Posted: Sat Apr 25, 2015 8:56 am Post subject: 7 to 8 %
I read it / heard during conferences some where that the average / standard is around 7 to 8%. I personally do not agree with that.
here's my 2 cents:
In order to decide that - review your SLAs and availability agreements. Look at some historic data from incidents and failed changes, that will give you a idea of how well people and technology has performed in the past and also look at the appetite from your senior execs for emergency changes.
Joined: Mar 04, 2008 Posts: 1894 Location: Helensburgh
Posted: Sun Apr 26, 2015 9:32 am Post subject:
I don't believe percentages of such things should be used as overall targets (except perhaps 0% - which is the ideal). And certainly it is meaningless to use other organization's levels and especially "industry levels" or "norms".
Given that you cannot actually eliminate emergencies, their frequency depends on many factors including the innate volatility of your system, the complexity of your system, your business attitude to risk, your "need" or otherwise to use cutting edge technology. Add to that, if you express it as a percentage you are also factoring in the frequency of non-emergency changes (if, say, you have an emergency change on average every three months, it makes a huge difference if you make ten or a hundred other changes during that period - and that is before you have to factor in any cyclical or other variations to the pattern).
I could almost write a book on the problems with this approach. _________________ "Method goes far to prevent trouble in business: for it makes the task easy, hinders confusion, saves abundance of time, and instructs those that have business depending, both what to do and what to hope."
William Penn 1644-1718
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