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Is there any free tool assessment & planning for Server Consolidation, Performance counters in open source or free to use.

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What kind of consolidation are you talking about? I see the tag "virtualization", is this your (main) plan? And if you're planning on virtualization, are you going with VMWare, Microsoft, or else...? –  Massimo Aug 25 '09 at 13:20
    
Basically i'm looking physical server performance whether is over load with services/RAM utilizations and it should work with Microsoft server as well Linux Server both os. –  Rajat Aug 25 '09 at 15:26

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Honestly, every planning tool I've ever seen has been based on Excel.

Typical factors may include:

  • current CPU load per server
  • what's running on each server
  • current hardware of each server
  • expected percentage increase in usage
  • OS usage - homogenous or heterogeneous
  • new hardware or re-use current hardware
  • storage needs
  • vendor for virtualization (VMware, Microsoft, Xen)

And don't forget the all-important:

  • BUDGET

My experience is all related around VMware, but what I've seen and used in the past is the following:

  • look at all CPU utilizations currently
  • add those average and peak percentages in two separate columns
  • plan for ~10% overhead from your hypervisor of choice
  • for every 40% of 'average' or 80% of 'peak', use one server of the type you now consider "high-end"
    • ie, if you have a total of 687% of 'peak', you need 9 physical servers running your hypervisor of choice

Other thoughts:

  • I like to plan for 1 full spare physical server per ~6, so that I can utilize Vmware's Vmotion for migrating servers around
  • plan for buying/utilizing SAN storage of some form so your VMs can be moved to different physical servers easily

I'm sure VARs have all sorts of fancy interfaces or pre-built spreadsheets for this, but they also charge you an arm and a leg to get their advice :)

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