{"id":138,"date":"2009-06-23T17:32:43","date_gmt":"2009-06-23T22:32:43","guid":{"rendered":"http:\/\/www.bhargavs.com\/index.php\/exchange-server\/exchange-2007-exchange-server\/2009\/06\/exchange-2007-das-san-discussion\/"},"modified":"2009-06-23T17:32:43","modified_gmt":"2009-06-23T22:32:43","slug":"exchange-2007-das-san-discussion","status":"publish","type":"post","link":"https:\/\/bhargavs.com\/index.php\/2009\/06\/23\/exchange-2007-das-san-discussion\/","title":{"rendered":"Exchange 2007 DAS or SAN? Discussion goes on\u2026"},"content":{"rendered":"<p>I have read about it in many places and my friend Rob actually posted once <a href=\"http:\/\/www.bhargavs.com\/index.php\/exchange-server\/2009\/01\/das-vs-san-in-exchange-2007\/\" target=\"_blank\" rel=\"noopener noreferrer\">here<\/a> about it. Should I use SAN for my Exchange 2007? Will DAS save me money? What about performance? How do I manage storage silos? Troubleshooting complexities in SAN deployments\u2026 many questions and many views, but rarely an answer.<\/p>\n<p>There is a reason for it. One cannot definitively answer this question. There are collaterals published by both Microsoft and Storage vendors. Each for obvious reasons promoting different solution.<\/p>\n<p>Microsoft IT published a <a href=\"http:\/\/technet.microsoft.com\/en-us\/library\/cc500980.aspx\" target=\"_blank\" rel=\"noopener noreferrer\">whitepaper<\/a> that discussed how Exchange 2007 storage solution was designed and what went into the decision process. Everyone has been reading into the cost savings not realizing that\u2019s not the only takeaway from that whitepaper. To summarize, the following factors played key role:<\/p>\n<ul>\n<li>Previous SAN failure and it\u2019s impact on availability<\/li>\n<li>Dependency on another group for managing and troubleshooting storage related issues<\/li>\n<li>Scaling to higher capacity for each mailbox while controlling costs associated with storage<\/li>\n<\/ul>\n<p>And these were not the only factors so don\u2019t respond to me with list of other factors that I did not list here.<\/p>\n<p>Microsoft IT deployed DAS based solution and shared their challenges, decision process and outcome along with benefits they reap from the solution implemented.<\/p>\n<p>At the end of the day, the decision is going to be made based on lot of factors including business reasons. Business reasons playing a key role in decisions that will decide if you will implement SAN or DAS. Few I will list here:<\/p>\n<ul>\n<li>Existing investment in SAN solutions<\/li>\n<li>Existing knowledge and expertise in SAN solutions<\/li>\n<li>Management of storage (who is responsible? Application group or Storage group)<\/li>\n<li>Cost to implement DAS solution (learning curve, procedures, staff training, support)<\/li>\n<li>Operational framework and responsibilities (who should manage storage)<\/li>\n<li>Willingness of Storage group to dedicate storage and guarantee performance (dedicated disks on shared array vs. shared disks on shared array)<\/li>\n<li>SLAs, Tolerances, Dependencies, Time to recover\u2026 the list goes on<\/li>\n<\/ul>\n<p>As you can see, the factors I listed above are not all technical. Business decisions are made by asking these questions along with facts that answer technical questions related to performance, MTBF, complexity to implement and manage\/troubleshoot and so on.<\/p>\n<p>In the end, I am not writing this post to tell you what is the best answer to DAS vs SAN debate. I am writing this to give you some questions that can help you decide for yourself what is best for your environment.<\/p>\n<p>&#160;<\/p>\n<p>\u201cWe are our best friend or worst enemies.\u201d<\/p>\n<p>&#160;<\/p>\n<p>Some references to aggregate:<\/p>\n<p><a href=\"http:\/\/technet.microsoft.com\/en-us\/library\/cc500980.aspx\" target=\"_blank\" rel=\"noopener noreferrer\">How Microsoft IT Exceeds High-Availability Targets with Large Mailboxes at Low Costs Based on New Storage Designs<\/a><\/p>\n<p><a href=\"http:\/\/blogs.msdn.com\/douggowans\/archive\/2008\/04\/21\/some-more-thoughts-on-san-v-das-is-it-actually-time-to-consider-das.aspx\" target=\"_blank\" rel=\"noopener noreferrer\">Some more thoughts on SAN v DAS. Is it actually time to consider DAS? \u2013 Doug Owans<\/a><\/p>\n<p><a href=\"http:\/\/www.emc.com\/collateral\/demos\/microsites\/mediaplayer-video\/henderson-exchange.htm\" target=\"_blank\" rel=\"noopener noreferrer\">Brian Henderson \u2013 Microsoft Exchange Server 2007 Storage Considerations: DAS or SAN<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I have read about it in many places and my friend Rob actually posted once here about it. Should I use SAN for my Exchange 2007? Will DAS save me [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pgc_sgb_lightbox_settings":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[51],"tags":[107,121,230,248],"class_list":["post-138","post","type-post","status-publish","format-standard","hentry","category-exchange-2007","tag-das","tag-exchange-2007","tag-san","tag-storage"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Exchange 2007 DAS or SAN? 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The current implemented solution is a multi-node Exchange 2003 cluster with SAN based storage (No HA\/DR). With Exchange 2007 the desire is to deploy a\u00a0 CCR\/SCR solution to allow for\u2026","rel":"","context":"In &quot;Exchange 2007&quot;","block_context":{"text":"Exchange 2007","link":"https:\/\/bhargavs.com\/index.php\/category\/microsoft\/exchange-server\/exchange-2007\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1655,"url":"https:\/\/bhargavs.com\/index.php\/2010\/08\/31\/microsoft-exchange-online-user-group-meeting-september-09\/","url_meta":{"origin":138,"position":1},"title":"Microsoft Exchange Online\u2013User Group Meeting September 09","author":"Bhargav","date":"August 31, 2010","format":false,"excerpt":"Philadelphia Area Exchange Server User Group is hosting a meeting on September 9, dedicated to Microsoft Exchange Online! Many have been asking what does Microsoft Online offer? What does it mean? How do I upgrade my skills for new type of computing that is gaining popularity rapidly. Well, we are\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":58,"url":"https:\/\/bhargavs.com\/index.php\/2009\/02\/25\/pae-exchange-2003-servers\/","url_meta":{"origin":138,"position":2},"title":"Why should I use \/PAE on my Exchange 2003 servers?","author":"Bhargav","date":"February 25, 2009","format":false,"excerpt":"Many times I come across the configurations where the servers physically have 4GB memory installed but OS does not see it all. OS usually reports between 512 to 768 MB less! Running Exchange 2003 on such server with recommended memory tuning parameters as documented in my previous post, makes it\u2026","rel":"","context":"In &quot;Exchange 2003&quot;","block_context":{"text":"Exchange 2003","link":"https:\/\/bhargavs.com\/index.php\/category\/microsoft\/exchange-server\/exchange-2003\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":167,"url":"https:\/\/bhargavs.com\/index.php\/2009\/09\/21\/microsoft-support-exchange-2007-databases-bitlocker-encrypted-drive\/","url_meta":{"origin":138,"position":3},"title":"Who knew? Does Microsoft support Exchange 2007 Databases on BitLocker Encrypted drive?","author":"Bhargav","date":"September 21, 2009","format":false,"excerpt":"Did you know that Microsoft has tested and fully supports Exchange 2007 Databases on BitLocker encrypted drive? That does mean you will need Windows 2008 with BitLocker encryption enabled. If you are willing to go that for for securing your servers, Microsoft is committed to supporting your secure configuration! You\u2026","rel":"","context":"In &quot;Exchange 2007&quot;","block_context":{"text":"Exchange 2007","link":"https:\/\/bhargavs.com\/index.php\/category\/microsoft\/exchange-server\/exchange-2007\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":205,"url":"https:\/\/bhargavs.com\/index.php\/2009\/11\/20\/verify-exchange-server-schema-version\/","url_meta":{"origin":138,"position":4},"title":"Verify Exchange Server Schema Version","author":"Bhargav","date":"November 20, 2009","format":false,"excerpt":"UPDATED Feb 25, 2014 to include Exchange 2013 Service Pack 1 information. Since Microsoft has a dedicated TechNet article on this topic, I will no longer update this post. You can find updated information here: http:\/\/technet.microsoft.com\/en-us\/library\/bb125224(v=exchg.150).aspx When you run Exchange Setup to prepare schema, usually the very next question is,\u2026","rel":"","context":"In &quot;Exchange 2003&quot;","block_context":{"text":"Exchange 2003","link":"https:\/\/bhargavs.com\/index.php\/category\/microsoft\/exchange-server\/exchange-2003\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1670,"url":"https:\/\/bhargavs.com\/index.php\/2011\/08\/22\/microsoft-exchange-2010-powershell-cookbook-review\/","url_meta":{"origin":138,"position":5},"title":"Microsoft Exchange 2010 PowerShell Cookbook Review","author":"Bhargav","date":"August 22, 2011","format":false,"excerpt":"Disclaimer: I am not paid to write about this book and the review written here is my own view. I was recently contacted by Packt Publishing about their recently published book \u201cMicrosoft Exchange 2010 PowerShell Cookbook\u201d. 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