u3067\u306f\u4e0d\u8db3\u3002\u6b8b\u308a\u3092\u6c38\u4e45\u306b\u5931\u3063\u305f\u306a\u3089\u30c7\u30fc\u30bf\u55aa\u5931<\/td>\n<td>\u6e80\u305f\u3055\u306a\u3044<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>\u3053\u306e\u533a\u5225\u306f\u3001\u4fdd\u5b88\u6642\u306e\u5224\u65ad\u306b\u3082\u95a2\u308f\u308a\u307e\u3059\u3002\u300c\u3042\u3068\u4e8c\u3064\u5931\u3063\u3066\u3082\u30c7\u30fc\u30bf\u306f\u623b\u305b\u308b\u300d\u3068\u3044\u3046\u8aac\u660e\u3060\u3051\u3067\u3001\u4e8c\u3064\u306e\u969c\u5bb3\u30c9\u30e1\u30a4\u30f3\u3092\u540c\u6642\u306b\u6b62\u3081\u3066\u3088\u3044\u3068\u306f\u5224\u65ad\u3067\u304d\u307e\u305b\u3093\u3002\u73fe\u5728\u306e\u65ad\u7247\u306e\u72b6\u614b\u3068<code>min_size<\/code>\u3092\u78ba\u304b\u3081\u3001\u30c7\u30fc\u30bf\u3092\u5b88\u308c\u308b\u7bc4\u56f2\u3068\u30b5\u30fc\u30d3\u30b9\u3092\u7d9a\u3051\u3089\u308c\u308b\u7bc4\u56f2\u3092\u5225\u3005\u306b\u898b\u307e\u3059\u3002<\/p>\n<h2>\u7bc0\u7d04\u3057\u305f\u5bb9\u91cf\u306e\u4ee3\u308f\u308a\u306b\u3001\u5fa9\u65e7\u3067\u306f\u4f55\u3092\u3059\u308b\u306e\u304b<\/h2>\n<p>\u4e09\u91cd\u8907\u88fd\u3067\u30b3\u30d4\u30fc\u3092\u5931\u3063\u305f\u5834\u5408\u306f\u3001\u6b8b\u3063\u305f\u30b3\u30d4\u30fc\u304b\u3089\u4e0d\u8db3\u5206\u3092\u4f5c\u308c\u307e\u3059\u3002EC\u3067\u65ad\u7247\u3092\u5931\u3063\u305f\u5834\u5408\u306f\u3001\u6b8b\u3063\u305f\u65ad\u7247\u3092\u8aad\u307f\u3001\u8a08\u7b97\u3067\u518d\u69cb\u6210\u3057\u3001\u65b0\u3057\u3044\u65ad\u7247\u3092\u66f8\u304d\u8fbc\u307f\u307e\u3059\u3002\u516c\u5f0f\u6587\u66f8\u306f\u3001\u3053\u306e\u8aad\u307f\u53d6\u308a\u30fb\u518d\u69cb\u6210\u30fb\u66f8\u304d\u8fbc\u307f\u3092\u5fa9\u65e7\u306e\u51e6\u7406\u3068\u3057\u3066\u8aac\u660e\u3057\u3001\u3068\u304f\u306bHDD\u3092\u4f7f\u3046\u5834\u5408\u3084\u5fa9\u65e7\u30fb\u518d\u914d\u7f6e\u306e\u6700\u4e2d\u306b\u6027\u80fd\u3068\u306e\u5f15\u304d\u63db\u3048\u304c\u3042\u308b\u3068\u3057\u3066\u3044\u307e\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u9577\u304f\u4fdd\u7ba1\u3059\u308b\u5927\u304d\u306a\u30c7\u30fc\u30bf\u304c\u4e2d\u5fc3\u306a\u3089\u3001\u5e73\u5e38\u6642\u306e\u5bb9\u91cf\u5dee\u306f\u9b45\u529b\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u308c\u3067\u3082\u30db\u30b9\u30c8\u4e00\u53f0\u3092\u5931\u3063\u305f\u5f8c\u306b\u306f\u3001\u6b8b\u308b\u6a5f\u5668\u304c\u901a\u5e38\u306e\u8981\u6c42\u306b\u52a0\u3048\u3066\u5fa9\u65e7\u306e\u8aad\u307f\u53d6\u308a\u3084\u901a\u4fe1\u3092\u53d7\u3051\u6301\u3061\u307e\u3059\u3002\u3053\u3053\u3067\u78ba\u304b\u3081\u305f\u3044\u306e\u306f\u3001\u7a7a\u304d\u5bb9\u91cf\u304c\u8db3\u308a\u308b\u304b\u3060\u3051\u3067\u306a\u304f\u3001\u5fa9\u65e7\u4e2d\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5f85\u3061\u6642\u9593\u3068\u3001\u5197\u9577\u6027\u304c\u623b\u308b\u307e\u3067\u306e\u6642\u9593\u3067\u3059\u3002\u3053\u306e\u8a55\u4fa1\u306e\u9032\u3081\u65b9\u306f\u51e6\u7406\u306e\u4ed5\u7d44\u307f\u304b\u3089\u5c0e\u304f\u3082\u306e\u3067\u3001\u672c\u8a18\u4e8b\u3067\u6e2c\u3063\u305f\u7d50\u679c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>K\u3092\u5897\u3084\u3059\u3068\u3001\u540c\u3058M\u306b\u5bfe\u3059\u308b\u5bb9\u91cf\u306e\u5272\u5408\u306f\u5c0f\u3055\u304f\u306a\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u914d\u7f6e\u306b\u5fc5\u8981\u306a\u969c\u5bb3\u30c9\u30e1\u30a4\u30f3\u3082\u5897\u3048\u3001\u6027\u80fd\u3078\u306e\u5f71\u97ff\u3082\u5909\u308f\u308a\u307e\u3059\u3002\u5bb9\u91cf\u52b9\u7387\u306e\u6570\u5b57\u3060\u3051\u3092\u6700\u5c0f\u306b\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u5b9f\u969b\u306e\u8aad\u307f\u66f8\u304d\u3068\u6545\u969c\u5fa9\u65e7\u3092\u540c\u3058\u6761\u4ef6\u3067\u6bd4\u3079\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<h2>\u5c0f\u3055\u306a\u66f4\u65b0\u3068\u30e1\u30bf\u30c7\u30fc\u30bf\u306b\u306f\u3001\u5225\u306e\u6761\u4ef6\u304c\u3042\u308b<\/h2>\n<p>Ceph\u306e\u4fdd\u5b58\u9818\u57df\u306f\u30d7\u30fc\u30eb\u3068\u3044\u3046\u5358\u4f4d\u3067\u65b9\u5f0f\u3092\u9078\u3073\u307e\u3059\u3002EC\u30d7\u30fc\u30eb\u306f\u3001\u521d\u671f\u72b6\u614b\u3067\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5168\u4f53\u306e\u66f8\u304d\u8fbc\u307f\u3084\u8ffd\u8a18\u3092\u6271\u3044\u307e\u3059\u3002\u4e00\u90e8\u3060\u3051\u3092\u66f8\u304d\u63db\u3048\u308b\u306b\u306f\u3001BlueStore\u3068\u3044\u3046\u4fdd\u5b58\u65b9\u5f0f\u306eOSD\u3092\u4f7f\u3044\u3001<code>allow_ec_overwrites<\/code>\u3092\u6709\u52b9\u306b\u3059\u308b\u6761\u4ef6\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u4eee\u60f3\u30c7\u30a3\u30b9\u30af\u3092\u6271\u3046RBD\u3084\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u6271\u3046CephFS\u306e\u30c7\u30fc\u30bf\u306b\u3082EC\u3092\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<p>\u305f\u3060\u3057\u3001EC\u30d7\u30fc\u30eb\u306f\u30ad\u30fc\u3068\u5024\u306e\u60c5\u5831\u3092\u6301\u3064<code>omap<\/code>\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002RBD\u3084CephFS\u3067\u306f\u3001\u30c7\u30fc\u30bf\u3092EC\u30d7\u30fc\u30eb\u306b\u7f6e\u3044\u3066\u3082\u3001\u30e1\u30bf\u30c7\u30fc\u30bf\u306f\u8907\u88fd\u30d7\u30fc\u30eb\u306b\u6b8b\u3057\u307e\u3059\u3002\u300c\u4fdd\u5b58\u9818\u57df\u3092\u5168\u90e84\uff0b2\u3078\u5909\u3048\u308b\u300d\u3068\u3044\u3046\u4e00\u62ec\u306e\u8a08\u7b97\u3067\u306f\u3001\u3053\u306e\u5f79\u5272\u5206\u62c5\u3092\u898b\u843d\u3068\u3057\u307e\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<p>Tentacle\u7cfb\u5217\u306b\u306f\u3001\u3053\u308c\u3068\u306f\u5225\u306b<code>allow_ec_optimizations<\/code>\u304c\u3042\u308a\u307e\u3059\u3002\u5c0f\u3055\u306aI\/O\u306e\u6027\u80fd\u3092\u6539\u5584\u3057\u3001\u5bb9\u91cf\u3092\u57cb\u3081\u5408\u308f\u305b\u308b\u30d1\u30c7\u30a3\u30f3\u30b0\u3092\u306a\u304f\u3059\u6700\u9069\u5316\u3067\u3059\u304c\u3001\u4e00\u90e8\u4e0a\u66f8\u304d\u306e\u8a31\u53ef\u3068\u540c\u3058\u8a2d\u5b9a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3059\u3079\u3066\u306eMON\uff08\u30af\u30e9\u30b9\u30bf\u72b6\u614b\u3092\u7ba1\u7406\u3059\u308b\u30b5\u30fc\u30d3\u30b9\uff09\u3068OSD\u304cTentacle\u4ee5\u964d\u3067\u3042\u308b\u3053\u3068\u306b\u52a0\u3048\u3001\u5bfe\u8c61\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3068\u7b26\u53f7\u5316\u65b9\u5f0f\u306b\u3082\u6761\u4ef6\u304c\u3042\u308a\u3001\u6709\u52b9\u306b\u3057\u305f\u5f8c\u306f\u7121\u52b9\u3078\u623b\u305b\u307e\u305b\u3093\u3002\u516c\u5f0f\u6587\u66f8\u304c\u6319\u3052\u308b\u5bfe\u8c61\u306fJerasure\uff0fISA-L\u306e<code>reed_sol_van<\/code>\u65b9\u5f0f\u3067\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a><\/sup><\/p>\n<p>1\u30b9\u30c8\u30e9\u30a4\u30d7\u3042\u305f\u308a\u5404\u30c7\u30fc\u30bf\u65ad\u7247\u3078\u5272\u308a\u5f53\u3066\u308b\u91cf\u3092\u6c7a\u3081\u308b<code>stripe_unit<\/code>\u3082\u3001\u8aad\u307f\u66f8\u304d\u306e\u6027\u8cea\u306b\u95a2\u308f\u308a\u307e\u3059\u3002\u6700\u9069\u5316\u3092\u4f7f\u3046\u5834\u5408\u3001\u5024\u3092\u5927\u304d\u304f\u3059\u308b\u3068\u5c0f\u3055\u306a\u8aad\u307f\u53d6\u308a\u306b\u5229\u70b9\u304c\u3042\u308b\u4e00\u65b9\u3001\u5c0f\u3055\u306a\u9023\u7d9a\u66f8\u304d\u8fbc\u307f\u306b\u306f\u4e0d\u5229\u306b\u306a\u308b\u3068\u8aac\u660e\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u5024\u306f\u30d7\u30fc\u30eb\u4f5c\u6210\u5f8c\u306b\u306f\u5909\u66f4\u3067\u304d\u307e\u305b\u3093\u3002\u65e2\u5b58\u30d7\u30fc\u30eb\u3078\u6700\u9069\u5316\u3092\u6709\u52b9\u306b\u3059\u308c\u3070\u3001\u3069\u306e\u4ed5\u4e8b\u3082\u540c\u3058\u3088\u3046\u306b\u901f\u304f\u306a\u308b\u3001\u3068\u306f\u8aad\u307e\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<sup class=\"source-note\"><a href=\"#ref-1\">\uff3b1\uff3d<\/a> <a href=\"#ref-2\">\uff3b2\uff3d<\/a><\/sup><\/p>\n<h2>\u5bb9\u91cf\u3001\u6545\u969c\u306e\u7bc4\u56f2\u3001\u623b\u308b\u307e\u3067\u306e\u8ca0\u8377\u3092\u4e00\u7d44\u3067\u6bd4\u3079\u308b<\/h2>\n<p>\u65b9\u5f0f\u3092\u9078\u3076\u306a\u3089\u3001\u307e\u305a\u4fdd\u5b58\u3059\u308b\u30c7\u30fc\u30bf\u306e\u5927\u304d\u3055\u3068\u3001\u4e00\u56de\u306e\u8aad\u307f\u66f8\u304d\u306e\u5927\u304d\u3055\u3092\u5206\u3051\u3066\u6349\u3048\u307e\u3059\u3002\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u3067\u3082\u3001\u305d\u306e\u4e00\u90e8\u3092\u7d30\u304b\u304f\u66f4\u65b0\u3059\u308b\u4ed5\u4e8b\u306f\u3042\u308a\u307e\u3059\u3002\u6b21\u306b\u3001\u5b88\u308a\u305f\u3044\u6545\u969c\u306e\u5358\u4f4d\u306b\u5408\u308f\u305b\u3066\u65ad\u7247\u306e\u914d\u7f6e\u3092\u8003\u3048\u3001<code>min_size<\/code>\u3092\u542b\u3080\u505c\u6b62\u6761\u4ef6\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001\u4ee3\u8868\u7684\u306a\u8ca0\u8377\u3092\u304b\u3051\u305f\u5e73\u5e38\u6642\u3068\u5fa9\u65e7\u4e2d\u3067\u3001\u5fc5\u8981\u5bb9\u91cf\u30fb\u5fdc\u7b54\u6642\u9593\u30fb\u5fa9\u65e7\u6642\u9593\u3092\u6bd4\u3079\u307e\u3059\u3002<\/p>\n<p>4\uff0b2\u306e1.5\u500d\u3068\u3044\u3046\u8a08\u7b97\u306f\u3001\u3053\u306e\u6bd4\u8f03\u306e\u51fa\u767a\u70b9\u3067\u3059\u3002\u5bb9\u91cf\u306e\u5229\u70b9\u3092\u751f\u304b\u305b\u308b\u306e\u306f\u3001\u6e1b\u3089\u3057\u305f\u8907\u88fd\u306e\u4ee3\u308f\u308a\u306b\u5fc5\u8981\u306b\u306a\u308b\u914d\u7f6e\u3068\u518d\u69cb\u6210\u306e\u4ed5\u4e8b\u307e\u3067\u3001\u904b\u7528\u306e\u4e2d\u3078\u7e54\u308a\u8fbc\u3081\u305f\u3068\u304d\u3067\u3059\u3002<\/p>\n<h2>\u53c2\u8003\u8cc7\u6599<\/h2>\n<p>2026\u5e7410\u670812\u65e5\u78ba\u8a8d\u3002Ceph\u516c\u5f0f\u306eTentacle\u7cfb\u5217\u306e\u6587\u66f8\u306b\u57fa\u3065\u304f\u65b9\u5f0f\u306e\u89e3\u8aac\u3067\u3059\u3002\u5bb9\u91cf\u3068\u65ad\u7247\u6570\u306e\u8868\u306f\u6761\u4ef6\u3092\u793a\u3059\u8a08\u7b97\u4f8b\u3067\u3001\u5b9f\u6a5f\u306e\u6027\u80fd\u8a66\u9a13\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<ol>\n<li id=\"ref-1\">Ceph authors and contributors, <a href=\"https:\/\/docs.ceph.com\/en\/tentacle\/rados\/operations\/erasure-code\/\">Erasure code<\/a>\u3002Erasure-code profiles\u3001Erasure Coding with Overwrites\u3001Erasure Coding Optimizations\u3001Erasure-coded pool overhead\u3001Erasure-coded pool recovery\u3002<\/li>\n<li id=\"ref-2\">Ceph authors and contributors, <a href=\"https:\/\/docs.ceph.com\/en\/tentacle\/rados\/operations\/erasure-code-profile\/\">Erasure code profiles<\/a>\u3002K\u30fbM\u306e\u5b9a\u7fa9\u3068<code>stripe_unit<\/code>\u3002<\/li>\n<li id=\"ref-3\">Ceph authors and contributors, <a href=\"https:\/\/docs.ceph.com\/en\/tentacle\/rados\/operations\/pools\/\">Pools<\/a>\u3002Setting Pool Values\u306e<code>min_size<\/code>\u3001<code>allow_ec_overwrites<\/code>\u3001<code>allow_ec_optimizations<\/code>\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u540c\u3058\u30c7\u30fc\u30bf\u3092\u4e09\u3064\u305a\u3064\u4fdd\u5b58\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001\u7d30\u304b\u304f\u5206\u3051\u3066\u5fa9\u5143\u7528\u306e\u60c5\u5831\u3092\u6dfb\u3048\u308c\u3070\u3001\u5fc5\u8981\u306a\u5bb9\u91cf\u3092\u6e1b\u3089\u305b\u307e\u3059\u3002\u305f\u3060\u3001\u7a7a\u304d\u5bb9\u91cf\u304c\u5897\u3048\u308b\u3053\u3068\u3068\u3001\u6545\u969c\u4e2d\u3082\u540c\u3058\u901f\u3055\u3067\u4f7f\u3044\u7d9a\u3051\u3089\u308c\u308b\u3053\u3068\u306f\u5225\u3067\u3059\u3002 \u5206\u6563\u30b9\u30c8\u30ec\u30fc\u30b8\u306eCeph\u306b\u306f\u3001\u30a4\u30ec\u30a4\u30b8\u30e3\u30fc\u30b3 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":870,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[30],"tags":[89,231],"class_list":["post-871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-computing","tag-ceph","tag-erasure-coding"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-research-ceph-erasure-coding-20261012-featured-d1b440c499d1.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/871","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=871"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/871\/revisions"}],"predecessor-version":[{"id":880,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/871\/revisions\/880"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/870"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=871"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=871"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}