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ITIL :: View topic - Capacity Plan Vs. Availibility Plan
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Capacity Plan Vs. Availibility Plan

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Joined: Jun 25, 2006
Posts: 6

PostPosted: Sun Jul 09, 2006 4:55 pm    Post subject: Capacity Plan Vs. Availibility Plan Reply with quote

if someone help me to find out what these two plans should contain specifically.
1. Capacity Plan - where we ensure all the resources are at the capacity to provide services
2. Availibility Plan - as far as I understand this plan contains the availibility of resources to provide services.

please help me understand what is the basic difference between these two.
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Joined: Aug 31, 2005
Posts: 550
Location: UK

PostPosted: Mon Jul 10, 2006 1:57 am    Post subject: Reply with quote

The Capacity Plan shows how the capacity requirements will be met over the coming period (1-2 years). This takes account of ex[ansion/contraction plans of the business, as well as the technical capacity constraints of indiviual CIs. It shows when additional capacity should be bought (thus allowing it to be budgetted for).
The Availability Plan shows how the Availability commitments in the SLAs will be met. This takes account of eliminating single points of failure, building in resilience, ensuring that the equipment bought is reliable, easily maintained etc. It shows how the balance between MTBF and MTTR is made. (It is perhaps better to have a shorter Mean Time Between Failure, if the device has a short Mean Time to Repair, than a more reliable item which takes days to recover.) The Plan shows the risks to Availability, and the counter-measures required, such as buying UPS/generators in case of power cuts. Availability would work with capacity (unless both roles are combined) to ensure that insufficient Capacity is not a risk to Availablit.
Hope this helps!
Liz Gallacher,
Accredited ITIL and ISO/IEC20000 Trainer and Consultant - Freelance
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