{"id":851,"date":"2009-05-25T13:58:00","date_gmt":"2009-05-25T13:58:00","guid":{"rendered":"\/blogs\/paul\/post\/Weekly-survey-maximum-allowable-downtime-target-and-actual.aspx"},"modified":"2017-04-13T09:53:51","modified_gmt":"2017-04-13T16:53:51","slug":"weekly-survey-maximum-allowable-downtime-target-and-actual","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/paul\/weekly-survey-maximum-allowable-downtime-target-and-actual\/","title":{"rendered":"Weekly survey: maximum allowable downtime &#8211; target and actual"},"content":{"rendered":"<p>\n<font face=\"verdana,geneva\" size=\"2\">This week&#39;s survey is inspired by this morning&#39;s Kimberly+Paul hot-tub conversation around data-dependent routing vs. network load balancing, which then turned to SLAs. Yes, we lead an exciting life . <\/font>\n<\/p>\n<p>\n<font face=\"verdana,geneva\" size=\"2\">This survey is a *four*-parter. Part 1 is&nbsp;for each of your databases, which survey option is closest to your target maximum allowable downtime SLA (Service-Level Agreement, a.k.a. RTO &#8211; Recovery Time Objective)? <\/font>\n<\/p>\n<ul>\n<li>\n<div>\n\t<font face=\"verdana,geneva\" size=\"2\">Survey 1 is if your SLA is based on 24&#215;7 operation <\/font>\n\t<\/div>\n<\/li>\n<li>\n<div>\n\t<font face=\"verdana,geneva\" size=\"2\">Survey 2 is if your SLA is based on non-24&#215;7 operation (e.g. allowing for a 6 hour daily maintenance window, the rest of the time we must be available 99.9%) <\/font>\n\t<\/div>\n<\/li>\n<\/ul>\n<p>\n<font face=\"verdana,geneva\" size=\"2\">Part 2 is&nbsp;for each of your databases, what can you actually achieve? <\/font>\n<\/p>\n<ul>\n<li>\n<div>\n\t<font face=\"verdana,geneva\" size=\"2\">Survey 3 is your achievement over the last year for 24&#215;7 operation <\/font>\n\t<\/div>\n<\/li>\n<li>\n<div>\n\t<font face=\"verdana,geneva\" size=\"2\">Survey 4 is your achievement over the last year for non-24&#215;7 operation <\/font>\n\t<\/div>\n<\/li>\n<\/ul>\n<p>\n<font face=\"verdana,geneva\" size=\"2\">I&#39;ll report on the result sometime during the first week of June &#8211; as this is a big survey I&#39;d like to get lots of results. Please repost\/Tweet\/whatever. <\/font>\n<\/p>\n<p>\n<font face=\"verdana,geneva\" size=\"2\">What do I mean by that downtime SLA? Well, however you have it defined. It could be that your SLA is an absolute value based on 24&#215;7 operation, or it could be based on the 9-5 work-day. In all cases, what percentage of the defined time does the system have to be available? Note that I&#39;m calling out a 5, 4, and 3 nines of 24&#215;7 as separate answers as I&#39;d like to see how often these occur and can be met. <\/font>\n<\/p>\n<p>\n<font face=\"verdana,geneva\"><br \/>\n<script>\nem24_survey_x = \"c22c8d89-4762-49fc-a5a3-095e80034d83\";\nem24_survey_width = \"255\";\nem24_survey_height = \"313\";\nem24_styles = \".em24_s {border:solid 1px #626A84; width:250px;} .em24_s td {font-size:12px;} .em24_q {background:#798BC6; color:#ffffff;} .em24_ai0, .em24_at0 {background:#E7F3FF; border-top:1px solid #B3C7D9;} .em24_ai1, .em24_at1 {background:#E3F7DE; border-top:1px solid #B3C7D9;} .em24_v {background:#798BC6}\";<\/script><br \/>\n<script src=\"http:\/\/my.surveypopups.com\/show\/si.js\" type=\"text\/javascript\">\n<\/script><br \/>\n<script>\nem24_survey_x = \"b985b45a-4724-4a64-a8da-0dec6b2891e4\";\nem24_survey_width = \"255\";\nem24_survey_height = \"313\";\nem24_styles = \".em24_s {border:solid 1px #626A84; width:250px;} .em24_s td {font-size:12px;} .em24_q {background:#798BC6; color:#ffffff;} .em24_ai0, .em24_at0 {background:#E7F3FF; border-top:1px solid #B3C7D9;} .em24_ai1, .em24_at1 {background:#E3F7DE; border-top:1px solid #B3C7D9;} .em24_v {background:#798BC6}\";<\/script><br \/>\n<script src=\"http:\/\/my.surveypopups.com\/show\/si.js\" type=\"text\/javascript\">\n<\/script><font size=\"2\"><\/font><\/font>\n<\/p>\n<p><script>\nem24_survey_x = \"5c9a5d79-7176-47ec-90ef-90a57f32dc0a\";\nem24_survey_width = \"255\";\nem24_survey_height = \"313\";\nem24_styles = \".em24_s {border:solid 1px #626A84; width:250px;} .em24_s td {font-size:12px;} .em24_q {background:#798BC6; color:#ffffff;} .em24_ai0, .em24_at0 {background:#E7F3FF; border-top:1px solid #B3C7D9;} .em24_ai1, .em24_at1 {background:#E3F7DE; border-top:1px solid #B3C7D9;} .em24_v {background:#798BC6}\";<\/script><br \/>\n<script src=\"http:\/\/my.surveypopups.com\/show\/si.js\" type=\"text\/javascript\">\n<\/script><br \/>\n<script>\nem24_survey_x = \"978f74e3-21c5-4dd9-9883-2700126ce306\";\nem24_survey_width = \"255\";\nem24_survey_height = \"313\";\nem24_styles = \".em24_s {border:solid 1px #626A84; width:250px;} .em24_s td {font-size:12px;} .em24_q {background:#798BC6; color:#ffffff;} .em24_ai0, .em24_at0 {background:#E7F3FF; border-top:1px solid #B3C7D9;} .em24_ai1, .em24_at1 {background:#E3F7DE; border-top:1px solid #B3C7D9;} .em24_v {background:#798BC6}\";<\/script><br \/>\n<script src=\"http:\/\/my.surveypopups.com\/show\/si.js\" type=\"text\/javascript\">\n<\/script><\/p>\n<p>\n<font face=\"verdana,geneva\" size=\"2\">As always, a big Thanks! for contributing to the blog by responding. Please shoot me an email (Contact button, bottom left of the blog), or ping me on Twitter (<\/font><a href=\"https:\/\/twitter.com\/PaulRandal\"><font face=\"verdana,geneva\" size=\"2\">@PaulRandal<\/font><\/a><font face=\"verdana,geneva\" size=\"2\">)&nbsp;if you have an idea for a good survey. <\/font>\n<\/p>\n<p>\n<font face=\"verdana,geneva\" size=\"2\">PS No comments on this post please (I&#39;ll delete them straight away) &#8211; please wait for the survey results post to avoid skewing the answers. <\/font><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This week&#39;s survey is inspired by this morning&#39;s Kimberly+Paul hot-tub conversation around data-dependent routing vs. network load balancing, which then turned to SLAs. Yes, we lead an exciting life . This survey is a *four*-parter. Part 1 is&nbsp;for each of your databases, which survey option is closest to your target maximum allowable downtime SLA (Service-Level [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,35,46,52,91],"tags":[],"class_list":["post-851","post","type-post","status-publish","format-standard","hentry","category-database-maintenance","category-disaster-recovery","category-high-availability","category-involuntary-dba","category-surveys"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Weekly survey: maximum allowable downtime - target and actual - Paul S. 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