{"id":42,"date":"2009-01-27T00:30:48","date_gmt":"2009-01-27T05:30:48","guid":{"rendered":"http:\/\/www.bhargavs.com\/index.php\/technology\/2009\/01\/das-vs-san-in-exchange-2007"},"modified":"2009-01-27T00:30:48","modified_gmt":"2009-01-27T05:30:48","slug":"das-vs-san-in-exchange-2007","status":"publish","type":"post","link":"https:\/\/bhargavs.com\/index.php\/2009\/01\/27\/das-vs-san-in-exchange-2007\/","title":{"rendered":"DAS vs. SAN in Exchange 2007"},"content":{"rendered":"<p>I have spent a lot of time recently investigating storage solutions as part of a migration design for Exchange 2007.<\/p>\n<p>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&#160; CCR\/SCR solution to allow for data redundancy, disaster recovery, and site resiliency. The toughest decision that I have been faced with (given that I am not a storage guru) is in storage design. Should it be a DAS or SAN based solution? Each has benefits and negatives. Here are my random thoughts on the subject.<\/p>\n<p><strong>Performance:<\/strong><\/p>\n<p>Traditionally storage has always been the bottleneck in systems hosting heavy IO applications like Exchange. With the transition to 64-bit in Exchange 2007, IO has been significantly reduced. This has allowed DAS (mainly Serial-Attached SCSI) to become a viable alternative solution for Exchange deployments.<\/p>\n<p><strong>Scalability:<\/strong><\/p>\n<p>SANs are very scalable but as they scale the TCO increases. DAS based solutions are able to scale less but at a much lower cost.<\/p>\n<p><strong>Availability:<\/strong><\/p>\n<p>Any shared storage represents a single point of failure. Although it is rare for a SAN to fail, anything is possible. The HA and DR solutions offered by SAN vendors are generally very expensive and difficult to implement and support. The CCR\/SCR solutions offered by Exchange 2007 in combination with DAS storage, offer a lower cost and easier to manage, high availability solution.<\/p>\n<p><strong>Cost:<\/strong><\/p>\n<p>DAS based solutions can offer a significant cost savings over SAN based storage.<\/p>\n<p><strong>Some additional points to consider:<\/strong><\/p>\n<p><strong>Footprint<\/strong> \u2013 DAS based storage array cabinets from most vendors (HP, Dell) that I have investigated, require 2U of rack space each. Any significant storage requirements would lead to significant rack space, power, and cooling requirements.<\/p>\n<p><strong>Administration<\/strong> \u2013 DAS allows for more centralized control of the storage configuration by the messaging team. The setup and maintenance is less complex than prior SAN configurations and does not include the need&#160; to rely on a storage administrator for assistance.<\/p>\n<p>This is an interesting and important area to investigate as part of any Exchange deployment. As with any solution, a lot depends on what you current requirement is and future requirements are.<\/p>\n<p><strong>References:<\/strong><\/p>\n<p><a title=\"http:\/\/technet.microsoft.com\/en-us\/library\/cc500980.aspx\" href=\"http:\/\/technet.microsoft.com\/en-us\/library\/cc500980.aspx\">http:\/\/technet.microsoft.com\/en-us\/library\/cc500980.aspx<\/a><\/p>\n<p><a title=\"http:\/\/www.emc.com\/collateral\/demos\/microsites\/mediaplayer-video\/henderson-exchange.htm\" href=\"http:\/\/www.emc.com\/collateral\/demos\/microsites\/mediaplayer-video\/henderson-exchange.htm\">http:\/\/www.emc.com\/collateral\/demos\/microsites\/mediaplayer-video\/henderson-exchange.htm<\/a><\/p>\n<p><a title=\"http:\/\/msexchangeteam.com\/archive\/2006\/10\/05\/429103.aspx\" href=\"http:\/\/msexchangeteam.com\/archive\/2006\/10\/05\/429103.aspx\">http:\/\/msexchangeteam.com\/archive\/2006\/10\/05\/429103.aspx<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I have spent a lot of time recently investigating storage solutions as part of a migration design for Exchange 2007. The current implemented solution is a multi-node Exchange 2003 cluster [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","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":[51,40],"tags":[107,121,127,230,248],"class_list":["post-42","post","type-post","status-publish","format-standard","hentry","category-exchange-2007","category-exchange-server","tag-das","tag-exchange-2007","tag-exchange-server","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>DAS vs. SAN in Exchange 2007 - Bhargav&#039;s IT Playground<\/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:\/\/bhargavs.com\/index.php\/2009\/01\/27\/das-vs-san-in-exchange-2007\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DAS vs. SAN in Exchange 2007 - Bhargav&#039;s IT Playground\" \/>\n<meta property=\"og:description\" content=\"I have spent a lot of time recently investigating storage solutions as part of a migration design for Exchange 2007. 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Discussion goes on\u2026","author":"Bhargav","date":"June 23, 2009","format":false,"excerpt":"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 money? What about performance? How do I manage storage silos? Troubleshooting complexities in SAN deployments\u2026 many questions and many views,\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":1679,"url":"https:\/\/bhargavs.com\/index.php\/2012\/05\/03\/exchange-management-shell-error-500-internal-server-error\/","url_meta":{"origin":42,"position":1},"title":"Exchange Management Shell Error 500 &#8211; Internal Server Error","author":"Bhargav","date":"May 3, 2012","format":false,"excerpt":"I have come across this issue enough times that even if it is documented on TechNet it deserves mention here. When you launch Exchange Management Shell or try to connect to an Exchange 2010 Server remotely using PowerShell, you get error \u201c500 \u2013 Internal Server Error. There is a problem\u2026","rel":"","context":"In &quot;Exchange 2010&quot;","block_context":{"text":"Exchange 2010","link":"https:\/\/bhargavs.com\/index.php\/category\/microsoft\/exchange-server\/exchange-2010\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1623,"url":"https:\/\/bhargavs.com\/index.php\/2009\/01\/27\/exchange-2007-rpc-client-throttling\/","url_meta":{"origin":42,"position":2},"title":"Back-Off now, will ya?!","author":"Bhargav","date":"January 27, 2009","format":false,"excerpt":"It is well known that an Outlook client sending too many RPC connections per second could result in overall Exchange server performance degradation. It could be a desktop search engine, e-mail archiving products, custom apps written to manipulate exchange mailbox data\u2026 the list goes on. In the past, the solution\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":485,"url":"https:\/\/bhargavs.com\/index.php\/2012\/11\/26\/createcluster-failed-with-0x5-adding-members-to-dag-in-exchange-2013\/","url_meta":{"origin":42,"position":3},"title":"CreateCluster() failed with 0x5 adding members to DAG in Exchange 2013","author":"Bhargav","date":"November 26, 2012","format":false,"excerpt":"UPDATE: While TechNet article \u201cCreate a Database Availability Group\u201d only mentions Windows 2008 R2 domain controllers, I must thank Scott Schnoll for the following clarification: \"Creating an Exchange 2013 DAG with Mailbox servers on Windows Server 2012? You must pre-stage CNO before adding first server!\". TechNet documentation will be updated\u2026","rel":"","context":"In &quot;Exchange 2013&quot;","block_context":{"text":"Exchange 2013","link":"https:\/\/bhargavs.com\/index.php\/category\/microsoft\/exchange-server\/exchange-2013\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":211,"url":"https:\/\/bhargavs.com\/index.php\/2009\/12\/14\/how-do-i-check-update-rollup-version-on-exchange-20xx-server\/","url_meta":{"origin":42,"position":4},"title":"How do I check Update Rollup version on Exchange 20xx Server?","author":"Bhargav","date":"December 14, 2009","format":false,"excerpt":"UPDATED: Feb 26, 2014, updated script to accommodate Exchange 2013 Now that Update Rollup for Exchange Server 2010 is available, I have updated my previous script to check for Update Rollup versions on both Exchange Server 2007 and Exchange Server 2010. No need to have two versions of script. Just\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":1634,"url":"https:\/\/bhargavs.com\/index.php\/2009\/08\/25\/exchange-2007-service-pack-2-released\/","url_meta":{"origin":42,"position":5},"title":"Exchange 2007 Service Pack 2 Released","author":"Bhargav","date":"August 25, 2009","format":false,"excerpt":"Exchange 2007 Service Pack 2 has been released! I in particular have been waiting for this as transition from Exchange 2007 to Exchange 2010 and co-existence of both products in single environment requires Exchange 2007 servers running SP2. If you missed it, it is documented by Exchange Team here in\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":[]}],"jetpack_shortlink":"https:\/\/wp.me\/pkROc-G","_links":{"self":[{"href":"https:\/\/bhargavs.com\/index.php\/wp-json\/wp\/v2\/posts\/42","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bhargavs.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bhargavs.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bhargavs.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bhargavs.com\/index.php\/wp-json\/wp\/v2\/comments?post=42"}],"version-history":[{"count":0,"href":"https:\/\/bhargavs.com\/index.php\/wp-json\/wp\/v2\/posts\/42\/revisions"}],"wp:attachment":[{"href":"https:\/\/bhargavs.com\/index.php\/wp-json\/wp\/v2\/media?parent=42"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bhargavs.com\/index.php\/wp-json\/wp\/v2\/categories?post=42"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bhargavs.com\/index.php\/wp-json\/wp\/v2\/tags?post=42"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}