{"id":632,"date":"2006-07-17T23:51:00","date_gmt":"2006-07-17T23:51:00","guid":{"rendered":"http:\/\/markwilson.me.uk\/blog\/2006\/07\/why-raid-alone-is-not-answer-for.htm"},"modified":"2007-03-09T11:54:58","modified_gmt":"2007-03-09T11:54:58","slug":"why-raid-alone-is-not-answer-for","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2006\/07\/why-raid-alone-is-not-answer-for.htm","title":{"rendered":"Why RAID alone is not the answer for backups"},"content":{"rendered":"<p><!--115445772474467343-->I recently came across Gina Trapani&#8217;s article on <a href=\"http:\/\/www.scribbling.net\/backup\">the importance of backing up<\/a> (the comments are worth a read too). I hear what she&#8217;s saying &#8211; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2004\/12\/more-problems-with-dell-latitude-d600.htm\">a couple of years ago I very nearly lost a lot of data when a hard disk died<\/a> and today I have far more important stuff on disk (like all of my recent photography &#8211; including irreplaceable pictures of my son &#8211; a digitised music collection and years&#8217; worth of accumulated information), all spread across nearly a terabyte of separate devices.<\/p>\n<p>As we place more and more emphasis on our digital lifestyle, the amount of data stored will continue to grow and that creates a problem, especially for home and small business users.<\/p>\n<p>Optical media degrades over time and since <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/05\/amazingly-excellent-customer-service.htm\">the hard disk I bought for backups<\/a> is now in daily use with <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/07\/apparently-my-digital-life-starts-here.htm\">my new Macintosh computer<\/a>, I need to implement a decent backup regime. As disk sizes increase, a single disk seems like putting all my eggs in one basket, but I also hear people talking about how <a href=\"http:\/\/en.wikipedia.org\/wiki\/Redundant_array_of_independent_disks\">RAID<\/a> is the answer.<\/p>\n<p>No it&#8217;s not.<\/p>\n<p>The most common RAID levels in use are 0 (striping), 1 (mirroring) and 5 (striped set with parity). <a href=\"http:\/\/en.wikipedia.org\/wiki\/Redundant_array_of_independent_disks#RAID_0\">RAID 0<\/a> does not provide any fault tolerance, <a href=\"http:\/\/en.wikipedia.org\/wiki\/Redundant_array_of_independent_disks#RAID_5\">RAID 5<\/a> needs at least 3 disks &#8211; too much for most home and home office setups &#8211; that leaves just <a href=\"http:\/\/en.wikipedia.org\/wiki\/Redundant_array_of_independent_disks#RAID_1\">RAID 1<\/a>. Mirrors sometimes fail and when they do, they can take all of the data with them. Then there&#8217;s the additional issue of accidental damage (fire, flood, etc.). What&#8217;s really required (in a home scenario), is two or more removable hard disks, combined with use of a utility such as <a href=\"http:\/\/en.wikipedia.org\/wiki\/Rsync\">rsync<\/a> (Unix) or <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/06\/keeping-files-synchronised-between.htm\">SyncToy<\/a> (Windows) to automate frequent backups, with one of the disks kept off site (e.g. with a family member) and frequent disk rotation.<\/p>\n<p>In an enterprise environment I wouldn&#8217;t consider implementing a server without some form of RAID (and other redundant technologies) installed; however I&#8217;d also have a comprehensive backup strategy. For homes and small businesses RAID is not the answer &#8211; what&#8217;s really required is a means of easily ensuring that data is secured so that if a disaster should occur, then those precious files will not be lost forever.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I recently came across Gina Trapani&#8217;s article on the importance of backing up (the comments are worth a read too). I hear what she&#8217;s saying &#8211; a couple of years ago I very nearly lost a lot of data when a hard disk died and today I have far more important stuff on disk (like &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/07\/why-raid-alone-is-not-answer-for.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Why RAID alone is not the answer for backups<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[55],"class_list":["post-632","post","type-post","status-publish","format-standard","hentry","tag-storage"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why RAID alone is not the answer for backups - markwilson.it<\/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:\/\/www.markwilson.co.uk\/blog\/2006\/07\/why-raid-alone-is-not-answer-for.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why RAID alone is not the answer for backups - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"I recently came across Gina Trapani&#8217;s article on the importance of backing up (the comments are worth a read too). I hear what she&#8217;s saying &#8211; a couple of years ago I very nearly lost a lot of data when a hard disk died and today I have far more important stuff on disk (like &hellip; Continue reading Why RAID alone is not the answer for backups\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/07\/why-raid-alone-is-not-answer-for.htm\" \/>\n<meta property=\"og:site_name\" content=\"markwilson.it\" \/>\n<meta property=\"article:published_time\" content=\"2006-07-17T23:51:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2007-03-09T11:54:58+00:00\" \/>\n<meta name=\"author\" content=\"Mark Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:site\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mark Wilson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/07\\\/why-raid-alone-is-not-answer-for.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/07\\\/why-raid-alone-is-not-answer-for.htm\"},\"author\":{\"name\":\"Mark Wilson\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"headline\":\"Why RAID alone is not the answer for backups\",\"datePublished\":\"2006-07-17T23:51:00+00:00\",\"dateModified\":\"2007-03-09T11:54:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/07\\\/why-raid-alone-is-not-answer-for.htm\"},\"wordCount\":385,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"keywords\":[\"Storage\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/07\\\/why-raid-alone-is-not-answer-for.htm#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/07\\\/why-raid-alone-is-not-answer-for.htm\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/07\\\/why-raid-alone-is-not-answer-for.htm\",\"name\":\"Why RAID alone is not the answer for backups - markwilson.it\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\"},\"datePublished\":\"2006-07-17T23:51:00+00:00\",\"dateModified\":\"2007-03-09T11:54:58+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/07\\\/why-raid-alone-is-not-answer-for.htm#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/07\\\/why-raid-alone-is-not-answer-for.htm\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/07\\\/why-raid-alone-is-not-answer-for.htm#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Why RAID alone is not the answer for backups\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/\",\"name\":\"markwilson.it\",\"description\":\"get-info -class technology | write-output &gt; 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I did lose data once when the hard disk in a Dell laptop died but then, last week, the disk in one of my external Toshiba PX1223E-1G32 (320GB 7200 RPM external USB 2.0\u2026","rel":"","context":"In \"PC Hardware\"","block_context":{"text":"PC Hardware","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/pc-hardware"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":784,"url":"https:\/\/www.markwilson.co.uk\/blog\/2007\/05\/recovering-data-after-destroying-the-mac-os-x-partition-table.htm","url_meta":{"origin":632,"position":1},"title":"Recovering data after destroying the Mac OS X partition table","author":"Mark Wilson","date":"Thursday 10 May 2007","format":false,"excerpt":"I'm not a religious man but every once in a while I do something stupid and find myself hoping for some divine intervention. 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Justifiably, I'd say: I have an exam tomorrow that I haven't finished preparing for; one or both of my kids has woken me up at least once a night (or early in the morning) since I-can't-remember-when; and this morning\u2026","rel":"","context":"In \"PC Hardware\"","block_context":{"text":"PC Hardware","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/pc-hardware"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":822,"url":"https:\/\/www.markwilson.co.uk\/blog\/2007\/06\/problems-copying-files-from-a-backup-restored-by-thinking-laterally.htm","url_meta":{"origin":632,"position":3},"title":"Problems copying files from a backup&#8230; restored by thinking laterally","author":"Mark Wilson","date":"Saturday 16 June 2007","format":false,"excerpt":"I don't generally talk about my work (at least not directly) on this blog but, a couple of weeks back, I moved into a new role, which is going to involve working very closely with a certain software company from Redmond (and no, it won't have any effect on the\u2026","rel":"","context":"In \"Linux\"","block_context":{"text":"Linux","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/linux"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":782,"url":"https:\/\/www.markwilson.co.uk\/blog\/2007\/05\/defragmenting-a-mac-os-x-hard-disk.htm","url_meta":{"origin":632,"position":4},"title":"Defragmenting a Mac OS X hard disk","author":"Mark Wilson","date":"Sunday 6 May 2007","format":false,"excerpt":"Apple claims that OS X is the world's most advanced operating system. 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