{"id":2029,"date":"2019-01-18T17:54:09","date_gmt":"2019-01-18T17:54:09","guid":{"rendered":"http:\/\/elbsolutions.com\/projects\/?p=2029"},"modified":"2022-02-03T11:24:27","modified_gmt":"2022-02-03T17:24:27","slug":"raid-references-that-i-find-useful","status":"publish","type":"post","link":"https:\/\/elbsolutions.com\/projects\/raid-references-that-i-find-useful\/","title":{"rendered":"RAID references that I find useful"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">I am keeping it simple &#8211; this is reference that helps me explain things for myself and for my customers. Situation: why do I need RAID 5 when we have 2 NAS&#8217;s &#8211; it already has redundancy\/backup. RAID 5 is not being used for redundancy &#8211; it is used to lower the overall cost of a system you know <u>WILL<\/u> fail 1 day (these hard drive are quite hot and are mechanical devices)<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"http:\/\/www.raid-calculator.com\/default.aspx\">Raid Calculator<\/a><\/li><li><a href=\"http:\/\/www.raid-calculator.com\/raid-types-reference.aspx\">Types of RAID explained<\/a><a href=\"https:\/\/www.makeuseof.com\/tag\/most-reliable-hard-drives\/\"><br><\/a><\/li><\/ul>\n\n\n\n<!--more-->\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.makeuseof.com\/tag\/most-reliable-hard-drives\/\">Best Types of Server Drives (results over the past year &#8211; Jan 2018-2019<\/a>)<ul><li> so if a 25% loss of drive space is created by RAID 5 &#8211; buy a drive 25% larger &#8211; so eg. 10TBx4 = 30TB (assuming RAID 5) &#8211; simply buy 14TBx4 drives which makes makes it a 30TB drive, buy 14TBx4 = 42TB (assuming RAID 5).<\/li><li>well that is a stupid and obvious argument! (you might say) &#8230; well until $$ is considered. The diff in price between 4x10TB and 4x14TB server class drives is $70&#215;4 = $240. <ul><li>if a drive fails &#8211; you ideally should be able to pop in another one and the system should rebuild it self (I have been through this with 4 failed drives over 1 month with RAID 10 (double RAID5-ish) and it is the coolest thing to see work!<\/li><li>An assumption in this argument was that there were 2 mirrored NAS&#8217;s &#8211; providing the redundancy<\/li><li>How long $$-wise would it take your IT guy to rebuild a new unit. If it is cheaper than the larger drives &#8211; don&#8217;t use RAID. Note that that was a facetious comment. It would take at least 6 hours to get everything back up and mirrored from the NAS in another location.<\/li><li>So RAID 5 in this case has NOTHING to do with data redundancy but everything to do with &#8220;how fast can I get a broken hard drive up and running on the NAS&#8221; AND how much down time I will NOT be spending on hardware fixing (same reason people buy Toyota\/Honda&#8217;s)<\/li><li>RAID 5 should also allow 1 drive to fail and the NAS still would be working.<\/li><\/ul><\/li><\/ul><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Does higher temp decrease the life!? <a href=\"https:\/\/www.electronics-cooling.com\/2017\/08\/10c-increase-temperature-really-reduce-life-electronics-half\/#\">Yes it does &#8211; the theory hasn&#8217;t changed<\/a> since my days at <a href=\"https:\/\/uwaterloo.ca\/\">the Uni<\/a>. But &#8230; it is all in context. If the drive manufacturer did a good job and cooling is adequate then &#8230; lets see some empiric evidence (note the WD has the longest lasting drives). <a href=\"https:\/\/www.backblaze.com\/blog\/hard-drive-temperature-does-it-matter\/\">This guy totally disagrees with the theory (I am arguing that)<\/a>&#8211; BUT &#8230; the manufacturers and the environment the drives are in are likely well built &#8211; so it is a whole system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"http:\/\/knowledge.seagate.com\/articles\/en_US\/FAQ\/174791en\">AFK vs. MTBF\u00a0Use\u00a0AFK\u00a0for\u00a0hard\u00a0drives\u00a0is\u00a0a\u00a0suggesto<\/a>in by Seagate.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I am keeping it simple &#8211; this is reference that helps me explain things for myself and for my customers. Situation: why do I need RAID 5 when we have 2 NAS&#8217;s &#8211; it already has redundancy\/backup. RAID 5 is not being used for redundancy &#8211; it is used to lower the overall cost of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2029","post","type-post","status-publish","format-standard","hentry","category-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RAID references that I find useful - ELB Solutions.com Inc.<\/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:\/\/elbsolutions.com\/projects\/raid-references-that-i-find-useful\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RAID references that I find useful - ELB Solutions.com Inc.\" \/>\n<meta property=\"og:description\" content=\"I am keeping it simple &#8211; this is reference that helps me explain things for myself and for my customers. Situation: why do I need RAID 5 when we have 2 NAS&#8217;s &#8211; it already has redundancy\/backup. 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