{"id":5604,"date":"2015-05-11T12:00:28","date_gmt":"2015-05-11T11:00:28","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/?p=5604"},"modified":"2015-05-16T15:54:52","modified_gmt":"2015-05-16T14:54:52","slug":"working-with-the-exchange-2013-server-role-requirements-calculator","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2015\/05\/working-with-the-exchange-2013-server-role-requirements-calculator.htm","title":{"rendered":"Working with the Exchange 2013 Server Role Requirements Calculator"},"content":{"rendered":"<p>For the last couple of years, I&#8217;ve had the privilege of leading a team of talented Exchange and Lync subject matter experts\u00a0(either\u00a0directly or more recently as a virtual team). \u00a0I&#8217;ve tried to keep up my technical skills but inevitably I&#8217;m\u00a0not at the level of detail I\u00a0once was\u00a0and,\u00a0<a href=\"https:\/\/www.markwilson.co.uk\/blog\/2015\/05\/moving-on.htm\">as I switch to a more technical\u00a0role<\/a>,\u00a0I&#8217;m expecting to\u00a0have to\u00a0re-learn a lot.<\/p>\n<p>Thankfully, I won&#8217;t be alone &#8211; the team I&#8217;m joining is also full of talented subject matter experts &#8211; but I will need to stand on my own two feet.<\/p>\n<p>That&#8217;s why I thought I&#8217;d write this post, with a few notes that are based on a recent conversation when my former colleague\u00a0Mark Bodley checked over the\u00a0Exchange calculations I&#8217;d used to create a guide price\u00a0for a customer solution&#8230; [I&#8217;ve since\u00a0made a couple of extra\u00a0edits based on advice from Fujitsu&#8217;s resident Exchange Master, Nick Parlow]<\/p>\n<h3>Inputs<\/h3>\n<p>To get started, some educated guesses can be made to adjust the defaults:<\/p>\n<ul>\n<li>Exchange environment configuration:\n<ul>\n<li>64-bit GCs, multi-role servers, non-virtualised, HA deployment (in line with\u00a0our\u00a0design principles).<\/li>\n<li>Set number of servers per DAG\u00a0and number of DAGs according to size of solution. Start DAG count low to keep\u00a0hardware down &#8211; revise up later if required based on guidance elsewhere in the tool.<\/li>\n<\/ul>\n<\/li>\n<li>Site resilience configuration:\n<ul>\n<li>Single active\/active resilient DAG (i.e. no passive servers).<\/li>\n<li>Watch the RPO value &#8211; it won&#8217;t affect the server count but could be a factor in inter-datacentre bandwidth calculations.<\/li>\n<\/ul>\n<\/li>\n<li>Mailbox database copy configuration:\n<ul>\n<li>Increased HA database copies to 4; decreased lagged copies to 0 (lagged copies require more storage as transaction logs are retained for longer).<\/li>\n<li>Increased\u00a0number of HA database copies in secondary datacentre to account for non-lagged copies\u00a0(in this case I had a 50\/50 split between DCs).<\/li>\n<\/ul>\n<\/li>\n<li>Lagged database copy configuration: not used.<\/li>\n<li>Exchange data configuration: left at defaults.<\/li>\n<li>Database configuration: left at defaults.<\/li>\n<li>Exchange\u00a0I\/O configuration: left at defaults<\/li>\n<li>Transport configuration:\n<ul>\n<li>Set Safety Net expiration to 2 days (unless using lagged\u00a0copies).<\/li>\n<\/ul>\n<\/li>\n<li>User mailbox configuration:\n<ul>\n<li>One tier for each logical group of users.<\/li>\n<li>Days in work week set to 5 &#8211; unless there are significant groups of people working 7 days a week (affects log replication).<\/li>\n<li>Mailbox configuration values will depend on organisation but the advice given for a starting point was to set:\n<ul>\n<li>Total send\/receive capacity per mailbox per day to 100 (down from 200) messages.<\/li>\n<li>Average messages size to 150KB (affects storage).<\/li>\n<li>Mailbox size limits are used for capacity growth planning &#8211; split between main and personal archive should not affect the calculations.<\/li>\n<li>Deleted item retention window may need to be increased to meet requirements (14 days is low if not using backups).<\/li>\n<li>Multiplication factors come into play with mobile devices.<\/li>\n<li>Desktop search engine value is more significant in Citrix environments than with Outlook cached mode clients.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>Backup configuration:\n<ul>\n<li>Assumed software VSS via SCDPM, daily full backups.<\/li>\n<li>Calculator will take highest value of backup\/truncation failure tolerance and network failure tolerance (so only one of these really matters!).<\/li>\n<\/ul>\n<\/li>\n<li>Storage options:\n<ul>\n<li>JBOD with multiple databases per disk (in line with our design principles).<\/li>\n<li>Main thing to watch here is the number of auto reseed volumes per server &#8211; align to failure rate of the disks.<\/li>\n<\/ul>\n<\/li>\n<li>Disk configuration: will depend on servers in use. For reference, with our Fujitsu PRIMERGY servers, the available options led us to:\n<ul>\n<li>900GB system\u00a0disks (10K RPM\u00a0SAS 2.5&#8243;).<\/li>\n<li>4000GB database plus\u00a0log disks (7.2K RPM SATA 3.5&#8243;).<\/li>\n<li>4000GB restore volume\u00a0(7.2K RPM SATA 3.5&#8243;).<\/li>\n<\/ul>\n<\/li>\n<li>Processor configuration:\n<ul>\n<li>Core\/server is of secondary interest but helps the calculator to advise on Global Catalog cores.<\/li>\n<li>SPECint2006 value set to the lowest that will allow a suitable server utilisation number. In practice there will be a balance between servers\/processor options and price. It&#8217;s useful to have a lookup of SPECint2006 values for a range of servers (e.g. Fujitsu PRIMERGY RX300) or <a href=\"https:\/\/www.spec.org\/cgi-bin\/osgresults?conf=rint2006\">you can search the SPECint site<\/a>\u00a0and take the value from the result column.<\/li>\n<\/ul>\n<\/li>\n<li>\u00a0 Log replication configuration:\n<ul>\n<li>Will vary according to environment (and international spread of users)\u00a0but rule of thumb used was (this should add up to 100%):\n<ul>\n<li>1: 0.33%.<\/li>\n<li>2: 0.24%.<\/li>\n<li>3: 0.24%.<\/li>\n<li>4: 0.2%.<\/li>\n<li>5: 0.82% (I&#8217;m not sure why we have a night-time peak &#8211; automated emails sent overnight? Or this could be spread across others&#8230;)<\/li>\n<li>6: 0.31%.<\/li>\n<li>7: 0.34%.<\/li>\n<li>8: 1.46%.<\/li>\n<li>9: 6.46%.<\/li>\n<li>10: 10.08%.<\/li>\n<li>11: 10.55%.<\/li>\n<li>12: 11.06%.<\/li>\n<li>13: 9.48%.<\/li>\n<li>14: 9.61%.<\/li>\n<li>15: 10.52%.<\/li>\n<li>16: 10.41%.<\/li>\n<li>17: 8.31%.<\/li>\n<li>18: 5.07%.<\/li>\n<li>19: 1.94%.<\/li>\n<li>20: 0.95%.<\/li>\n<li>21: 0.84% (I might be tempted to up this slightly for the\u00a0evening email check in many organisations&#8230;).<\/li>\n<li>22: 0.36%.<\/li>\n<li>23: 0.21%.<\/li>\n<li>24: 0.21%.<\/li>\n<\/ul>\n<\/li>\n<li>Network configuration: latency will depend on available\u00a0datacentre connectivity.<\/li>\n<\/ul>\n<\/li>\n<li>Environment customisation: only used to generate naming configuration.<\/li>\n<\/ul>\n<h3>Check the results<\/h3>\n<p>With the main inputs in place, some fine tuning is probably required:<\/p>\n<ul>\n<li>Role requirements:\n<ul>\n<li>Watch out for errors (e.g. over-utilised servers). \u00a0This is where the server count\u00a0may need to be adjusted, or a higher-specification server used (SPECint2006 values).\u00a0Ideally, servers should be close to 80% utilised [in a failure scenario] but not over. Getting the right CPU is more critical than memory as RAM can normally\u00a0be added later! [also bear in mind the impact of other software on utilisation &#8211; for example\u00a0file level antivirus, and any message hygiene software running on the box.]<\/li>\n<li>Also check the\u00a0recommended transport database location (we&#8217;ll come back to that in a moment).<\/li>\n<\/ul>\n<\/li>\n<li>Volume requirements:\n<ul>\n<li>Watch out for disk sizes\/configurations that can&#8217;t be met! \u00a0If the solution is storage-bound, then it may be necessary to add additional servers (we use direct attached storage as a design principle) or, if available, then larger commodity disks would help.\u00a0One clue to a potential issue is if the DB and log volume design\/server table has DBx as a database copy name, rather than DB1-DB4, etc.<\/li>\n<\/ul>\n<\/li>\n<li>Storage design: confirms\u00a0(or otherwise) that the solution can be deployed\u00a0in a JBOD configuration\u00a0(as per our design principles, although RAID is also an option).\n<ul>\n<li>This worksheet\u00a0will also give the number of disks required in each server.\u00a0Note that this is the count for database and log disks, restore volumes and auto reseed volumes &#8211; don&#8217;t forget the system disks for operating system\/application binaries&#8230; and then think about the transport database.<\/li>\n<li>In my solution, the recommended transport database location (from the role requirements) was\u00a0the system disk but we were using 900GB 10K RPM SAS\u00a03.5&#8243; disks. With OS (150GB), Anchor LUN (2GB), Exchange binaries (50GB), and consideration for Exchange Logs (maybe 600GB)\u00a0those disks are already pretty full, so it&#8217;s worth considering an extra RAID 1\u00a0volume for the transport database (over-ruling the calculator) and possibly hot spares for the RAID volumes too (depending on your attitude to risk).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>A couple of other points to consider: public folders and unified messaging. I didn&#8217;t need public folders\u00a0but don&#8217;t overlook them in your plans if they are in use. \u00a0As for unified messaging, it&#8217;s\u00a0no longer a server role so is included in the calculations, up to a point &#8211; UM is likely to hit the CPU load, so it might be prudent\u00a0to factor in some additional headroom with the SPECint2006 of the servers (to keep the utilisation well below the 80% mark).<\/p>\n<h3>YMMV<\/h3>\n<p>Of course, there are just my notes on some of the things I checked\u00a0to fit\u00a0our reference\u00a0design and they are not exhaustive. As the saying goes, your mileage may vary. For reference, I was using\u00a0<a href=\"https:\/\/gallery.technet.microsoft.com\/Exchange-2013-Server-Role-f8a61780\">Exchange 2013 Server Role Requirements Calculator v6.6<\/a>\u00a0but\u00a0<a href=\"http:\/\/aka.ms\/E2013Calc\">you should always use the latest available version<\/a>\u00a0and\u00a0there is a very useful\u00a0<a href=\"https:\/\/gallery.technet.microsoft.com\/Exchange-2013-Server-Role-c81ac1cf\">readme file<\/a>\u00a0which should be referenced\u00a0when working with the calculator.\u00a0You should also\u00a0<a href=\"http:\/\/blogs.technet.com\/b\/exchange\/archive\/2013\/05\/06\/ask-the-perf-guy-sizing-exchange-2013-deployments.aspx\">factor in this guidance on sizing Exchange 2013 deployments<\/a>\u00a0and consider the\u00a0<a href=\"https:\/\/technet.microsoft.com\/en-us\/library\/dn879084(v=exchg.150).aspx\">Exchange 2013 performance recommendations<\/a> too.<\/p>\n<p>&nbsp;<\/p>\n<p>[Edited 16 May 2015 to\u00a0clarify comments re: server utilisation]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>For the last couple of years, I&#8217;ve had the privilege of leading a team of talented Exchange and Lync subject matter experts\u00a0(either\u00a0directly or more recently as a virtual team). \u00a0I&#8217;ve tried to keep up my technical skills but inevitably I&#8217;m\u00a0not at the level of detail I\u00a0once was\u00a0and,\u00a0as I switch to a more technical\u00a0role,\u00a0I&#8217;m expecting to\u00a0have &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2015\/05\/working-with-the-exchange-2013-server-role-requirements-calculator.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Working with the Exchange 2013 Server Role Requirements Calculator<\/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":[218],"tags":[46],"class_list":["post-5604","post","type-post","status-publish","format-standard","hentry","category-technology","tag-exchange"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Working with the Exchange 2013 Server Role Requirements Calculator - 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\/2015\/05\/working-with-the-exchange-2013-server-role-requirements-calculator.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Working with the Exchange 2013 Server Role Requirements Calculator - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"For the last couple of years, I&#8217;ve had the privilege of leading a team of talented Exchange and Lync subject matter experts\u00a0(either\u00a0directly or more recently as a virtual team). \u00a0I&#8217;ve tried to keep up my technical skills but inevitably I&#8217;m\u00a0not at the level of detail I\u00a0once was\u00a0and,\u00a0as I switch to a more technical\u00a0role,\u00a0I&#8217;m expecting to\u00a0have &hellip; 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