{"id":100,"date":"2006-01-08T11:33:00","date_gmt":"2006-01-08T11:33:00","guid":{"rendered":"http:\/\/adam.rosi-kessel.org\/weblog\/this_weblog\/raid_followup.html"},"modified":"-0001-11-30T00:00:00","modified_gmt":"1970-01-01T05:00:00","slug":"raid_followup","status":"publish","type":"post","link":"https:\/\/adam.rosi-kessel.org\/weblog\/2006\/01\/08\/raid_followup","title":{"rendered":"RAID Followup"},"content":{"rendered":"<p> Following up on <a href=\"http:\/\/adam.rosi-kessel.org\/weblog\/this_weblog\/popularity_out_of_control.html\">yesterday&#8217;s post about my slow server<\/a>, I just discovered why the RAID reconstruction was going so slowly. When the disc in question was knocked offline, all of the hdparm settings (most notably DMA) were reset. A simple: <\/p>\n<p><pre> hdparm -c 1 -d 1 -u 1 \/dev\/hde <\/pre>\n<\/p>\n<p> Instantly quadrupled the speed of RAID reconstruction, and also sped up the whole server noticeably. <\/p>\n<p> So, tip for the future (and for Google searchers): if your RAID is reconstructing very slowly, be sure to check the hdparm settings for all of the member discs. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Following up on yesterday&#8217;s post about my slow server, I just discovered why the RAID reconstruction was going so slowly. When the disc in question was knocked offline, all of the hdparm settings (most notably DMA) were reset. A simple: hdparm -c 1 -d 1 -u 1 \/dev\/hde Instantly quadrupled the speed of RAID reconstruction, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[20],"tags":[],"_links":{"self":[{"href":"https:\/\/adam.rosi-kessel.org\/weblog\/wp-json\/wp\/v2\/posts\/100"}],"collection":[{"href":"https:\/\/adam.rosi-kessel.org\/weblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/adam.rosi-kessel.org\/weblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/adam.rosi-kessel.org\/weblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/adam.rosi-kessel.org\/weblog\/wp-json\/wp\/v2\/comments?post=100"}],"version-history":[{"count":0,"href":"https:\/\/adam.rosi-kessel.org\/weblog\/wp-json\/wp\/v2\/posts\/100\/revisions"}],"wp:attachment":[{"href":"https:\/\/adam.rosi-kessel.org\/weblog\/wp-json\/wp\/v2\/media?parent=100"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/adam.rosi-kessel.org\/weblog\/wp-json\/wp\/v2\/categories?post=100"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/adam.rosi-kessel.org\/weblog\/wp-json\/wp\/v2\/tags?post=100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}