MTBF / MTTR - Energized Work TekTalk, Mar 2012

MTBF / MTTR Availability or recoverability? Presented by Michael Richardson, Energized Work 21 March 2012ENERGIZED WORK25 MACKLIN STREETLONDON WC2B 5NN+44 (0)20 7691 8933WWW.ENERGIZEDWORK.COM

Ninesof availability Availability Downtime per Year One nine (90%) 36.5 days Two nines (99%) 3.65 days Three nines (99.9%) 8.76 hours Four nines (99.99%) 52.56 minutes Five nines (99.999%) 5.26 minutes© 2012 Energized Work - www.energizedwork.com 5

Problems witheliminating SPOF•  It’s expensive•  Where do you draw the line?•  Are failures independent?•  Can you guarantee no SPOF?•  Increased complexity© 2012 Energized Work - www.energizedwork.com 12

Hot – Hotmultisite•  Full range of services available in multiple locations•  Easy to automate failover of sites•  Data consistency is hard•  Capacity planning concerns +© 2012 Energized Work - www.energizedwork.com 15

Problemswith multiple sites•  It’s expensive•  Managing more systems•  Managing data consistency•  Managing capacity•  Is it still fail proof?•  Unless you test it, it’s just a plan© 2012 Energized Work - www.energizedwork.com 19

How complex systems fail - Dr. Richard Cook•  Catastrophe is always just around the corner•  Human operators have dual roles•  Change introduces new forms of failure© 2012 Energized Work - www.energizedwork.com 22

RTO / RPOexamplePossible solution:•  Continuously replicate data to second host•  Continue with nightly backups and also copy DB transaction logs from the primary host to another system© 2012 Energized Work - www.energizedwork.com 27

LicenseThis presentation is provided under the Creative Commons Attribution Share Alike 3.0 Unported License. You are free: To share – to copy, distribute and transmit the work To remix – to adapt the work Under the following conditions: Attribution – You must attribute the work in the manner speciﬁed by Energized Work (but not in any way that suggests that Energized Work endorse you or your use of the work). Share Alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one. ENERGIZED WORK 25 MACKLIN STREET LONDON WC2B 5NN +44 (0)20 7691 8933© 2012 Energized Work - www.energizedwork.com WWW.ENERGIZEDWORK.COM 33

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MTBF / MTTR - Energized Work TekTalk, Mar 2012

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