{"id":202,"date":"2014-07-29T17:16:43","date_gmt":"2014-07-29T09:16:43","guid":{"rendered":"http:\/\/blog.cyszys.com\/?p=202"},"modified":"2014-09-03T17:57:43","modified_gmt":"2014-09-03T09:57:43","slug":"202","status":"publish","type":"post","link":"http:\/\/blog.cyszys.com\/?p=202","title":{"rendered":"Linux \u4e0b\u6269\u5c55swap"},"content":{"rendered":"<p>\u5e73\u65f6\u5b89\u88c5oracle\u7684\u65f6\u5019\u7ecf\u5e38\u6325\u53d1\u6b64\u6848swap\u4e0e\u5b9e\u9645\u5185\u5b58\u7684\u6bd4\u4f8b\u4e0d\u7b26\uff0c\u600e\u4e48\u529e\u5462\uff1f\n\u5b9e\u9645\u4e0a\u662f\u53ef\u4ee5\u5728\u73b0\u6709\u6587\u4ef6\u7cfb\u7edf\u4e0a\u6dfb\u52a0\u7684\uff0c\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<p>\u5728\u78c1\u76d8\u7a7a\u95f4\u5145\u8db3\u7684\u533a\u57dfdd\u4e00\u4e2a\u7a7a\u6587\u4ef6\uff0c'\u6587\u4ef6\u5927\u5c0f'='\u7406\u60f3swap'-'\u73b0\u6709swap'\uff0c\u4f8b\u5982\u7269\u7406\u5185\u5b58\u662f4G\uff0c\u7406\u60f3swap\u5219\u662f8G\uff0c\u73b0\u6709\u5185\u5b58\u4e3a2G\uff0c\u5219\u6211\u4eec\u9700\u8981dd\u521b\u5efa\u4e00\u4e2a6G\u7684\u6587\u4ef6\u6765\u63d0\u4f9b\u7ed9swap\u7528\u3002<\/p>\n<p>\u7b2c\u4e00\u6b65 dd\u4e00\u4e2a\u6587\u4ef6\uff1a\ndd if=\/dev\/zero of=\/mnt\/swap01 bs=4096 count=1572864<\/p>\n<p>\u8fd4\u56de\u60c5\u51b5\u4e3a\uff1a<\/p>\n<pre class=\"brush:other\">[root@test \/]# dd if=\/dev\/zero of=\/mnt\/swap01 bs=4k count=1572864\n1572864+0 records in\n1572864+0 records out\n6442450944 bytes transferred in 15.148896 secs (425275271 bytes\/sec)<\/pre>\n<p>\u547d\u4ee4\u89e3\u91ca\uff1aif=\/dev\/zero \u4e3a\u53c2\u7167\u8bbe\u5907\u6307\u5411\uff0c\u4e00\u822c\u90fd\u5199\u8fd9\u4e2azero\u8bbe\u5907\u5c31\u884c\u4e86\uff0cof=<\u521b\u5efa\u7684\u6587\u4ef6\u7684\u8def\u5f84>\uff0cbs=4096\u8868\u793ablock size\u4e3a4kB\uff0ccount=1572864\u8868\u793a\u8981\u521b\u5efa\u7684\u6587\u4ef6\u5927\u5c0f\u4e3a1572864\u4e2ablock size\uff0c\u4e5f\u5c31\u662f6GB\u5927\u5c0f\u7684\u6587\u4ef6<\/p>\n<p>\u597d\u7684\uff0c\u6587\u4ef6\u5df2\u7ecf\u521b\u5efa\u5b8c\u6bd5\uff0c\u6211\u4eec\u4fdd\u8bc1\u8fd9\u4e2a\u6587\u4ef6\u7684\u5c5e\u4e3b\u4f4droot\u5c31\u884c\u4e86\uff0c\u63a5\u4e0b\u6765\u5411OS\u52a0\u8f7d\u8fd9\u4e2aswap\u6587\u4ef6\u3002<\/p>\n<p>\u7b2c\u4e8c\u6b65 \u521b\u5efa\u4ea4\u6362\u7a7a\u95f4\uff1a<\/p>\n<pre class=\"brush:other\">[root@test \/]# mkswap \/mnt\/swap01\nSetting up swapspace version 1, size = 6291456 kB<\/pre>\n<p>\u6211\u4eec\u67e5\u770b\u73b0\u6709\u7684swap\u7a7a\u95f4\u5bb9\u91cf\uff1a<\/p>\n<pre class=\"brush:other\">[root@test \/]# free -m\n             total       used       free     shared    buffers     cached\nMem:          8192       1905       6093          0         58       1404\n-\/+ buffers\/cache:        442       1541\nSwap:         1983          0       1983<\/pre>\n<p>\u7b2c\u4e09\u90e8 \u542f\u52a8\u65b0\u589e\u52a0\u76846GB\u4ea4\u6362\u7a7a\u95f4\uff1a<\/p>\n<pre class=\"brush:other\">[root@test \/]# swapon \/mnt\/swap01<\/pre>\n<p>\u4f7f\u7528free\u547d\u4ee4\u786e\u8ba4\u65b0\u589e\u76846GB\u4ea4\u6362\u7a7a\u95f4\u5df2\u7ecf\u751f\u6548\uff1a<\/p>\n<pre class=\"brush:other\">[root@test \/]# free -m\n             total       used       free     shared    buffers     cached\nMem:          8192       1905       6093          0         58       1404\n-\/+ buffers\/cache:        442       1541\nSwap:         8192          0       8192<\/pre>\n<p>\u7b2c\u56db\u6b65\n\u4fee\u6539\/etc\/fstab\u6587\u4ef6\uff0c\u4f7f\u5f97\u65b0\u52a0\u76846G\u4ea4\u6362\u7a7a\u95f4\u5728\u7cfb\u7edf\u91cd\u65b0\u542f\u52a8\u540e\u81ea\u52a8\u751f\u6548\n\u5728\u6587\u4ef6\u6700\u540e\u52a0\u5165\uff1a<\/p>\n<pre class=\"brush:other\">\/mnt\/swap01     swap      swap defaults 0 0<\/pre>\n<p>ok \u5b8c\u6210\u4e86\uff01<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>\u5e73\u65f6\u5b89\u88c5oracle\u7684\u65f6\u5019\u7ecf\u5e38\u6325\u53d1\u6b64\u6848swap\u4e0e\u5b9e\u9645\u5185\u5b58\u7684\u6bd4\u4f8b\u4e0d\u7b26\uff0c\u600e\u4e48\u529e\u5462\uff1f \u5b9e\u9645\u4e0a\u662f\u53ef\u4ee5\u5728\u73b0\u6709\u6587\u4ef6\u7cfb\u7edf\u4e0a\u6dfb [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,70,12],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=\/wp\/v2\/posts\/202"}],"collection":[{"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=202"}],"version-history":[{"count":2,"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=\/wp\/v2\/posts\/202\/revisions"}],"predecessor-version":[{"id":209,"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=\/wp\/v2\/posts\/202\/revisions\/209"}],"wp:attachment":[{"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=202"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.cyszys.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}