{"id":1072,"date":"2022-02-11T22:17:38","date_gmt":"2022-02-11T14:17:38","guid":{"rendered":"https:\/\/www.myway5.com\/?p=1072"},"modified":"2023-07-05T10:01:58","modified_gmt":"2023-07-05T02:01:58","slug":"hdd-performance","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2022\/02\/11\/hdd-performance\/","title":{"rendered":"\u673a\u68b0\u786c\u76d8\u7684\u6027\u80fd\u8bc4\u4f30"},"content":{"rendered":"<h2>\u6982\u8ff0<\/h2>\n<p>\u4ece\u4e2a\u4eba PC \u5230\u6570\u636e\u4e2d\u5fc3\uff0c\u673a\u68b0\u786c\u76d8\u90fd\u626e\u6f14\u7740\u4e0d\u53ef\u6216\u7f3a\u7684\u89d2\u8272\u3002\u4ece\u6027\u80fd\u3001\u5b58\u50a8\u5bb9\u91cf\u7b49\u65b9\u9762\u6765\u8003\u8651\uff0c\u673a\u68b0\u786c\u76d8\u4e00\u76f4\u90fd\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u673a\u68b0\u786c\u76d8\u7684\u6027\u80fd\u8bc4\u4f30\u65b9\u5f0f\u4e5f\u5f88\u6709\u5fc5\u8981\u3002<\/p>\n<h2>\u673a\u68b0\u786c\u76d8\u7684\u7ec4\u6210\u7ed3\u6784<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2022\/02\/screenshot-20220209-233208.png\" alt=\"\" \/><\/p>\n<p>\u4ece\u7269\u7406\u89c6\u89d2\u6765\u770b\uff0c\u4e3b\u8981\u7ec4\u4ef6\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u76d8\u7247(Platter): \u4e00\u4e2a\u673a\u68b0\u786c\u76d8\u4e00\u822c\u7531\u591a\u4e2a\u76d8\u7247\u7ec4\u6210\uff0c\u6bcf\u4e2a\u76d8\u7247\u90fd\u6709\u4e24\u9762\uff0c\u6bcf\u4e00\u9762\u90fd\u53ef\u4ee5\u5b58\u50a8\u6570\u636e\u3002<\/li>\n<li>\u8f6c\u8f74(Spindle): \u8f6c\u8f74\u4f1a\u8fde\u63a5\u5230\u4e00\u4e2a\u7535\u673a\u4e0a\uff0c\u9a71\u52a8\u76d8\u7247\u7684\u8f6c\u52a8\u3002\u5e38\u89c1\u7684\u8f6c\u901f\u6709\uff1a5400 rpm, 7200 rpm, 10000 rpm \u548c 15000 rpm\u3002<\/li>\n<li>\u8bfb\u5199\u78c1\u5934(Read\/Write Head): \u6bcf\u4e2a\u76d8\u7247\u7684\u9762\u90fd\u6709\u4e00\u4e2a\u5bf9\u5e94\u7684\u8bfb\u5199\u78c1\u5934\uff0c\u8d1f\u8d23\u5728\u8be5\u76d8\u9762\u4e0a\u8fdb\u884c\u8bfb\u5199\u3002<\/li>\n<li>\u673a\u68b0\u81c2\u6746(Actuator Arm): \u78c1\u5934\u8fde\u63a5\u5230\u673a\u68b0\u81c2\u6746\u4e0a\uff0c\u6240\u6709\u78c1\u5934\u5728\u4e0d\u540c\u7684\u78c1\u9053\u4e0a\u79fb\u52a8\u65f6\u662f\u540c\u6b65\u7684\u3002<\/li>\n<li>\u9a71\u52a8\u63a7\u5236\u4e3b\u677f\uff1a\u4e0a\u9762\u5305\u62ec\u4e86\u5fae\u4fe1\u5904\u7406\u5668\uff0c\u5185\u5b58\uff0c\u7535\u8def\u4ee5\u53ca\u4e00\u4e9b\u56fa\u4ef6\u3002\u8fd9\u4e9b\u56fa\u4ef6\u8d1f\u8d23\u63a7\u5236\u8f6c\u8f74\u7535\u673a\u7684\u7535\u6e90\uff0c\u7535\u673a\u7684\u901f\u5ea6\u3002\u540c\u65f6\u4e5f\u63a7\u5236\u4e86\u786c\u76d8\u548c\u4e3b\u673a\u7684\u901a\u4fe1\u3002\u6b64\u5916\uff0c\u901a\u8fc7\u79fb\u52a8\u78c1\u5934\uff0c\u4ee5\u53ca\u5728\u4e0d\u540c\u78c1\u5934\u95f4\u7684\u5207\u6362\u6765\u63a7\u5236\u786c\u76d8\u7684\u8bfb\u5199\u64cd\u4f5c\u3002<\/li>\n<\/ol>\n<p>\u4ece\u903b\u8f91\u89c6\u89d2\u6765\u770b\uff1a<\/p>\n<ol>\n<li>\u78c1\u9053\uff1a\u76d8\u7247\u7684\u6bcf\u4e00\u9762\u4e0a\u90fd\u6709\u591a\u4e2a\u78c1\u9053\uff0c\u6bcf\u4e2a\u78c1\u9053\u90fd\u662f\u4e00\u4e2a\u540c\u5fc3\u5706\u3002<\/li>\n<li>\u6247\u533a\uff1a\u6bcf\u4e2a\u78c1\u9053\u88ab\u5212\u5206\u6210\u591a\u4e2a\u6247\u533a\u3002<\/li>\n<\/ol>\n<p>\u8be6\u7ec6\u4fe1\u606f\u53ef\u53c2\u8003\uff1ahttps:\/\/www.jianshu.com\/p\/cf100e39ccdf<\/p>\n<h2>\u6027\u80fd\u8bc4\u4f30\u7ef4\u5ea6<\/h2>\n<h3>\u5bfb\u9053\u65f6\u95f4(Seek Time)<\/h3>\n<p>\u673a\u68b0\u786c\u76d8\u5728\u8bfb\u5199\u6570\u636e\u65f6\uff0c\u9996\u5148\u9700\u8981\u5c06\u78c1\u5934\u79fb\u52a8\u5230\u6307\u5b9a\u7684\u78c1\u9053\u4e0a\u3002\u8fd9\u4e2a\u65f6\u95f4\u4e3a Seek Time\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u673a\u68b0\u786c\u76d8\u7684\u5382\u5546\u4f1a\u63d0\u4f9b\u4ee5\u4e0b\u51e0\u4e2a\u573a\u666f\u7684 Seek Time \u53c2\u6570\uff1a<\/p>\n<ul>\n<li><strong>Full Stroke:<\/strong> \u8fd9\u4e2a\u65f6\u95f4\u7528\u6765\u63cf\u8ff0\u78c1\u5934\u4ece\u6700\u91cc\u9762\u7684\u78c1\u9053\u79fb\u52a8\u5230\u6700\u5916\u9762\u7684\u78c1\u9053\u6240\u9700\u8981\u7684\u65f6\u95f4\u3002<\/li>\n<li><strong>Average:<\/strong> \u4ece\u968f\u673a\u7684\u78c1\u9053\u79fb\u52a8\u5230\u53e6\u4e00\u4e2a\u78c1\u9053\u6240\u9700\u7684\u65f6\u95f4\u3002\u4e00\u822c\u662f 1\/3 \u7684 Full Stroke \u65f6\u95f4\u3002<\/li>\n<li><strong>Track-to-Track:<\/strong> \u5728\u76f8\u90bb\u7684\u78c1\u9053\u4e4b\u95f4\u79fb\u52a8\u78c1\u5934\u6240\u9700\u8981\u7684\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<p>\u73b0\u5728\u7684\u673a\u68b0\u786c\u76d8 Average \u65f6\u95f4\u4e00\u822c\u5728 3~15ms \u5de6\u53f3\u3002<\/p>\n<h3>\u65cb\u8f6c\u5ef6\u8fdf(Rotational Latency)<\/h3>\n<p>\u5728\u5c06\u78c1\u5934\u79fb\u52a8\u5230\u6307\u5b9a\u78c1\u9053\u540e\uff0c\u8fd8\u9700\u8981\u8f6c\u52a8\u78c1\u76d8\u76d8\u7247\uff0c\u5c06\u78c1\u5934\u6307\u5230\u7279\u5b9a\u7684\u6247\u533a\u4ee5\u4f9b\u8bfb\u5199\u3002\u8fd9\u4e2a\u65f6\u95f4\u4e3a Rotational Latency\uff0c\u548c\u786c\u76d8\u7684\u8f6c\u901f\u7d27\u5bc6\u76f8\u5173\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0cAverage Rotational Latency \u4e3a Full Rotational Latency \u7684\u4e00\u534a\u3002<\/p>\n<p>\u4ee5 5400 rpm \u8f6c\u901f\u7684\u786c\u76d8\u4e3a\u4f8b\uff0c\u6bcf\u5206\u949f\u8f6c\u52a8 5400 \u8f6c\uff0c\u5373 Full Rotational Latency \u4e3a 60*1000\/5400 = 11.11ms\u3002\u90a3\u4e48 Average Rotational Latency \u5c31\u662f 5.5 ms \u5de6\u53f3\u3002<\/p>\n<h3>\u6570\u636e\u4f20\u8f93\u901f\u7387(Data Transfer Rate)<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2022\/02\/image-20220211001141721.png\" alt=\"image-20220211001141721\" \/><\/p>\n<p>\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u673a\u68b0\u786c\u76d8\u7684\u6570\u636e\u4f20\u8f93\u901f\u7387\u6709\u4e24\u4e2a\u68c0\u6d4b\u70b9\uff1a<\/p>\n<ul>\n<li>\u5916\u90e8\u6570\u636e\u4f20\u8f93\u901f\u7387(External transfer rate): \u8fd9\u4e2a\u662f\u4ece\u786c\u76d8\u5916\u5199\u5165\u5230\u786c\u76d8\u5185 Buffer \u533a\u57df\u7684\u901f\u5ea6\u3002<\/li>\n<li>\u5185\u90e8\u6570\u636e\u4f20\u8f93\u901f\u7387(Internal transfer rate): \u8fd9\u4e2a\u662f\u4ece\u786c\u76d8\u5185 Buffer \u901a\u8fc7\u78c1\u5934\u5199\u5165\u5230\u76d8\u7247\u4e2d\u7684\u901f\u5ea6\u3002<\/li>\n<\/ul>\n<p>\u4e00\u822c\u6765\u8bf4\uff0cExternal transfer rate \u90fd\u8981\u8fdc\u5927\u4e8e Internal transfer rate\u3002<\/p>\n<h2>IOPS<\/h2>\n<p>\u4ece\u4e0a\u9762\u603b\u7ed3\u5230\u7684\u4e09\u4e2a\u7ef4\u5ea6\uff0c\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\uff0c\u4e00\u6b21 I\/O \u7684\u65f6\u95f4\u4e3a\uff1a<\/p>\n<p>T(s) = T + L + X<\/p>\n<p>\u5176\u4e2d\uff0cT \u4e3a\u5e73\u5747\u7684\u5bfb\u9053\u65f6\u95f4\uff0cL \u4e3a\u5e73\u5747\u65cb\u8f6c\u5ef6\u8fdf\uff0cX \u4e3a\u6570\u636e\u4f20\u8f93\u65f6\u95f4\u3002\u5bf9\u4e8e\u4e00\u5757 7200rpm\uff0c\u5e73\u5747\u5bfb\u9053\u65f6\u95f4\u4e3a 5ms\uff0c\u5185\u90e8\u6570\u636e\u4f20\u8f93\u901f\u7387\u4e3a 40MB\/s \u7684\u673a\u68b0\u786c\u76d8\u6765\u8bf4\u3002\u6bcf\u6b21\u5927\u5c0f\u4e3a 32KB \u7684 I\/O \u9700\u8981\u7684\u65f6\u95f4\u4e3a\uff1a<\/p>\n<p>T(s) = 5ms + (60*1000ms\/7200)\/2 + 32KB\/40MB&#42;1000ms = 5ms + 4.17ms + 0.78ms = 9.95 ms<\/p>\n<p>IOPS \u63cf\u8ff0\u7684\u662f\u6bcf\u79d2\u7684 I\/O \u6b21\u6570\uff0c\u90a3\u4e48\u53ef\u4ee5\u5f97\u51fa\u8be5\u786c\u76d8\u7684 IOPS \u4e3a\uff1a1000\/9.95 = 100.5 IOPS\u3002<\/p>\n<h2>\u786c\u76d8 I\/O \u63a7\u5236\u5668\u7684\u5229\u7528\u7387<\/h2>\n<p>\u9664\u4e86\u4e0a\u8ff0\u786c\u76d8\u672c\u8eab\u7684\u6027\u80fd\u53c2\u6570\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4ece\u5b9e\u9645\u4f7f\u7528\u65f6\u78c1\u76d8 I\/O \u63a7\u5236\u5668\u7684\u5229\u7528\u7387\u6765\u8bc4\u4f30\u3002\u6211\u4eec\u53ef\u4ee5\u5c06\u786c\u76d8\u5f53\u4f5c\u9ed1\u76d2\uff0c\u53ea\u6709\u4ee5\u4e0b\u4e24\u4e2a\u7ec4\u4ef6\u6784\u6210\uff1a<\/p>\n<ul>\n<li>\u961f\u5217\uff1a\u5728 I\/O \u8bf7\u6c42\u88ab\u5904\u7406\u4e4b\u524d\uff0c\u90fd\u88ab\u5b58\u653e\u5728\u961f\u5217\u4e2d\u7b49\u5f85\u3002<\/li>\n<li>\u786c\u76d8 I\/O \u63a7\u5236\u5668\uff1a\u63a7\u5236\u5668\u8d1f\u8d23\u4ece\u961f\u5217\u4e2d\u53d6\u51fa I\/O \u8bf7\u6c42\u5e76\u5904\u7406\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2022\/02\/screenshot-20220211-220424.png\" alt=\"disk-io-rate\" \/><\/p>\n<p>\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u5e94\u7528\u4ea7\u751f\u7684 I\/O \u8bf7\u6c42\u5148\u5230\u8fbe I\/O \u961f\u5217\u4e2d\uff0c\u7531 I\/O \u63a7\u5236\u5668\u53d6\u51fa\u5e76\u5904\u7406\u3002\u5982\u679c\u8be5\u961f\u5217\u7684\u957f\u5ea6\u6301\u7eed\u589e\u52a0\uff0c\u90a3\u4e48\u6bcf\u4e2a I\/O \u7684\u5e73\u5747\u54cd\u5e94\u65f6\u95f4\u4e5f\u662f\u6301\u7eed\u589e\u52a0\u7684\u3002\u53ef\u4ee5\u5f97\u51fa\uff1a<\/p>\n<p>\u5e73\u5747\u54cd\u5e94\u65f6\u95f4 = T(s)\/(1-\u5229\u7528\u7387)\u3002<\/p>\n<p>\u6839\u636e\u8be5\u516c\u5f0f\u53ef\u4ee5\u5f97\u51fa\u4e0b\u56fe\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2022\/02\/screenshot-20220211-221211.png\" alt=\"graph\" \/><\/p>\n<p>\u5e73\u5747\u54cd\u5e94\u65f6\u95f4\u7684\u589e\u957f\u5e76\u4e0d\u662f\u7ebf\u6027\u7684\uff0c\u5f53\u5229\u7528\u7387\u8d8a\u9ad8\uff0c\u589e\u957f\u4f1a\u8d8a\u5feb\u3002\u6574\u4e2a\u589e\u957f\u7684\u62d0\u70b9\u5927\u6982\u5728 70% \u5904\u3002\u6240\u4ee5\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u8981\u4fdd\u8bc1\u6211\u4eec\u7684\u5e94\u7528\u4f7f\u7528\u7684\u78c1\u76d8\u5229\u7528\u7387\u5728 70% \u5de6\u53f3\uff0c\u624d\u80fd\u4fdd\u8bc1\u4e00\u4e2a\u8f83\u597d\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8ff0 \u4ece\u4e2a\u4eba PC \u5230\u6570\u636e\u4e2d\u5fc3\uff0c\u673a\u68b0\u786c\u76d8\u90fd\u626e\u6f14\u7740\u4e0d\u53ef\u6216\u7f3a\u7684\u89d2\u8272\u3002\u4ece\u6027\u80fd\u3001\u5b58\u50a8\u5bb9\u91cf\u7b49\u65b9\u9762\u6765\u8003\u8651\uff0c\u673a\u68b0\u786c\u76d8\u4e00\u76f4\u90fd\u662f &hellip; <a href=\"https:\/\/www.myway5.com\/index.php\/2022\/02\/11\/hdd-performance\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u673a\u68b0\u786c\u76d8\u7684\u6027\u80fd\u8bc4\u4f30<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[123],"tags":[],"class_list":["post-1072","post","type-post","status-publish","format-standard","hentry","category-storage"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u673a\u68b0\u786c\u76d8\u7684\u6027\u80fd\u8bc4\u4f30 - \u4e00\u53ea\u5b89\u9759\u7684\u732b<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.myway5.com\/index.php\/2022\/02\/11\/hdd-performance\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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