{"id":1917,"date":"2017-03-15T22:42:38","date_gmt":"2017-03-15T14:42:38","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=1917"},"modified":"2017-03-15T22:42:38","modified_gmt":"2017-03-15T14:42:38","slug":"dd%e5%91%bd%e4%bb%a4%e7%a3%81%e7%9b%98%e5%af%b9%e6%8b%b7%e5%8f%8a%e5%a4%87%e4%bb%bd","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/jishu\/dd%e5%91%bd%e4%bb%a4%e7%a3%81%e7%9b%98%e5%af%b9%e6%8b%b7%e5%8f%8a%e5%a4%87%e4%bb%bd\/","title":{"rendered":"dd\u547d\u4ee4\u78c1\u76d8\u5bf9\u62f7\u53ca\u5907\u4efd"},"content":{"rendered":"

dd\u547d\u4ee4\uff1aconvert and copy a file<\/p>\n

\u7528\u6cd5\uff1a<\/strong><\/p>\n

dd if=\/PATH\/FROM\/SRC of=\/PATH\/TO\/DEST<\/p>\n

bs=#\uff1ablock size, \u590d\u5236\u5355\u5143\u5927\u5c0f\uff1b<\/p>\n

count=#\uff1a\u590d\u5236\u591a\u5c11\u4e2abs\uff1b<\/p>\n

\u78c1\u76d8\u62f7\u8d1d\uff1a<\/strong><\/p>\n

dd if=\/dev\/sda of=\/dev\/sdb<\/p>\n

\u5907\u4efdMBR<\/strong><\/p>\n

dd if=\/dev\/sda of=\/tmp\/mbr.bak bs=512 count=1<\/p>\n

\u7834\u574fMBR\u4e2d\u7684bootloader\uff1a<\/strong><\/p>\n

dd if=\/dev\/zero of=\/dev\/sda bs=256 count=1<\/p>\n

\u4e24\u4e2a\u7279\u6b8a\u8bbe\u5907\uff1a<\/p>\n

\/dev\/null: \u6570\u636e\u9ed1\u6d1e\uff1b<\/p>\n

\/dev\/zero\uff1a\u5410\u96f6<\/p>\n

1.\u505a\u786c\u76d8\u5bf9\u62f7\uff1a<\/strong><\/p>\n

dd if=\/dev\/sda of=\/dev\/sdb bs=1024k &<\/p>\n

\u6ce8\u610f\uff1a<\/p>\n

(1).\u5148\u6539fstab\u6587\u4ef6\uff0c\u628aLABLE\u6362\u6210\u5bf9\u5e94\u7684\u00a0 \/dev\/sda(\u4e0d\u6539\u7684\u8bdd\uff0c\u62f7\u5b8c\u540e\u91cd\u542f\u7cfb\u7edf\u4e0d\u77e5\u9053\u4ece\u54ea\u5757\u76d8\u542f\u52a8\u4e86\uff09<\/p>\n

\/dev\/sda2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ext3\u00a0 \u00a0 defaults\u00a0 \u00a0 \u00a0 \u00a0 1 1<\/p>\n

\/dev\/sda5\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/data\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ext3\u00a0 \u00a0 defaults\u00a0 \u00a0 \u00a0 \u00a0 1 2<\/p>\n

\/dev\/sda1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/boot\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ext3\u00a0 \u00a0 defaults\u00a0 \u00a0 \u00a0 \u00a0 1 2<\/p>\n

(2).\u4e00\u5b9a\u8981\u5199bs=1024k\uff0c\u4e00\u5b9a\u8981\u52a0k, \u9ed8\u8ba4\u662fbytes,\u4e0d\u52a0K\u6216M,\u662f\u4ee5bytes\u5199\u5165\uff0c<\/p>\n

\u6709\u53ef\u80fd\u7cfb\u7edf\u8981\u6302\u4e86,\u81f3\u4e8e \u4e5f\u6709\u4eba\u5199bs=4M,\u6ca1\u5565\u533a\u522b\uff0c\u6700\u540e\u901f\u5ea6\u5dee\u4e0d\u591a\u3002<\/p>\n

(3).\u52a0 & \u540e\u53f0\u8fdb\u884c,\u56e0\u4e3a\u8981\u7528\u5f53\u524d\u7684\u7ec8\u7aef\u6765\u67e5\u770bdd\u8fdb\u5ea6,\u5982\u679c\u5fd8\u4e86\u52a0 &,\u53ef\u4ee5\u7528Ctrl+z<\/p>\n

\u628add\u8fdb\u7a0b\u79fb\u5230\u540e\u53f0\uff0c\u518d\u8fd0\u884c bg \u8bb0\u5176\u540e\u53f0\u8fd0\u884c(\u4e3a\u4e86\u5728\u5f53\u524d\u7ec8\u7aef\u67e5\u770b\u8fdb\u5ea6\uff09\u3002<\/p>\n

2.\u67e5\u770bdd\u5b8c\u6210\u8fdb\u5ea6\uff0c\u8981\u4e0d\u7136\u9b3c\u77e5\u9053\u5565\u65f6\u5019\u80fddd\u5b8c\u6210\u554a<\/strong><\/p>\n

ps -ef|grep dd\u00a0 \/\/\u67e5\u770b dd \u8fdb\u7a0bid\u53f7,\u5176\u5b9e\u4e0a\u8fb9\u547d\u4ee4\u52a0&\u540e\uff0c\u5df1\u7ecf\u663e\u793a\u4e86\u3002<\/p>\n

kill -USR1\u00a0 id\u00a0 \/\/\u67e5\u770b dd \u5b8c\u6210\u8fdb\u5ea6<\/p>\n

100118036480 bytes (100 GB) copied, 1346.94 seconds, 74.3 MB\/s<\/p>\n

\u5982\u679c\u60f3\u65f6\u65f6\u67e5\u770b\u8fdb\u5ea6\uff0c\u53ef\u4ee5\u7528\u4e0b\u9762\u8bed\u53e5:<\/p>\n

watch -n 1 kill -USR1 3730\u00a0 \/\/ \u6bcf2\u79d2\u67e5\u770b\u4e00\u6b21\u8fdb\u5ea6<\/p>\n

while kill -USR1 3730;do sleep 2;done;\u00a0 \/\/\u6bcf2\u79d2\u67e5\u770b\u4e00\u6b21\u8fdb\u5ea6<\/p>\n

\u8fd9\u79cd\u662f\u901a\u8fc7\u53d1\u9001USR1\u4fe1\u53f7\u7684\u65b9\u6cd5\uff0c\u53bb\u4ea7\u751f\u4e00\u4e2a\u6807\u51c6\u7684IO\u9519\u8bef\uff0c\u6765\u8fbe\u5230\u663e\u793a\u5f53\u524dCOPY\u8fdb\u5ea6\u4e0eCOPY\u901f\u5ea6\u7684\u76ee\u7684\u3002<\/p>\n

3.\u5982\u679csdb\u539f\u6765\u662f\u4e00\u4e2a\u88f8\u76d8\u6ca1\u6709\u683c\u5f0f\u5316\u8fc7\uff0cdd\u53ef\u80fd\u5e76\u4e0d\u80fd\u62f7\u8d1dsuperblock\u4fe1\u606f\uff0c\u6240\u4ee5\u76d8\u4e0d\u80fdmount\u8d77\u6765\u3002<\/strong><\/p>\n

\u6240\u4ee5\u53ea\u9700\u8981\u8fdb\u5165fdisk\u754c\u9762\uff1a<\/p>\n

# fdisk \/dev\/sdb<\/p>\n

# w<\/p>\n

\u201cwrite table to disk and exit\u201d\uff0csdb\u5c31\u53ef\u4ee5mount\u8d77\u6765\u4e86\uff0c\u5982\u679c\u662f\u683c\u8fc7\u7684\uff0c\u53ef\u80fd\u9700\u8981fsck\u4e00\u4e0b\u5c31\u53ef\u4ee5\u4e86<\/p>\n

\u6ce8\u610f\uff1a\u5efa\u8bae\u4e0d\u8981\u8f7b\u6613dd\uff0c\u6709\u53ef\u80fd\u628a\u7cfb\u7edf\u641e\u574f,\u5728\u6709\u628a\u63e1\u60c5\u51b5\u4e0b\u6216\u6570\u636e\u5907\u4efd\u8fc7\u60c5\u51b5\u4e0b\u4f7f\u7528dd<\/p>\n

\u672c\u6587\u6c38\u4e45\u66f4\u65b0\u94fe\u63a5\u5730\u5740<\/strong>\uff1ahttps:\/\/www.linuxidc.com\/Linux\/2017-03\/141749.htm<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

dd\u547d\u4ee4\uff1aconvert and copy a file \u7528\u6cd5\uff1a dd if=\/PATH\/FROM\/SRC o … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[49,5],"tags":[401,38],"class_list":["post-1917","post","type-post","status-publish","format-standard","hentry","category-linux","category-jishu","tag-dd","tag-linux"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/1917","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/comments?post=1917"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/1917\/revisions"}],"predecessor-version":[{"id":1918,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/1917\/revisions\/1918"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/media?parent=1917"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/categories?post=1917"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/tags?post=1917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}