$ sysctl -a | grep dirty\r\nvm.dirty_background_ratio = 10\r\nvm.dirty_background_bytes = 0\r\nvm.dirty_ratio = 20\r\nvm.dirty_bytes = 0\r\nvm.dirty_writeback_centisecs = 500\r\nvm.dirty_expire_centisecs = 3000<\/pre>\n

\u200bvm.dirty_background_ratio\u662f\u5728 pdflush\/flush\/kdmflush \u540e\u53f0\u8fdb\u7a0b\u542f\u52a8\u5c06\u5176\u5199\u5165\u78c1\u76d8\u4e4b\u524d\uff0c\u53ef\u4ee5\u7528\u201c\u810f\u201d\u9875\uff08\u4ecd\u9700\u8981\u5199\u5165\u78c1\u76d8\u7684\u5185\u5b58\u9875\uff09\u586b\u5145\u7684\u7a7a\u95f2\u5185\u5b58\u548c\u7f13\u5b58\u548c\u7684\u767e\u5206\u6bd4\u3002\u6211\u7684\u4f8b\u5b50\u662f 10%\uff0c\u6240\u4ee5\u5982\u679c\u6211\u7684\u865a\u62df\u670d\u52a1\u5668\u6709 32 GB \u7684\u5185\u5b58\uff0c\u90a3\u5c31\u662f 3.2 GB \u7684\u6570\u636e\uff0c\u53ef\u4ee5\u5728\u5b8c\u6210\u67d0\u4e9b\u64cd\u4f5c\u4e4b\u524d\u9a7b\u7559\u5728 RAM \u4e2d\u3002vm.dirty_ratio \u662f\u5728\u5fc5\u987b\u5c06\u6240\u6709\u5185\u5bb9\u63d0\u4ea4\u5230\u78c1\u76d8\u4e4b\u524d\u53ef\u4ee5\u7528\u810f\u9875\u586b\u5145\u7684\u7edd\u5bf9\u6700\u5927\u7cfb\u7edf\u5185\u5b58\u91cf\u3002\u5f53\u7cfb\u7edf\u5230\u8fbe\u6b64\u65f6\uff0c\u6240\u6709\u65b0\u7684 I\/O \u5757\uff0c\u76f4\u5230\u810f\u9875\u5df2\u5199\u5165\u78c1\u76d8\u3002\u8fd9\u901a\u5e38\u662f\u957f\u65f6\u95f4 I\/O \u6682\u505c\u7684\u6839\u6e90\uff0c\u4f46\u53ef\u4ee5\u9632\u6b62\u5728\u5185\u5b58\u4e2d\u4e0d\u5b89\u5168\u5730\u7f13\u5b58\u8fc7\u591a\u6570\u636e\u3002vm.dirty_background_bytes\u548cvm.dirty_bytes\u662f\u6307\u5b9a\u8fd9\u4e9b\u53c2\u6570\u7684\u53e6\u4e00\u79cd\u65b9\u6cd5\u3002\u5982\u679c\u8bbe\u7f6e_bytes\u7248\u672c\uff0c\u5219_ratio\u7248\u672c\u5c06\u53d8\u4e3a 0\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002vm.dirty_expire_centisecs\u662f\u67d0\u4e9b\u5185\u5bb9\u5728\u9700\u8981\u5199\u5165\u4e4b\u524d\u53ef\u4ee5\u5728\u7f13\u5b58\u4e2d\u5b58\u5728\u591a\u957f\u65f6\u95f4\u3002\u5728\u672c\u4f8b\u4e2d\u4e3a 30 \u79d2\u3002\u5f53 pdflush\/flush\/kdmflush \u8fdb\u7a0b\u542f\u52a8\u65f6\uff0c\u5b83\u4eec\u5c06\u68c0\u67e5\u810f\u9875\u7684\u5e74\u9f84\uff0c\u5982\u679c\u5b83\u65e9\u4e8e\u6b64\u503c\uff0c\u5b83\u5c06\u5f02\u6b65\u5199\u5165\u78c1\u76d8\u3002\u7531\u4e8e\u5728\u5185\u5b58\u4e2d\u4fdd\u5b58\u810f\u9875\u662f\u4e0d\u5b89\u5168\u7684\uff0c\u8fd9\u4e5f\u662f\u9632\u6b62\u6570\u636e\u4e22\u5931\u7684\u4e00\u79cd\u4fdd\u62a4\u63aa\u65bd\u3002vm.dirty_writeback_centisecs\u662f pdflush\/flush\/kdmflush \u8fdb\u7a0b\u5524\u9192\u5e76\u68c0\u67e5\u662f\u5426\u9700\u8981\u5b8c\u6210\u5de5\u4f5c\u7684\u9891\u7387\u3002\u200b\u60a8\u8fd8\u53ef\u4ee5\u5728 \/proc\/vmstat \u4e2d\u67e5\u770b\u6709\u5173\u9875\u9762\u7f13\u5b58\u7684\u7edf\u8ba1\u4fe1\u606f\uff1a<\/p>\n

$ cat \/proc\/vmstat | egrep \"dirty|writeback\"\r\nnr_dirty 878\r\nnr_writeback 0\r\nnr_writeback_temp 0<\/pre>\n

\u5c31\u6211\u800c\u8a00\uff0c\u6211\u6709 878 \u4e2a\u810f\u9875\u7b49\u5f85\u5199\u5165\u78c1\u76d8\u3002\u65b9\u6cd5 1\uff1a\u51cf\u5c11\u7f13\u5b58\u4e0e\u8ba1\u7b97\u673a\u4e16\u754c\u4e2d\u7684\u5927\u591a\u6570\u4e8b\u60c5\u4e00\u6837\uff0c\u5982\u4f55\u8c03\u6574\u8fd9\u4e9b\u53d6\u51b3\u4e8e\u60a8\u8981\u505a\u4ec0\u4e48\u3002\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u6709\u5feb\u901f\u78c1\u76d8\u5b50\u7cfb\u7edf\uff0c\u5b83\u4eec\u6709\u81ea\u5df1\u7684\u5927\u578b\u7535\u6c60\u5907\u4efd NVRAM \u7f13\u5b58\uff0c\u56e0\u6b64\u5c06\u5185\u5bb9\u4fdd\u7559\u5728\u64cd\u4f5c\u7cfb\u7edf\u9875\u9762\u7f13\u5b58\u4e2d\u662f\u6709\u98ce\u9669\u7684\u3002\u8ba9\u6211\u4eec\u5c1d\u8bd5\u66f4\u53ca\u65f6\u5730\u5c06 I\/O \u53d1\u9001\u5230\u9635\u5217\uff0c\u5e76\u51cf\u5c11\u6211\u4eec\u7684\u672c\u5730\u64cd\u4f5c\u7cfb\u7edf\uff08\u501f\u7528\u670d\u52a1\u884c\u4e1a\u7684\u4e00\u53e5\u8bdd\uff09\u201c\u9677\u5165\u56f0\u5883\u201d\u7684\u53ef\u80fd\u6027\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u901a\u8fc7\u5411 \/etc\/sysctl.conf \u6dfb\u52a0\u65b0\u6570\u5b57\u5e76\u4f7f\u7528 \u201csysctl \u2013p\u201d \u91cd\u65b0\u52a0\u8f7d\u6765\u964d\u4f4evm.dirty_background_ratio\u548cvm.dirty_ratio\uff1a<\/p>\n

vm.dirty_background_ratio = 5\r\nvm.dirty_ratio = 10<\/pre>\n

\u8fd9\u662f\u865a\u62df\u673a\u4ee5\u53ca\u57fa\u4e8e Linux \u7684\u865a\u62df\u673a\u7ba1\u7406\u7a0b\u5e8f\u7684\u5178\u578b\u65b9\u6cd5\u3002\u6211\u4e0d\u5efa\u8bae\u5c06\u8fd9\u4e9b\u53c2\u6570\u8bbe\u7f6e\u4e3a\u96f6\uff0c\u56e0\u4e3a\u67d0\u4e9b\u540e\u53f0 I\/O \u53ef\u4ee5\u5c06\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u4e0e\u78c1\u76d8\u9635\u5217\u548c SAN \u4e0a\u77ed\u65f6\u95f4\u7684\u9ad8\u5ef6\u8fdf\uff08\u201c\u5cf0\u503c\u201d\uff09\u5206\u79bb\u3002\u65b9\u6cd5 2\uff1a\u589e\u52a0\u7f13\u5b58\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u663e\u8457\u63d0\u9ad8\u7f13\u5b58\u4f1a\u5bf9\u6027\u80fd\u4ea7\u751f\u79ef\u6781\u5f71\u54cd\u3002\u5728\u8fd9\u4e9b\u60c5\u51b5\u4e0b\uff0cLinux \u6765\u5bbe\u4e0a\u5305\u542b\u7684\u6570\u636e\u5e76\u4e0d\u91cd\u8981\u5e76\u4e14\u53ef\u80fd\u4f1a\u4e22\u5931\uff0c\u5e76\u4e14\u901a\u5e38\u662f\u5e94\u7528\u7a0b\u5e8f\u91cd\u590d\u6216\u4ee5\u53ef\u91cd\u590d\u7684\u7a81\u53d1\u65b9\u5f0f\u5199\u5165\u76f8\u540c\u7684\u6587\u4ef6\u3002\u4ece\u7406\u8bba\u4e0a\u8bb2\uff0c\u901a\u8fc7\u5141\u8bb8\u5185\u5b58\u4e2d\u5b58\u5728\u66f4\u591a\u7684\u810f\u9875\uff0c\u60a8\u5c06\u5728\u7f13\u5b58\u4e2d\u4e00\u904d\u53c8\u4e00\u904d\u5730\u91cd\u5199\u76f8\u540c\u7684\u5757\uff0c\u5e76\u4e14\u53ea\u9700\u8981\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4\u5bf9\u5b9e\u9645\u78c1\u76d8\u8fdb\u884c\u4e00\u6b21\u5199\u5165\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u63d0\u9ad8\u4e86\u53c2\u6570\uff1a<\/p>\n

vm.dirty_background_ratio = 50\r\nvm.dirty_ratio = 80<\/pre>\n\n\n\u6709\u65f6\u4eba\u4eec\u8fd8\u4f1a\u589e\u52a0 vm.dirty_expire_centisecs \u53c2\u6570\u4ee5\u5141\u8bb8\u7f13\u5b58\u4e2d\u66f4\u591a\u65f6\u95f4\u3002\u9664\u4e86\u6570\u636e\u4e22\u5931\u7684\u98ce\u9669\u589e\u52a0\u4e4b\u5916\uff0c\u5982\u679c\u7f13\u5b58\u5df2\u6ee1\u5e76\u9700\u8981\u8f6c\u50a8\uff0c\u8fd8\u9762\u4e34\u957f\u65f6\u95f4 I\/O \u6682\u505c\u7684\u98ce\u9669\uff0c\u56e0\u4e3a\u5728\u5927\u578b VM \u4e0a\uff0c\u7f13\u5b58\u4e2d\u4f1a\u6709\u5927\u91cf\u6570\u636e\u3002\u65b9\u6cd53\uff1a\u53cc\u5411\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u7cfb\u7edf\u5fc5\u987b\u5904\u7406\u4e0d\u9891\u7e41\u7684\u7a81\u53d1\u6d41\u91cf\u5230\u6162\u901f\u78c1\u76d8\uff08\u6574\u70b9\u9876\u90e8\u7684\u6279\u5904\u7406\u4f5c\u4e1a\u3001\u5348\u591c\u3001\u5199\u5165 Raspberry Pi \u4e0a\u7684 SD \u5361\u7b49\uff09\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e00\u79cd\u65b9\u6cd5\u53ef\u80fd\u662f\u5141\u8bb8\u5c06\u6240\u6709\u5199\u5165 I\/O \u5b58\u653e\u5728\u7f13\u5b58\u4e2d\uff0c\u4ee5\u4fbf\u540e\u53f0\u5237\u65b0\u64cd\u4f5c\u53ef\u4ee5\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\u5f02\u6b65\u5904\u7406\u5b83\uff1a<\/p>\n
vm.dirty_background_ratio = 5\r\nvm.dirty_ratio = 80<\/pre>\n\u5728\u8fd9\u91cc\uff0c\u540e\u53f0\u8fdb\u7a0b\u5728\u8fbe\u5230 5% \u7684\u4e0a\u9650\u65f6\u5c06\u7acb\u5373\u5f00\u59cb\u5199\u5165\uff0c\u4f46\u7cfb\u7edf\u4e0d\u4f1a\u5f3a\u5236\u540c\u6b65 I\/O\uff0c\u76f4\u5230\u5b83\u8fbe\u5230 80% \u6ee1\u3002\u4ece\u90a3\u91cc\uff0c\u60a8\u53ea\u9700\u8c03\u6574\u7cfb\u7edfRAM\u7684\u5927\u5c0f\uff0cvm.dirty_ratio\u5c31\u53ef\u4ee5\u6d88\u8017\u6240\u6709\u5199\u5165\u7684\u6570\u636e\u3002\u540c\u6837\uff0c\u78c1\u76d8\u4e0a\u7684\u6570\u636e\u4e00\u81f4\u6027\u9700\u8981\u6743\u8861\uff0c\u8fd9\u8f6c\u5316\u4e3a\u6570\u636e\u98ce\u9669\u3002\u8d2d\u4e70 UPS \u5e76\u786e\u4fdd\u60a8\u53ef\u4ee5\u5728 UPS \u65ad\u7535\u4e4b\u524d\u8f6c\u50a8\u7f13\u5b58\u3002:)\u65e0\u8bba\u60a8\u9009\u62e9\u54ea\u79cd\u8def\u7ebf\uff0c\u60a8\u90fd\u5e94\u8be5\u59cb\u7ec8\u6536\u96c6\u786c\u6570\u636e\u6765\u652f\u6301\u60a8\u7684\u66f4\u6539\uff0c\u5e76\u5e2e\u52a9\u60a8\u786e\u5b9a\u662f\u6b63\u5728\u6539\u8fdb\u8fd8\u662f\u4f7f\u4e8b\u60c5\u53d8\u5f97\u66f4\u7cdf\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u4ee5\u4ece\u8bb8\u591a\u4e0d\u540c\u7684\u4f4d\u7f6e\u83b7\u53d6\u6570\u636e\uff0c\u5305\u62ec\u5e94\u7528\u7a0b\u5e8f\u672c\u8eab\u3001\/proc\/vmstat\u3001\/proc\/meminfo\u3001iostat\u3001vmstat \u4ee5\u53ca \/proc\/sys\/vm \u4e2d\u7684\u8bb8\u591a\u5185\u5bb9\u3002\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u810f\u9875\u914d\u7f6e\u4e5f\u662f\u4e00\u79cd\u827a\u672f\uff0c\u9700\u8981\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u4e0b\u8c03\u6574\uff0c\u6ce8\u610fvm.dirty_background_ratio\u914d\u7f6e\u7684\u6bd4\u4f8b\u662f\u7f13\u5b58\u548c\u7a7a\u95f2\u5185\u5b58\u7684\u6bd4\u4f8b\uff0cvm.dirty_ratio\u662f\u603b\u5185\u5b58\u7684\u6bd4\u4f8b\u3002<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
\u6211\u4eec\u8ba8\u8bba\u4e86Linux\u5ba2\u6237\u673a\u4e0a\u7684\u5185\u5b58\u5982\u4f55\u7528\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u672c\u8eab\uff08\u5185\u6838\uff0c\u7f13\u51b2\u533a\u7b49\uff09\uff0c\u5e94\u7528\u7a0b\u5e8f\u4ee5\u53ca\u6587\u4ef6\u7f13\u5b58\u3002\u6587\u4ef6\u7f13\u5b58\u662f\u4e00\u9879 […]<\/p>\n","protected":false},"author":323,"featured_media":260403,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-261080","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts\/261080","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/users\/323"}],"replies":[{"embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/comments?post=261080"}],"version-history":[{"count":2,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts\/261080\/revisions"}],"predecessor-version":[{"id":261082,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts\/261080\/revisions\/261082"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/media\/260403"}],"wp:attachment":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/media?parent=261080"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/categories?post=261080"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/tags?post=261080"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}