{"id":85861,"date":"2018-10-16T07:35:11","date_gmt":"2018-10-16T14:35:11","guid":{"rendered":"https:\/\/www.backblaze.com\/blog\/?p=85861"},"modified":"2021-07-23T12:46:55","modified_gmt":"2021-07-23T19:46:55","slug":"2018-hard-drive-failure-rates","status":"publish","type":"post","link":"https:\/\/www.backblaze.com\/blog\/2018-hard-drive-failure-rates\/","title":{"rendered":"Hard Drive Stats for Q3 2018: Less is More"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-85863 size-full\" title=\"2018 Hard Drive Reliability Review\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2018\/10\/hard-drive-stats-q3-2018.jpg\" alt=\"Backblaze Drive Stats Q3 2018\" width=\"1522\" height=\"820\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/hard-drive-stats-q3-2018.jpg 1522w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/hard-drive-stats-q3-2018-300x162.jpg 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/hard-drive-stats-q3-2018-1024x552.jpg 1024w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/hard-drive-stats-q3-2018-768x414.jpg 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/hard-drive-stats-q3-2018-560x302.jpg 560w\" sizes=\"auto, (max-width: 1522px) 100vw, 1522px\" \/><\/p>\n<p>As of September 30, 2018 Backblaze had 99,636 spinning hard drives. Of that number, there were 1,866 boot drives and 97,770 data drives. This review looks at the quarterly and lifetime statistics for the data drive models in operation in our data centers. In addition, we\u2019ll say goodbye to the last of our 3TB drives, hello to our new 12TB HGST drives, and we\u2019ll explain how we have 584 fewer drives than last quarter, but have added over 40 <a href=\"\/blog\/petabytes-on-a-budget-10-years-and-counting\/\">petabytes<\/a> of storage. Along the way, we\u2019ll share observations and insights on the data presented and we look forward to you doing the same in the comments.<\/p>\n<h2 class=\"b2\">Hard Drive Reliability Statistics for Q3 2018<\/h2>\n<p>At the end of Q3 2018, Backblaze was monitoring 97,770 hard drives used to store data. For our evaluation, we remove from consideration those drives that were used for testing purposes and those drive models for which we did not have at least 45 drives (see why below). This leaves us with 97,600 hard drives. The table below covers what happened in Q3 2018.<\/p>\n<p><a href=\"\/blog\/wp-content\/uploads\/2018\/10\/blog-Q3-2018-quarterly-chart.png\" target=\"_blank\" rel=\"noopener noreferrer\" data-rel=\"lightbox-gallery-0KQLGPji\" data-rl_title=\"\" data-rl_caption=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-85866 size-full\" title=\"\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2018\/10\/blog-Q3-2018-quarterly-chart.png\" alt=\"Backblaze Q3 2018 Hard Drive Failure Rates chart\" width=\"782\" height=\"672\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/blog-Q3-2018-quarterly-chart.png 782w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/blog-Q3-2018-quarterly-chart-300x258.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/blog-Q3-2018-quarterly-chart-768x660.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/blog-Q3-2018-quarterly-chart-560x481.png 560w\" sizes=\"auto, (max-width: 782px) 100vw, 782px\" \/><\/a><\/p>\n<p><b>Notes and Observations<\/b><\/p>\n<ul>\n<li>If a drive model has a failure rate of 0%, it only means there were no drive failures of that model during Q3 2018.<\/li>\n<li>Quarterly failure rates can be volatile, especially for models that have a small number of drives and\/or a small number of <em>Drive Days<\/em>.<\/li>\n<li>There were 170 drives (97,770 minus 97,600) that were not included in the list above because we did not have at least 45 of a given drive model. We use 45 drives of the same model as the minimum number when we report quarterly, yearly, and lifetime<a href=\"\/blog\/backblaze-hard-drive-stats-for-2020\/\"> drive statistics<\/a>.<\/li>\n<\/ul>\n<h2 class=\"b2\">When to Replace a Hard Drive<\/h2>\n<p>As noted, at the end of Q3 that we had 584 fewer drives, but over 40 petabytes more storage space. We replaced 3TB, 4TB, and even a handful of 6TB drives with 3,600 new 12TB drives using the very same data center infrastructure, i.e. <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/resources\/storage-pod\" target=\"_blank\" rel=\"noopener noreferrer\">racks of Storage Pods<\/a>. The drives we are replacing are about 4 years old. That\u2019s plus or minus a few months depending on how much we paid for the drive and a number of other factors. Keeping lower density drives in service when higher density drives are both available and efficiently priced does not make economic sense.<\/p>\n<h3 class=\"b3\">Why Drive Migration Will Continue<\/h3>\n<p>Over the next several years, data growth is expected to explode. Hard drives are still expected to store the bulk of that data, meaning <a href=\"https:\/\/www.backblaze.com\/cloud-storage\">cloud storage<\/a> companies like Backblaze will have to increase capacity by either increasing existing<a href=\"\/blog\/hamr-hard-drives\/\"> storage densit<\/a>y and\/or building, or building out, more data centers. Drive manufacturers, like Seagate and Western Digital, are looking at HDD storage densities of 40TB as early as 2023, just 5 years away. It is significantly less expensive to replace lower density operational drives in a data center versus building a new facility or even building out an existing facility to house the higher density drives.<\/p>\n<h3 class=\"b3\">Goodbye 3TB WD Drives<\/h3>\n<p>For the last couple of quarters, we had 180 Western Digital 3TB drives (model: WD30EFRX) remaining &#8212; the last of our 3TB drives. In early Q3, they were removed and replaced with 12TB drives. These 3TB drives were purchased in the aftermath of the <a href=\"\/blog\/backblaze_drive_farming\/\" target=\"_blank\" rel=\"noopener noreferrer\">Thailand drive crisis<\/a> and installed in mid-2014 and were still hard at work when we replaced them. Sometime over the next couple of years we expect to say goodbye to all of our 4TB drives and upgrade them to 14, 16, or even 20TB drives. After that it will be time to \u201cup-density\u201d our 6TB systems, then our 8TB systems, and so on.<\/p>\n<h3 class=\"b3\">Hello 12TB HGST Drives<\/h3>\n<p>In Q3 we added 79 HGST 12TB drives (model: HUH721212ALN604) to the farm. While 79 may seem like an unusual number of drives to add, it represents \u201cstage 2\u201d of our drive testing process. Stage 1 uses 20 drives, the number of hard drives in one <a href=\"\/blog\/vault-cloud-storage-architecture\/\" target=\"_blank\" rel=\"noopener noreferrer\">Backblaze Vault<\/a> tome. That is, there are are 20 Storage Pods in a Backblaze Vault, and there is one \u201ctest\u201d drive in each Storage Pod. This allows us to compare the performance, etc., of the test tome to the remaining 59 production tomes (which are running already-qualified drives). There are 60 tomes in each Backblaze Vault. In stage 2, we fill an entire Storage Pod with the test drives, adding 59 test drives to the one currently being tested in one of the 20 Storage Pods in a Backblaze Vault.<\/p>\n<p>To date, none of the 79 HGST drives have failed, but as of September 30th, they were installed only 9 days. Let\u2019s see how they perform over the next few months.<\/p>\n<h3 class=\"b3\">A New Drive Count Leader<\/h3>\n<p>For the last 4 years, the drive model we\u2019ve deployed the most has been the 4TB Seagate drive, model ST4000DM000. In Q3 we had 24,208 of this drive model, which is now only good enough for second place. The 12TB Seagate drive, model ST12000NM0007, became our new drive count leader with 25,101 drives in Q3.<\/p>\n<h2 class=\"b2\">Lifetime <a href=\"\/blog\/best-hard-drive-q4-2014\/\">Hard Drive Reliability<\/a> Statistics<\/h2>\n<p>While the quarterly chart presented earlier gets a lot of interest, the real test of any drive model is over time. Below is the lifetime failure rate chart for all the hard drive models in operation as of September 30th, 2018. For each model, we <a href=\"https:\/\/www.backblaze.com\/b2\/solutions\/compute.html\">compute<\/a> their reliability starting from when they were first installed.<\/p>\n<p><a href=\"\/blog\/wp-content\/uploads\/2018\/10\/Q3-2018-Lifetime-Chart-2.png\" data-rel=\"lightbox-gallery-0KQLGPji\" data-rl_title=\"\" data-rl_caption=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-85862 size-full\" title=\"\" src=\"https:\/\/www.backblaze.com\/blog\/wp-content\/uploads\/2018\/10\/Q3-2018-Lifetime-Chart-2.png\" alt=\"Backblaze Lifetime Hard Drive Failure Rates Chart\" width=\"911\" height=\"641\" srcset=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/Q3-2018-Lifetime-Chart-2.png 911w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/Q3-2018-Lifetime-Chart-2-300x211.png 300w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/Q3-2018-Lifetime-Chart-2-768x540.png 768w, https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/Q3-2018-Lifetime-Chart-2-560x394.png 560w\" sizes=\"auto, (max-width: 911px) 100vw, 911px\" \/><\/a><\/p>\n<p><b>Notes and Observations<\/b><\/p>\n<ul>\n<li>The failure rates of all of the larger drives (8, 10, and 12 TB) are very good: 1.21% AFR (Annualized Failure Rate) or less. In particular, the Seagate 10TB drives, which have been in operation for over 1 year now, are performing very nicely with a failure rate of 0.48%.<\/li>\n<li>The overall failure rate of 1.71% is the lowest we have ever achieved, besting the previous low of 1.82% from <a href=\"\/blog\/hard-drive-stats-for-q2-2018\/\" target=\"_blank\" rel=\"noopener noreferrer\">Q2 of 2018<\/a>.<\/li>\n<\/ul>\n<h3 class=\"b3\">The <a href=\"\/blog\/backblaze-hard-drive-stats-q3-2019\/\">Hard Drive Stats<\/a> Data<\/h3>\n<p>The complete data set used to create the information used in this review is available on our <a href=\"https:\/\/www.backblaze.com\/cloud-storage\/resources\/hard-drive-test-data\" target=\"_blank\" rel=\"noopener noreferrer\">Hard Drive Test Data page<\/a>. You can download and use this data for free for your own purpose. All we ask are three things: 1) you cite <a href=\"https:\/\/www.backblaze.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Backblaze<\/a> as the source if you use the data, 2) you accept that you are solely responsible for how you use the data, and 3) you do not sell this data to anyone. It is free.<\/p>\n<p>If you just want the summarized data used to create the tables and charts in this blog post you can <a href=\"https:\/\/f001.backblazeb2.com\/file\/Backblaze_Blog\/Q3_2018_Drive_Stats_Chart_Data.zip\" target=\"_blank\" rel=\"noopener noreferrer\">download the ZIP file<\/a> containing the MS Excel spreadsheet.<\/p>\n<p>Good luck and let us know if you find anything interesting.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>As of September 30, 2018 Backblaze had 99,636 spinning hard drives in our data centers, which now includes a large number of 12 TB drives. Here&#8217;s our latest report on how they&#8217;re all doing, and a brief look at the direction we&#8217;ll be heading in the future.<\/p>\n","protected":false},"author":12,"featured_media":85863,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[7,457],"tags":[468],"class_list":["post-85861","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud-storage","category-hard-drive-stats","tag-b2cloud","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Backblaze Drive Stats: 2018 Hard Drive Failure Rates<\/title>\n<meta name=\"description\" content=\"Backblaze has 99,636 spinning hard drives. This review looks at the quarterly and lifetime statistics for the data drive models in operation in our data centers.\" \/>\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.backblaze.com\/blog\/2018-hard-drive-failure-rates\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Backblaze Drive Stats: 2018 Hard Drive Failure Rates\" \/>\n<meta property=\"og:description\" content=\"Backblaze has 99,636 spinning hard drives. This review looks at the quarterly and lifetime statistics for the data drive models in operation in our data centers.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/backblazeprod.wpenginepowered.com\/blog\/2018-hard-drive-failure-rates\/\" \/>\n<meta property=\"og:site_name\" content=\"Backblaze Blog | Cloud Storage &amp; Cloud Backup\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/backblaze\" \/>\n<meta property=\"article:published_time\" content=\"2018-10-16T14:35:11+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-07-23T19:46:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/hard-drive-stats-q3-2018.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1522\" \/>\n\t<meta property=\"og:image:height\" content=\"820\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Andy Klein\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@backblaze\" \/>\n<meta name=\"twitter:site\" content=\"@backblaze\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Andy Klein\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Backblaze Drive Stats: 2018 Hard Drive Failure Rates","description":"Backblaze has 99,636 spinning hard drives. 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He currently writes and rants about drive stats, Storage Pods, cloud storage, and more.","url":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/author\/andy\/"}]}},"jetpack_featured_media_url":"https:\/\/backblazeprod.wpenginepowered.com\/wp-content\/uploads\/2018\/10\/hard-drive-stats-q3-2018.jpg","_links":{"self":[{"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/posts\/85861","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/comments?post=85861"}],"version-history":[{"count":0,"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/posts\/85861\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/media\/85863"}],"wp:attachment":[{"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/media?parent=85861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/categories?post=85861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/backblazeprod.wpenginepowered.com\/blog\/wp-json\/wp\/v2\/tags?post=85861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}