Re: Too hard, too frequent, too unreliable
" We were sold this package on the basis of 99.999% uptime."
And there's the flaw in the thinking. Start thinking in terms of useful availability and downtime. You're trying to manage for minimum loss of useful availability due to downtime. If downtime isn't planned - you had a hardware failure, you got hacked, whatever - then there's no guarantee of it falling into a time of minimum usage. Planned downtime can be arranged fro when it will have minimum impact and its purpose is to minimise the risk of unplanned downtime. But risk is harder to measure than uptime.
Biting the hand that feeds IT
